Code
P1146
DAEWOO
P — Powertrain
IDLE CO POTENTIOMET
Views:
UK: 2
EN: 5
RU: 1
AI status
Completed
Completed
100%
Causes
- Faulty idle CO/idle potentiometer (worn or internally open/shorted)
- Damaged, corroded or loose connector or wiring (open, short to power or ground, high resistance)
- Poor sensor ground or reference voltage loss
- Throttle body contamination or mechanical sticking affecting sensor movement
- Vacuum leaks or other intake air problems altering idle behavior
- ECM or software fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated with P1146 stored
- Irregular, high or low idle speed or idle hunting
- Hard starting or rough idle after cold start
- Reduced engine performance at idle or hesitation
- Throttle response may be inconsistent
What to check
- Scan for codes and freeze-frame data; note RPM, engine load, coolant temp when fault set
- Visually inspect sensor connector and wiring for corrosion, damage or looseness
- Perform wiggle test on harness while monitoring live data to reproduce fault/intermittency
- Inspect throttle body for carbon build-up and ensure throttle plate moves freely
- Check for vacuum leaks (hoses, intake manifold gaskets)
- Measure reference voltage and ground at sensor connector with key ON, engine OFF
Signal parameters
- Reference voltage (typical): 5.0 V ±0.2 V at sensor reference pin
- Sensor signal voltage (typical idle range): approximately 0.5–4.5 V; should change smoothly with throttle movement
- Sensor output should not be open (no voltage) or shorted to battery/ground
- Resistance (if specified by manufacturer) should vary smoothly across potentiometer sweep without dead spots
Diagnostic algorithm
- Connect scan tool; read freeze frame and pending codes; note conditions when P1146 set
- Visually inspect sensor connector, wiring and grounds; repair any corrosion or damaged wiring
- With ignition ON (engine OFF) measure reference voltage and ground at sensor connector; if no 5 V reference or poor ground, trace to ECU and repair
- Back-probe sensor signal with key ON and slowly move throttle or idle adjusting mechanism; observe signal voltage on scan tool or DVOM — it should vary smoothly without jumps or dropouts
- If signal is intermittent or out-of-range, unplug connector and measure resistance of potentiometer (if service manual specifies values) or replace sensor/throttle body assembly
- Clean throttle body and ensure throttle plate moves freely if binding is present, then retest sensor output
- After repair or replacement clear codes, perform idle relearn/adaptation if required by the manufacturer, then road test and verify code does not return
Likely causes
- Worn or contaminated potentiometer inside throttle/idle assembly
- Corroded connector or broken wire at sensor
- Poor ground at sensor or ECU
- Throttle body dirt causing abnormal sensor readings
Fault status
Status
ECM detected invalid or out-of-range signal from idle CO potentiometer (idle control potentiometer). Code P1146 stored.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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
P1146
LAND ROVER
P — Powertrain
Low input from generator line C
Views:
UK: 4
EN: 9
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty idle CO/idle potentiometer (worn or internally open/shorted)
- Damaged, corroded or loose connector or wiring (open, short to power or ground, high resistance)
- Poor sensor ground or reference voltage loss
- Throttle body contamination or mechanical sticking affecting sensor movement
- Vacuum leaks or other intake air problems altering idle behavior
- ECM or software fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated with P1146 stored
- Irregular, high or low idle speed or idle hunting
- Hard starting or rough idle after cold start
- Reduced engine performance at idle or hesitation
- Throttle response may be inconsistent
What to check
- Scan for codes and freeze-frame data; note RPM, engine load, coolant temp when fault set
- Visually inspect sensor connector and wiring for corrosion, damage or looseness
- Perform wiggle test on harness while monitoring live data to reproduce fault/intermittency
- Inspect throttle body for carbon build-up and ensure throttle plate moves freely
- Check for vacuum leaks (hoses, intake manifold gaskets)
- Measure reference voltage and ground at sensor connector with key ON, engine OFF
Signal parameters
- Reference voltage (typical): 5.0 V ±0.2 V at sensor reference pin
- Sensor signal voltage (typical idle range): approximately 0.5–4.5 V; should change smoothly with throttle movement
- Sensor output should not be open (no voltage) or shorted to battery/ground
- Resistance (if specified by manufacturer) should vary smoothly across potentiometer sweep without dead spots
Diagnostic algorithm
- Connect scan tool; read freeze frame and pending codes; note conditions when P1146 set
- Visually inspect sensor connector, wiring and grounds; repair any corrosion or damaged wiring
- With ignition ON (engine OFF) measure reference voltage and ground at sensor connector; if no 5 V reference or poor ground, trace to ECU and repair
