DTC P1112 [YF (2.0L Zetec)]

id0102d0822300

DTC P1112

IAT circuit performance problem

DETECTION CONDITION

• Indicates IAT sensor signal was intermittent.

POSSIBLE CAUSE

• IAT sensor malfunction
• Poor connection at MAF/IAT sensor or PCM connector
• 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
INSPECT MAF/IAT SENSOR CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Disconnect MAF/IAT sensor connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Are there any malfunctions?
Yes
Repair or replace terminal, then go to Step 6.
No
Go to next step.
4
INSPECT IAT SENSOR
• Inspect IAT sensor.
• Is IAT sensor normal?
Yes
Replace MAF/IAT sensor, then go to Step 6.
No
Go to next step.
5
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Are there any malfunction?
Yes
Repair or replace terminal, then go to Step 6.
No
Go to next step.
6
VERIFY TROUBLESHOOTING OF DTC P1112 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Start engine and run engine under FREEZE FRAME DATA condition.
• Is PENDING CODE of same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.