DTC P0121 [AJ (3.0L Duratec)]


id0102a4817200

DTC P0121

TP sensor circuit performance problem

DETECTION CONDITION

• The TP sensor circuit is monitored by the PCM for a non closed throttle position at idle.

POSSIBLE CAUSE

• Accelerator pedal or cable malfunction
• TP sensor malfunction
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME DATA on repair order, then go to next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
VERIFY RELATED PENDING CODE OR STORED DTC
• Verify the related PENDING CODE or stored DTCs.
• Are other DTCs present?
Yes
Go to appropriate DTC inspection.
No
Go to next step.
4
INSPECT ACCELERATOR PEDAL AND CABLE LINKAGE
• Verify that the accelerator pedal and cable are installed correctly.
• Is there any malfunction?
Yes
Reinstalled or replace as necessary, then go to Step 5.
No
Go to next step.
5
INSPECT TP SENSOR
• Inspect the TP sensor.
• Is there any malfunction?
Yes
Replace TP sensor, then go to next step.
No
Go to next step.
6
VERIFY TROUBLESHOOTING OF DTC P0121 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Start engine.
• Perform "KOEO/KOER self-test"
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
7
VERIFY AFTER SERVICE PROCEDURE
• Perform "AFTER SERVICE PROCEDURE".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.