DTC P0125 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010200100W03

DTC P0125

Excessive time to enter closed loop fuel control

DETECTION CONDITION

• The PCM monitor ECT sensor signal at PCM terminal 41 after engine is started at the engine is cold. If ECT voltage does not reach the expected temperature for specified period, PCM determines that it has taken an excessive amount of time for the engine coolant temperature to reach the temperature necessary to start closed-loop fuel control.
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.
• DTC is stored in PCM memory.

POSSIBLE CAUSE

• ECT sensor malfunction
• Poor connection of connectors
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Engine cooling system related) been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the 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 CURRENT INPUT SIGNAL STATUS-IS CONCERN INTERMITTENT OR CONSTANT
• Start engine.
• Warm up engine completely.
• Access ECT PID using WDS or equivalent.
• Is ECT PID above 60 °C {140 °F}?
Yes
Intermittent concern exists. Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure.
No
Go to next step.
4
INSPECT ECT SENSOR CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect ECT 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 7.
No
Go to next step.
5
INSPECT ECT SENSOR
• Inspect ECT sensor.
• Is it normal?
Yes
Go to next step.
No
Replace ECT sensor, then go to Step 7.
6
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Are there any malfunctions?
Yes
Repair or replace terminal, then go to next step.
No
Go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0125 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Turn the ignition switch to ON (Engine OFF).
• Access ECT PID using WDS or equivalent.
• Wait until ECT PID below 20 °C {68 °F}.
• Start engine and warm it up completely.
• Is PENDING CODE of same DTC stored?
Yes
Replace PCM, then go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.