- Back-probe sensor signal with key ON and slowly move throttle or idle adjusting mechanism; observe signal voltage on scan tool or DVOM — it should vary smoothly without jumps or dropouts
- If signal is intermittent or out-of-range, unplug connector and measure resistance of potentiometer (if service manual specifies values) or replace sensor/throttle body assembly
- Clean throttle body and ensure throttle plate moves freely if binding is present, then retest sensor output
- After repair or replacement clear codes, perform idle relearn/adaptation if required by the manufacturer, then road test and verify code does not return
Likely causes
- Worn or contaminated potentiometer inside throttle/idle assembly
- Corroded connector or broken wire at sensor
- Poor ground at sensor or ECU
- Throttle body dirt causing abnormal sensor readings
Fault status
Status
ECM detected invalid or out-of-range signal from idle CO potentiometer (idle control potentiometer). Code P1146 stored.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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
P1146
RAM
P — Powertrain
Fuel Injector Group 1 Supply Voltage Circuit
Views:
UK: 2
EN: 5
RU: 1
AI status
Completed
Completed
100%
Causes
- Faulty idle CO/idle potentiometer (worn or internally open/shorted)
- Damaged, corroded or loose connector or wiring (open, short to power or ground, high resistance)
- Poor sensor ground or reference voltage loss
- Throttle body contamination or mechanical sticking affecting sensor movement
- Vacuum leaks or other intake air problems altering idle behavior
- ECM or software fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated with P1146 stored
- Irregular, high or low idle speed or idle hunting
- Hard starting or rough idle after cold start
- Reduced engine performance at idle or hesitation
- Throttle response may be inconsistent
What to check
- Scan for codes and freeze-frame data; note RPM, engine load, coolant temp when fault set
- Visually inspect sensor connector and wiring for corrosion, damage or looseness
- Perform wiggle test on harness while monitoring live data to reproduce fault/intermittency
- Inspect throttle body for carbon build-up and ensure throttle plate moves freely
- Check for vacuum leaks (hoses, intake manifold gaskets)
- Measure reference voltage and ground at sensor connector with key ON, engine OFF
Signal parameters
- Reference voltage (typical): 5.0 V ±0.2 V at sensor reference pin
- Sensor signal voltage (typical idle range): approximately 0.5–4.5 V; should change smoothly with throttle movement
- Sensor output should not be open (no voltage) or shorted to battery/ground
- Resistance (if specified by manufacturer) should vary smoothly across potentiometer sweep without dead spots
Diagnostic algorithm
- Connect scan tool; read freeze frame and pending codes; note conditions when P1146 set
- Visually inspect sensor connector, wiring and grounds; repair any corrosion or damaged wiring
- With ignition ON (engine OFF) measure reference voltage and ground at sensor connector; if no 5 V reference or poor ground, trace to ECU and repair
- Back-probe sensor signal with key ON and slowly move throttle or idle adjusting mechanism; observe signal voltage on scan tool or DVOM — it should vary smoothly without jumps or dropouts
- If signal is intermittent or out-of-range, unplug connector and measure resistance of potentiometer (if service manual specifies values) or replace sensor/throttle body assembly
- Clean throttle body and ensure throttle plate moves freely if binding is present, then retest sensor output
- After repair or replacement clear codes, perform idle relearn/adaptation if required by the manufacturer, then road test and verify code does not return
Likely causes
- Worn or contaminated potentiometer inside throttle/idle assembly
- Corroded connector or broken wire at sensor
- Poor ground at sensor or ECU
- Throttle body dirt causing abnormal sensor readings
Fault status
Status
ECM detected invalid or out-of-range signal from idle CO potentiometer (idle control potentiometer). Code P1146 stored.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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
P1146
SUBARU
P — Powertrain
Pressure Sensor Circuit Range Performance Problem High Input
Views:
UK: 8
EN: 19
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty idle CO/idle potentiometer (worn or internally open/shorted)
- Damaged, corroded or loose connector or wiring (open, short to power or ground, high resistance)
- Poor sensor ground or reference voltage loss
- Throttle body contamination or mechanical sticking affecting sensor movement
- Vacuum leaks or other intake air problems altering idle behavior
- ECM or software fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated with P1146 stored
- Irregular, high or low idle speed or idle hunting
- Hard starting or rough idle after cold start
- Reduced engine performance at idle or hesitation
- Throttle response may be inconsistent
What to check
- Scan for codes and freeze-frame data; note RPM, engine load, coolant temp when fault set
- Visually inspect sensor connector and wiring for corrosion, damage or looseness
- Perform wiggle test on harness while monitoring live data to reproduce fault/intermittency
