DTC P0125


BHE010200100W13

DTC P0125

Insufficient coolant temperature for closed loop fuel control

DETECTION CONDITION

• The PCM monitors the ECT after cold engine start. If the ECT does not reach the specification in a certain period, the PCM determines that the coolant temperature for closed loop fuel control is insufficient.

Diagnostic support note

• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• ECT 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 the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Verify related service repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3

VERIFY CURRENT INPUT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?

• Connect the WDS or equivalent to the DLC-2.
• Start the engine and warm it up completely.
• Access the ECT PID.
• Is the ECT PID more than 70 °C {158 °F}?
Yes
Intermittent concern exists.
Perform the "INTERMITTENT CONCERNS TROUBLESHOOTING".
No
Go to the next step.
4

INSPECT ECT SENSOR

• Inspect the ECT sensor.
• Is there any malfunction?
Yes
Replace the ECT sensor, then go to Step 6.
No
Go to the next step.
5

INSPECT MAF SENSOR

• Inspect the MAF sensor.
• Is there any malfunction?
Yes
Replace the MAF/IAT sensor, then go to the next step.
No
Go to the next step.
6

VERIFY TROUBLESHOOTING OF DTC P0125 COMPLETED

• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Access the ECT PID.
• Wait until the ECT PID less than 20 °C {68 °F}.
• Start the engine and warm it up completely.
• Is the PENDING CODE same as the DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
7

VERIFY AFTER REPAIR PROCEDURE

• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE.)
No
DTC troubleshooting completed.