DTC P0123 [MZR-CD (RF Turbo)]

BME010200100W32

DTC P0123

Accelerator position sensor No.1 circuit high input

DETECTION CONDITION

• PCM monitors input voltage from accelerator position sensor No.1 while engine is running. If input voltage from accelerator position sensor No.1 is above 4.7 V, PCM determines accelerator position sensor No.1 circuit high input.

POSSIBLE CAUSE

• Accelerator position sensor No.1 malfunction
• Connector or terminal malfunction
• Accelerator position sensor No.1 power and signal circuits short each other
• Open circuit in wiring between accelerator position sensor terminal B and PCM terminal 10
• Open circuit in wiring between accelerator position sensor terminal D and PCM terminal 91
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform "DTC Confirmation Procedure".
• Is same DTC present during KOEO or KOER self-test?
Yes
Go to next step.
No
Intermittent concern exists. Go to "Intermittent Concern Troubleshooting".
2
INSPECT POOR CONNECTION OF ACCELERATOR POSITION SENSOR NO.1 CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 7.
No
Go to next step.
3
INSPECT ACCELERATOR POSITION SENSOR NO.1 CIRCUIT FOR SHORT EACH OTHER
• Turn engine switch to OFF.
• Inspect continuity between accelerator position sensor terminals A and B
• Is there continuity?
Yes
Repair or replace harness for short each other, go to Step 7.
No
Go to next step.
4
INSPECT ACCELERATOR POSITION SENSOR NO.1
• Inspect accelerator position sensor No.1.
• Is there any malfunction?
Yes
Replace accelerator position sensor, go to Step 7.
No
Go to next step.
5
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 7.
No
Go to next step.
6
INSPECT ACCELERATOR POSITION SENSOR NO.1 CIRCUIT FOR OPEN
• Turn engine switch to OFF.
• Inspect continuity between following harnesses:
- Accelerator position sensor terminal B and PCM terminal 10.
- Accelerator position sensor terminal D and PCM terminal 91.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0123 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is same DTC present?
Yes
Replace PCM, go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.