Code
P1726
DAEWOO
P — Powertrain
Throttle pos input sig miss
Views:
UK: 7
EN: 56
RU: 11
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1726
FORD
P — Powertrain
Insufficient Engine Speed Decrease During Self Test
Views:
UK: 19
EN: 79
RU: 16
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1726
JAGUAR
P — Powertrain
Engine Overspeed
Views:
UK: 18
EN: 79
RU: 17
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1726
LAND ROVER
P — Powertrain
Malfunction of excessive engine speed
Views:
UK: 11
EN: 66
RU: 11
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1726
LINCOLN
P — Powertrain
Insufficient Engine Speed Decrease During Self Test
Views:
UK: 16
EN: 79
RU: 18
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1726
MERCURY
P — Powertrain
Insufficient Engine Speed Decrease During Self Test
Views:
UK: 13
EN: 77
RU: 14
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1726
Other
P — Powertrain
Insufficient Engine Speed Decrease During Self Test
Views:
UK: 15
EN: 79
RU: 16
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1726
SEAT
P — Powertrain
ABS wheel speed signal #4 (left rear) - range/performance
Views:
UK: 7
EN: 55
RU: 7
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1726
VOLKSWAGEN
P — Powertrain
Wheel Speed Signal 4 Range Performance
Views:
UK: 19
EN: 78
RU: 19
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS)
- Open, shorted or damaged wiring between TPS and ECM
- Corroded or loose TPS connector or terminals
- Blown fuse or poor power/ground to TPS
- Intermittent connection due to chafed harness or pin backout
- ECM input circuit fault or internal ECM failure
Symptoms
- Check Engine Light (CEL) illuminated
- Reduced engine power / limp-home mode
- Poor or hesitant acceleration
- Erratic idle or stalling
- No throttle response or unexpected throttle behavior
- Intermittent faults that may come and go
What to check
- Scan for P1726 and any related codes; record freeze-frame and live TPS data
- Visually inspect TPS connector, wiring harness, and nearby harness routing for damage or corrosion
- Check battery voltage and main engine grounds before testing sensors
- Verify TPS reference voltage (typically ~5V) with key ON, engine OFF
- Measure TPS signal voltage at closed throttle and while moving throttle (should change smoothly)
- Backprobe ground at TPS to confirm good chassis/ECM ground
Signal parameters
- Reference voltage to TPS: ~5.0 V (key ON) — must be stable
- Signal voltage (closed throttle): typically ~0.2–1.0 V depending on vehicle
- Signal voltage (wide open throttle): typically ~4.0–4.8 V
- Signal should change smoothly with throttle movement (no jump or dropout)
- Sensor resistance/impedance should match manufacturer spec (often a few kΩ for potentiometer-style TPS)
Diagnostic algorithm
- Retrieve freeze frame and stored codes. Note related codes (pedal position, throttle actuator, communication faults).
- Perform a visual inspection of TPS connector and harness for corrosion, pin damage, or chafing. Repair obvious damage.
- With key ON (engine OFF) backprobe TPS: verify stable 5V reference, good ground, and measure signal voltage at closed throttle.
- Slowly open throttle while monitoring TPS signal voltage or live data on a scan tool. Verify smooth, continuous change without sudden drops or jumps.
- If no signal or out of range, check continuity between TPS signal pin and ECM input pin for open/short to ground or 12V. Repair wiring as needed.
- If wiring and power/ground are good but signal is invalid, replace TPS or throttle body assembly and retest.
- If fault persists after replacement and wiring verified, test ECM input circuit; consider ECM diagnostics or replacement per vehicle service information.
- Clear codes and perform road test to confirm repair. If intermittent, use scope or data logger to capture event under drive conditions.
Likely causes
- Connector corrosion or poor pin contact at TPS
- Broken wire or short to ground/12V in TPS signal circuit
- TPS internal failure (worn potentiometer or sensor electronics)
- Lost 5V reference or ground at TPS
- Aftermarket modifications or damaged harness near throttle body
- Rare: ECM input stage failed
Fault status
Status
Throttle position sensor input signal missing — circuit open/short/intermittent or sensor/ECM fault preventing valid TPS input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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