DTC P0125:00 [MZR 1.6]

DTC P0125:00	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 check engine light 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 (Mode 2)/Snapshot data is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Cooling system malfunction • ECT sensor connector or terminals malfunction • ECT sensor malfunction • PCM connector or terminals malfunction • PCM malfunction

DTC P0125:00

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 check engine light 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 (Mode 2)/Snapshot data is available.

• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Cooling system malfunction

• ECT sensor connector or terminals malfunction

• ECT sensor malfunction

• PCM connector or terminals malfunction

• PCM malfunction

STEP	INSPECTION	ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (engine cooling system related) been recorded?	Yes	Go to the next step.
No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
3	VERIFY CURRENT INPUT SIGNAL STATUS • Connect the M-MDS to the DLC-2. • Start the engine and warm it up completely. • Perform the PID/DATA Monitor and Record Procedure and access the ECT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) • Is the ECT PID more than 70 °C {158 °F}?	Yes	Intermittent concern exists. • Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”. (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR 1.6].)
No	Go to the next step.
4	INSPECT ECT SENSOR CONNECTOR CONDITION • Switch the ignition 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 connector or terminals, then go to Step 7.
No	Go to the next step.
5	INSPECT ECT SENSOR • Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Replace the ECT sensor, then go to Step 7. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)
No	Go to the next step.
6	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to the next step.
No	Go to the next step.
7	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 1.6].) • Perform the PID/DATA Monitor and Record Procedure and access the ECT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) • Wait until the ECT PID is less than 20 °C {68 °F}. • Start the engine and warm it up completely. • Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) • Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.6].) Go to the next step.
No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 1.6].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.6].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED

• Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (engine cooling system related) been recorded?

Yes

Go to the next step.

Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.

VERIFY RELATED SERVICE INFORMATION AVAILABILITY

• Verify related Service Information availability.

• Is any related Service Information available?

Yes

Perform repair or diagnosis according to the available Service Information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

VERIFY CURRENT INPUT SIGNAL STATUS

• Connect the M-MDS to the DLC-2.

• Start the engine and warm it up completely.

• Perform the PID/DATA Monitor and Record Procedure and access the ECT PID using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

• Is the ECT PID more than 70 °C {158 °F}?

Yes

Intermittent concern exists.

• Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.

(See INTERMITTENT CONCERN TROUBLESHOOTING [MZR 1.6].)

Go to the next step.

INSPECT ECT SENSOR CONNECTOR CONDITION

• Switch the ignition 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 connector or terminals, then go to Step 7.

Go to the next step.

INSPECT ECT SENSOR

• Inspect the ECT sensor.

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 1.6].)

• Is there any malfunction?

Yes

Replace the ECT sensor, then go to Step 7.

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)

Go to the next step.

INSPECT PCM CONNECTOR CONDITION

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector or terminals, then go to the next step.

Go to the next step.

VERIFY DTC TROUBLESHOOTING COMPLETED

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

(See AFTER REPAIR PROCEDURE [MZR 1.6].)

• Perform the PID/DATA Monitor and Record Procedure and access the ECT PID using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

• Wait until the ECT PID is less than 20 °C {68 °F}.

• Start the engine and warm it up completely.

• Perform the Pending Trouble Code Access Procedure.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

• Is the PENDING CODE for this DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

(See PCM REMOVAL/INSTALLATION [MZR 1.6].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(See AFTER REPAIR PROCEDURE [MZR 1.6].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 1.6].)

DTC troubleshooting completed.