DTC P0125 [ZY]

id0102d3804400

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 engine coolant temperature for closed loop fuel control is insufficient.
Diagnostic support note
• This is a continuous monitor (Engine cooling system).
• 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
• Cooling system malfunction
• Poor connection of 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 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
• Start the engine.
• Warm up the engine completely.
• Access ECT PID using the WDS or equivalent.
• Is ECT PID above 70 °C {158 °F}?
Yes
Intermittent concern exists. Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure.
No
Go to the next step.
4
INSPECT POOR CONNECTION OF ECT SENSOR CONNECTOR
• Turn the ignition switch off.
• Disconnect the ECT sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion.)
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 7.
No
Go to the next step.
5
INSPECT ECT SENSOR
• Inspect the ECT sensor.
• Is it normal?
Yes
Go to the next step.
No
Replace the ECT sensor, then go to Step 7.
6
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion.)
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to the next step.
7
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 is less than 20 °C {68 °F}.
• Start the engine and warm it up completely.
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.