DTC P1121 [AJ (3.0L Duratec)]

id0102a4822700

DTC P1121

TP sensor inconsistent with MAP sensor

DETECTION CONDITION

• The PCM compares the actual input signal from the MAF sensor with the expected input signal from the MAF sensor which the PCM calculates by the input voltage from the throttle position sensor or engine speed.

POSSIBLE CAUSE

• TP sensor malfunction
• MAF 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 OTHER DTC PRESENT
• Is DTC P0102, P0103, P0122, or P0123 present?
Yes
Go to applicable DTC inspection.
No
Go to next step.
4
INSPECT MAF SENSOR
• Inspect the MAF sensor.
• Is there any malfunction?
Yes
Replace MAF sensor, then go to next step.
No
Go to next step.
5
INSPECT TP SENSOR
• Inspect the TP sensor.
• Is there any malfunction?
Yes
Replace the TP sensor, then go to next step.
No
Go to next step.
6
VERIFY TROUBLESHOOTING OF DTC P1121 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 PRECAUTION
• Perform "AFTER SERVICE PRECAUTION".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.