DTC P037D:00 [MZ-CD 1.6]

id0102g8238000

DTC P037D:00

Glow plug control circuit malfunction

DETECTION CONDITION

•  The PCM monitors the glow plug control signal. If there is no response to the feedback signal, the PCM determines that there is a malfunction in the glow plug control circuit.

POSSIBLE CAUSE

•  Glow plug control module malfunction

•  Glow plug malfunction

•  Connector or terminal malfunction

•  Open circuit in wiring harness between glow plug control module terminal A and PCM terminal 3AG

•  Open circuit in wiring harness between glow plug control module terminal C and PCM terminal 2AR

•  Short to ground circuit in wiring harness between glow plug control module terminal A and PCM terminal 3AG

•  Short to ground circuit in wiring harness between glow plug control module terminal C and PCM terminal 2AR

•  Short to power supply in wiring harness between glow plug control module terminal A and PCM terminal 3AG

•  Short to power supply in wiring harness between glow plug control module terminal C and PCM terminal 2AR

•  Open circuit in wiring harness between glow plug control module terminal D and glow plug terminal D

•  Open circuit in wiring harness between glow plug control module terminal F and glow plug terminal C

•  Open circuit in wiring harness between glow plug control module terminal G and glow plug terminal B

•  Open circuit in wiring harness between glow plug control module terminal I and glow plug terminal A

•  Short to ground circuit in wiring harness between glow plug control module terminal D and glow plug terminal D

•  Short to ground circuit in wiring harness between glow plug control module terminal F and glow plug terminal C

•  Short to ground circuit in wiring harness between glow plug control module terminal G and glow plug terminal B

•  Short to ground circuit in wiring harness between glow plug control module terminal I and glow plug terminal A

•  PCM malfunction

DTC P037D:00	Glow plug control circuit malfunction
DETECTION CONDITION	• The PCM monitors the glow plug control signal. If there is no response to the feedback signal, the PCM determines that there is a malfunction in the glow plug control circuit.
POSSIBLE CAUSE	• Glow plug control module malfunction • Glow plug malfunction • Connector or terminal malfunction • Open circuit in wiring harness between glow plug control module terminal A and PCM terminal 3AG • Open circuit in wiring harness between glow plug control module terminal C and PCM terminal 2AR • Short to ground circuit in wiring harness between glow plug control module terminal A and PCM terminal 3AG • Short to ground circuit in wiring harness between glow plug control module terminal C and PCM terminal 2AR • Short to power supply in wiring harness between glow plug control module terminal A and PCM terminal 3AG • Short to power supply in wiring harness between glow plug control module terminal C and PCM terminal 2AR • Open circuit in wiring harness between glow plug control module terminal D and glow plug terminal D • Open circuit in wiring harness between glow plug control module terminal F and glow plug terminal C • Open circuit in wiring harness between glow plug control module terminal G and glow plug terminal B • Open circuit in wiring harness between glow plug control module terminal I and glow plug terminal A • Short to ground circuit in wiring harness between glow plug control module terminal D and glow plug terminal D • Short to ground circuit in wiring harness between glow plug control module terminal F and glow plug terminal C • Short to ground circuit in wiring harness between glow plug control module terminal G and glow plug terminal B • Short to ground circuit in wiring harness between glow plug control module terminal I and glow plug terminal A • 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	INSPECT GLOW PLUG CONTROL MODULE CONNECTOR FOR POOR CONNECTION • Switch the ignition to off. • Disconnect the glow plug control module 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 15.
3		No	Go to the next step.
4	INSPECT GLOW PLUG CONTROL MODULE POWER SUPPLY FOR OPEN CIRCUIT • Switch the ignition to ON (engine off). • Measure the voltage between glow plug control module terminal H and body ground. • Is the voltage B+?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness for an open circuit, then go to Step 15.
5	INSPECT GLOW PLUG CONTROL MODULE • Inspect the glow plug control module. • Is there any malfunction?	Yes	Replace the glow plug control module, then go to Step 15.
5		No	Go to the next step.
6	INSPECT GLOW PLUG CONNECTOR FOR POOR CONNECTION • Switch the ignition to off. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction?	Yes	Repair or replace the suspected terminal, then go to Step 15.
6		No	Go to the next step.
7	INSPECT GLOW PLUG CIRCUIT FOR SHORT TO POWER SUPPLY • Disconnect the glow plug control module connector. • Switch the ignition to ON (engine off). • Measure the voltage between the following terminals: ― Glow plug control module terminal D and ground ― Glow plug control module terminal F and ground ― Glow plug control module terminal G and ground ― Glow plug control module terminal I and ground • Is the voltage B+?	Yes	Repair or replace the wiring harness for a short to power supply, then go to Step 15.
7		No	Go to the next step.
8	INSPECT GLOW PLUG CONTROL MODULE CIRCUIT FOR SHORT TO GROUND • Switch the ignition to off. • Inspect for continuity between the following terminals: ― Glow plug control module terminal D and ground ― Glow plug control module terminal F and ground ― Glow plug control module terminal G and ground ― Glow plug control module terminal I and ground • Is there continuity?	Yes	Repair or replace the wiring harness for a short to ground, then go to Step 15.
8		No	Go to the next step.
9	INSPECT GLOW PLUG CONTROL MODULE CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the following terminals: ― Glow plug control module terminal D and glow plug terminal D ― Glow plug control module terminal F and glow plug terminal C ― Glow plug control module terminal G and glow plug terminal B ― Glow plug control module terminal I and glow plug terminal A • Is there continuity?	Yes	Go to the next step
9		No	Repair or replace the wiring harness for an open circuit, then go to Step 15.
10	INSPECT GLOW PLUG • Inspect the glow plug and glow plug code. • Is there any malfunction?	Yes	Replace the glow plug and/or glow plug code, then go to Step 15.
10		No	Go to the next step.
11	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction?	Yes	Repair or replace the suspected terminal, then go to Step 15.
11		No	Go to the next step.
12	INSPECT GLOW PLUG CONTROL MODULE CIRCUIT FOR SHORT TO POWER SUPPLY • Disconnect the glow plug control module and PCM connector. • Switch the ignition to ON (engine off). • Measure the voltage between the following terminals: ― Glow plug control module terminal A and body ground ― Glow plug control module terminal C and body ground • Is the voltage B+?	Yes	Repair or replace the wiring harness for a short to power supply, then go to Step 15.
12		No	Go to the next step.
13	INSPECT GLOW PLUG CONTROL MODULE CIRCUIT FOR SHORT TO GROUND • Switch the ignition to off. • Inspect for continuity between the following terminals: ― Glow plug control module terminal A and body ground. ― Glow plug control module terminal C and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness for a short to ground, then go to Step 15.
13		No	Go to the next step.
14	INSPECT GLOW PLUG CONTROL MODULE CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the following terminals: ― Glow plug control module terminal A and PCM terminal 3AG ― Glow plug control module terminal C and PCM terminal 2AR • Is there continuity?	Yes	Go to the next step
14		No	Repair or replace the wiring harness for an open circuit, then go to the next step.
15	VERIFY THAT DTC P037D:00 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].) Go to the next step.
15		No	Go to the next step.
16	VERIFY AFTER REPAIR PROCEDURE • Perform the after repair procedure. (See AFTER REPAIR PROCEDURE [MZ-CD 1.6].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZ-CD 1.6].)
16		No	DTC troubleshooting completed.