Code
P1703
ALFA ROMEO
P — Powertrain
Engine shutdown signal from automatic gearbox | Manual position switch fault
Views:
UK: 3
EN: 8
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
DAEWOO
P — Powertrain
Tps -open/ground
Views:
UK: 2
EN: 7
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
DAIHATSU
P — Powertrain
Lock-up speed disagreement
Views:
UK: 2
EN: 5
RU: 2
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
FIAT
P — Powertrain
Engine shutdown signal from automatic gearbox | Manual position switch fault
Views:
UK: 3
EN: 8
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
FORD
P — Powertrain
Brake On Off Switch Out of Self-Test Range
Views:
UK: 17
EN: 37
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
LAND ROVER
P — Powertrain
Brake change to outside of the self-test rows
Views:
UK: 3
EN: 9
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
LINCOLN
P — Powertrain
Brake On Off Switch Out of Self-Test Range
Views:
UK: 18
EN: 85
RU: 27
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
MAZDA
P — Powertrain
Brake On Off Switch Out Of Self Test Range
Views:
UK: 17
EN: 41
RU: 24
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
MERCURY
P — Powertrain
Brake On Off Switch Out of Self-Test Range
Views:
UK: 15
EN: 41
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
OPEL
P — Powertrain
Brake Light Switch Signal CAN-Bus Malfunction
Views:
UK: 3
EN: 8
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
Other
P — Powertrain
Brake Switch Out Of Self Test Range
Views:
UK: 16
EN: 39
RU: 20
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop ManualAudi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop ManualAUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop ManualAudi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop ManualAudi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop ManualAudi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop ManualAudi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop ManualAudi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop ManualAudi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop ManualAudi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop ManualAudi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop ManualLAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1703
SUBARU
P — Powertrain
Low Clutch Timing Control Solenoid Valve Circuit Malfunction
Views:
UK: 18
EN: 40
RU: 20
AI status
Completed
Completed
100%
Causes
- Faulty manual position (gear selector) switch inside gearbox or selector assembly
- Open, short or intermittent wiring between switch and PCM/TCM
- Corroded, loose or damaged connector pins at gearbox or control module
- Loss of reference voltage or ground to the switch circuit
- Failed Transmission Control Module (TCM) or engine control module (PCM/ECU)
- Blown fuse or power supply problem for transmission electronics
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Intermittent or immediate engine shutdown commanded during/after shifting
- Vehicle enters limp or restricted mode; limited gears available
- Incorrect or no gear indication on instrument cluster
- No-crank or no-start in some selector positions
- Erratic shifting or inability to select gears
What to check
- Read and record freeze-frame data and full stored/ pending codes with a capable scan tool (check both ECU and TCM)
- Observe live data for manual position / gear selector signal while moving shifter through all positions
- Inspect gearbox and harness connectors for corrosion, bent pins, water ingress or damage
- Check relevant fuses and power supplies for transmission control circuits
- Back-probe switch connector and measure voltage/continuity while operating selector
- Wiggle wiring harness while monitoring live data to detect intermittent faults
Signal parameters
- Type: discrete switched circuit or digital CAN message (vehicle-dependent)
- Expected discrete logic: typical 0–1 V = LOW, 4–5 V = HIGH (or switched to chassis ground or +12 V depending on design)
- When closed: near 0 Ω continuity between switch terminals; when open: infinite resistance
- Reference power: typically ignition-switched +12 V or 5 V reference to switch and a ground return to ECU/TCM
- Update rate: discrete switch changes on gear change; CAN messages typically 5–20 Hz (scan tool will show live values)
- Use a digital multimeter for basic checks; use an oscilloscope for intermittent or noisy signals
Diagnostic algorithm
- Retrieve all stored codes (ECU and TCM) and note freeze frame/live data related to transmission and engine shutdown.
- Confirm symptom: replicate by moving shifter through positions while monitoring live data for manual position and any engine shutdown request flags.
- Visually inspect connectors at gearbox/selector and PCM/TCM for corrosion, damage or water ingress. Repair or clean as needed.
- Check fuses and power supplies for transmission electronics. Verify ignition-switched +12 V and any 5 V reference present at the switch connector.
- Back-probe the manual position switch connector. Measure reference voltage, signal voltage and ground continuity while moving selector through positions. Compare against expected logic (see signal_params).
- Check continuity from switch connector to PCM/TCM pins. Look for shorts to battery, ground, or other circuits. Repair wiring harness as required.
- If voltages and continuity are correct but signal is incorrect intermittently, wiggle test harness and connectors to try to reproduce fault. Use an oscilloscope to inspect signal shape for noise or dropouts.
- If the discrete switch is faulty, replace the manual position/selector switch or selector assembly per manufacturer procedure.
- If wiring and switch test good, check CAN bus messages for gearbox status. If TCM not sending expected messages, investigate TCM power/ground and communication lines.
- After repairs, clear codes, perform a full system relearn if required by manufacturer, and road test to verify the fault does not return.
- If tests point to module failure, confirm with module bench test or replacement and recheck functionality.
Likely causes
- Wiring harness damage or poor connector (most common)
- Defective manual position/gear selector switch
- Lost reference voltage or bad ground to the switch circuit
- Faulty TCM or ECU (less common after wiring/switch checks)
Fault status
Status
Engine shutdown signal from gearbox / Manual position switch fault detected. Transmission selector signal missing or invalid; control module may prevent engine operation or enter limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email