DTC P0122 [MZR-CD (RF Turbo)]

BME010200100W31

DTC P0122

Accelerator position sensor No.1 circuit low 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 below 0.3 V, PCM determines accelerator position sensor No.1 circuit low input.

POSSIBLE CAUSE

• Accelerator position sensor No.1 malfunction
• Connector or terminal malfunction
• Open circuit in wiring between accelerator position sensor terminal A and PCM terminal 90
• Short to GND in wiring between accelerator position sensor terminal B and PCM terminal 10
• Accelerator position sensor No.1 signal and GND circuits short each other
• 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 8.
No
Go to next step.
3
INSPECT ACCELERATOR POSITION SENSOR NO.1 POWER CIRCUIT FOR OPEN
• Turn engine switch to ON. (Engine OFF)
• Inspect voltage at accelerator position sensor terminal A (harness side).
• Is voltage below 1.0 V?
Yes
Repair or replace harness for open, go to Step 8.
No
Go to next step.
4
INSPECT ACCELERATOR POSITION SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO GND
• Turn engine switch to OFF.
• Inspect continuity between accelerator position sensor terminal B and body GND.
• Is there continuity?
Yes
Repair or replace harness for short to GND, go to Step 8.
No
Go to next step.
5
INSPECT ACCELERATOR POSITION SENSOR NO.1 CIRCUIT FOR SHORT WITH EACH OTHER
• Turn engine switch to OFF.
• Inspect continuity between accelerator position sensor terminals B and D.
• Is there continuity?
Yes
Repair or replace harness for short with each other, go to Step 8.
No
Go to next step.
6
INSPECT ACCELERATOR POSITION SENSOR NO.1
• Inspect accelerator position sensor No.1.
• Is there any malfunction?
Yes
Replace accelerator position sensor, go to Step 8.
No
Go to next step.
7
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 next step.
No
Go to next step.
8
VERIFY TROUBLESHOOTING OF DTC P0122 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.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.