DTC P138A [MZ-CD 1.6 (Y6) (EURO4 emission level)]

id0102g6836800

DTC P138A

Glow plug relay control circuit range/performance

DETECTION CONDITION

•  The PCM monitors the glow plug control circuit signal. If the glow plug relay temperature becomes excessive, the PCM determines that the glow plug control circuit system has a malfunction.

POSSIBLE CAUSE

•  Glow plug relay connector or terminal malfunction

•  Glow plug relay malfunction

•  PCM connector or terminal malfunction

•  Open circuit in wiring harness between glow plug relay terminal B and PCM terminal 210

•  PCM malfunction

DTC P138A	Glow plug relay control circuit range/performance
DETECTION CONDITION	• The PCM monitors the glow plug control circuit signal. If the glow plug relay temperature becomes excessive, the PCM determines that the glow plug control circuit system has a malfunction.
POSSIBLE CAUSE	• Glow plug relay connector or terminal malfunction • Glow plug relay malfunction • PCM connector or terminal malfunction • Open circuit in wiring harness between glow plug relay terminal B and PCM terminal 210 • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		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.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND/OR DTC • Switch the ignition to ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [MZ-CD 1.6 (Y6) (EURO4 emission level)].) • Is the other PENDING CODE/DTC also present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
3		No	Go to the next step.
4	INSPECT GLOW PLUG RELAY CONNECTOR CONNECTION • Switch the ignition to off. • Disconnect the glow plug relay 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 8.
4		No	Go to the next step.
5	INSPECT GLOW PLUG RELAY • Inspect the glow plug relay. (See RELAY INSPECTION.) • Is there any malfunction?	Yes	Replace the glow plug relay, then go to Step 8.
5		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 and/or terminals, then go to Step 8.
6		No	Go to the next step.
7	INSPECT GLOW PLUG RELAY CIRCUIT FOR OPEN CIRCUIT • Switch the ignition to OFF. • Inspect for continuity between glow plug relay terminal B and PCM terminal 210 (wiring harness-side) • Is there continuity?	Yes	Go to the next step
7		No	Repair or replace the wiring harness for an open circuit, then go to the next step.
8	VERIFY THAT DTC P138A TROUBLESHOOTING IS COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Run the vehicle under the FREEZE FRAME DATA stored condition. • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6) (EURO4 emission level)].) Go to the next step.
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the after repair procedure. (See AFTER REPAIR PROCEDURE [MZ-CD 1.6 (Y6) (EURO4 emission level)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
9		No	DTC troubleshooting completed.