- Inspect throttle body for carbon build-up and ensure throttle plate moves freely
- Check for vacuum leaks (hoses, intake manifold gaskets)
- Measure reference voltage and ground at sensor connector with key ON, engine OFF
Signal parameters
- Reference voltage (typical): 5.0 V ±0.2 V at sensor reference pin
- Sensor signal voltage (typical idle range): approximately 0.5–4.5 V; should change smoothly with throttle movement
- Sensor output should not be open (no voltage) or shorted to battery/ground
- Resistance (if specified by manufacturer) should vary smoothly across potentiometer sweep without dead spots
Diagnostic algorithm
- Connect scan tool; read freeze frame and pending codes; note conditions when P1146 set
- Visually inspect sensor connector, wiring and grounds; repair any corrosion or damaged wiring
- With ignition ON (engine OFF) measure reference voltage and ground at sensor connector; if no 5 V reference or poor ground, trace to ECU and repair
- Back-probe sensor signal with key ON and slowly move throttle or idle adjusting mechanism; observe signal voltage on scan tool or DVOM — it should vary smoothly without jumps or dropouts
- If signal is intermittent or out-of-range, unplug connector and measure resistance of potentiometer (if service manual specifies values) or replace sensor/throttle body assembly
- Clean throttle body and ensure throttle plate moves freely if binding is present, then retest sensor output
- After repair or replacement clear codes, perform idle relearn/adaptation if required by the manufacturer, then road test and verify code does not return
Likely causes
- Worn or contaminated potentiometer inside throttle/idle assembly
- Corroded connector or broken wire at sensor
- Poor ground at sensor or ECU
- Throttle body dirt causing abnormal sensor readings
Fault status
Status
ECM detected invalid or out-of-range signal from idle CO potentiometer (idle control potentiometer). Code P1146 stored.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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
P1146
VOLKSWAGEN
P — Powertrain
Mass Or Volume Air Flow Circuit Power Supply Malfunction
Views:
UK: 10
EN: 19
RU: 14
AI status
Completed
Completed
100%
Causes
- Faulty idle CO/idle potentiometer (worn or internally open/shorted)
- Damaged, corroded or loose connector or wiring (open, short to power or ground, high resistance)
- Poor sensor ground or reference voltage loss
- Throttle body contamination or mechanical sticking affecting sensor movement
- Vacuum leaks or other intake air problems altering idle behavior
- ECM or software fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated with P1146 stored
- Irregular, high or low idle speed or idle hunting
- Hard starting or rough idle after cold start
- Reduced engine performance at idle or hesitation
- Throttle response may be inconsistent
What to check
- Scan for codes and freeze-frame data; note RPM, engine load, coolant temp when fault set
- Visually inspect sensor connector and wiring for corrosion, damage or looseness
- Perform wiggle test on harness while monitoring live data to reproduce fault/intermittency
- Inspect throttle body for carbon build-up and ensure throttle plate moves freely
- Check for vacuum leaks (hoses, intake manifold gaskets)
- Measure reference voltage and ground at sensor connector with key ON, engine OFF
Signal parameters
- Reference voltage (typical): 5.0 V ±0.2 V at sensor reference pin
- Sensor signal voltage (typical idle range): approximately 0.5–4.5 V; should change smoothly with throttle movement
- Sensor output should not be open (no voltage) or shorted to battery/ground
- Resistance (if specified by manufacturer) should vary smoothly across potentiometer sweep without dead spots
Diagnostic algorithm
- Connect scan tool; read freeze frame and pending codes; note conditions when P1146 set
- Visually inspect sensor connector, wiring and grounds; repair any corrosion or damaged wiring
- With ignition ON (engine OFF) measure reference voltage and ground at sensor connector; if no 5 V reference or poor ground, trace to ECU and repair
- Back-probe sensor signal with key ON and slowly move throttle or idle adjusting mechanism; observe signal voltage on scan tool or DVOM — it should vary smoothly without jumps or dropouts
- If signal is intermittent or out-of-range, unplug connector and measure resistance of potentiometer (if service manual specifies values) or replace sensor/throttle body assembly
- Clean throttle body and ensure throttle plate moves freely if binding is present, then retest sensor output
- After repair or replacement clear codes, perform idle relearn/adaptation if required by the manufacturer, then road test and verify code does not return
Likely causes
- Worn or contaminated potentiometer inside throttle/idle assembly
- Corroded connector or broken wire at sensor
- Poor ground at sensor or ECU
- Throttle body dirt causing abnormal sensor readings
Fault status
Status
ECM detected invalid or out-of-range signal from idle CO potentiometer (idle control potentiometer). Code P1146 stored.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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