DTC P0670:00 [MZ-CD 1.6]

id0102g8067000

DTC P0670:00

Glow plug control circuit open

DETECTION CONDITION

•  The PCM monitors the glow plug control signal. If there is a open circuit in the glow plug control circuit, 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 the wiring harness between glow plug control module terminal A and PCM terminal 3AG

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

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

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

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

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

•  PCM malfunction

DTC P0670:00	Glow plug control circuit open
DETECTION CONDITION	• The PCM monitors the glow plug control signal. If there is a open circuit in the glow plug control circuit, 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 the wiring harness between glow plug control module terminal A and PCM terminal 3AG • Open circuit in the wiring harness between glow plug control module terminal C and PCM terminal 2AR • Open circuit in the wiring harness between glow plug control module terminal D and glow plug terminal D • Open circuit in the wiring harness between glow plug control module terminal F and glow plug terminal C • Open circuit in the wiring harness between glow plug control module terminal G and glow plug terminal B • Open circuit in the 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 • Disconnect the glow plug control module connector. • Switch the ignition to ON (engine off). • 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 10.
3		No	Go to the next step.
4	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 10.
4		No	Go to the next step.
5	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 10.
5		No	Go to the next step.
6	INSPECT GLOW PLUG CONTROL MODULE CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the following terminals: ― glow plug control module terminal B and ground ― 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	Repair or replace the wiring harness for a open circuit, then go to Step 10.
6		No	Go to the next step.
7	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 10.
7		No	Go to the next step.
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Switch the ignition to off. • 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 10.
8		No	Go to the next step.
9	INSPECT GLOW PLUG CONTROL MODULE CIRCUIT FOR SHORT TO GROUND • 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	Repair or replace the wiring harness for a short to ground, then go to the next step.
9		No	Go to the next step.
10	VERIFY THAT DTC P0670:00 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.
10		No	Go to the next step.
11	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].)
11		No	DTC troubleshooting completed.