DTC P0380 [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)]

id0102b0831400

DTC P0380

Glow plug relay circuit malfunction

DETECTION CONDITION

•  The PCM monitors the glow plug relay control signal. If the following conditions are detected, the PCM determines that the glow plug relay circuit has a malfunction.

―  The PCM turns the glow plug relay off but the voltage remains low

―  The PCM turns the glow plug relay on but the voltage remains high

―  The PCM internal driver IC temperature is more than 150 °C {320 °F} when the glow plug relay is on

POSSIBLE CAUSE

•  Glow plug relay malfunction

•  Glow plug malfunction

•  Connector or terminal malfunction

•  Open circuit in wiring harness between glow plug relay terminal 2A and battery

•  Open circuit in wiring harness between glow plug relay terminal 1B and main relay

•  Open circuit in wiring harness between glow plug relay terminal 1A and PCM terminal 182

•  Open circuit in wiring harness between glow plug relay terminal 3A and PCM terminal 227

•  Open circuit in wiring harness between glow plug relay terminal 3A and glow plug terminals

•  Short to ground circuit in wiring harness between glow plug relay terminal 1A and PCM terminal 182

•  Short to ground circuit in wiring harness between glow plug relay terminal 3A and PCM terminal 227

•  Short to ground circuit in wiring harness between glow plug relay terminal 3A and glow plug terminals

•  Short to power supply between glow plug relay terminal 1A and PCM terminal 182

•  Short to power supply between glow plug relay terminal 3A and PCM terminal 227

•  PCM malfunction

DTC P0380	Glow plug relay circuit malfunction
DETECTION CONDITION	• The PCM monitors the glow plug relay control signal. If the following conditions are detected, the PCM determines that the glow plug relay circuit has a malfunction. ― The PCM turns the glow plug relay off but the voltage remains low ― The PCM turns the glow plug relay on but the voltage remains high ― The PCM internal driver IC temperature is more than 150 °C {320 °F} when the glow plug relay is on
POSSIBLE CAUSE	• Glow plug relay malfunction • Glow plug malfunction • Connector or terminal malfunction • Open circuit in wiring harness between glow plug relay terminal 2A and battery • Open circuit in wiring harness between glow plug relay terminal 1B and main relay • Open circuit in wiring harness between glow plug relay terminal 1A and PCM terminal 182 • Open circuit in wiring harness between glow plug relay terminal 3A and PCM terminal 227 • Open circuit in wiring harness between glow plug relay terminal 3A and glow plug terminals • Short to ground circuit in wiring harness between glow plug relay terminal 1A and PCM terminal 182 • Short to ground circuit in wiring harness between glow plug relay terminal 3A and PCM terminal 227 • Short to ground circuit in wiring harness between glow plug relay terminal 3A and glow plug terminals • Short to power supply between glow plug relay terminal 1A and PCM terminal 182 • Short to power supply between glow plug relay terminal 3A and PCM terminal 227 • 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 CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the M-MDS to the DLC-2. • 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	Go to the next step.
3		No	Intermittent concern exists. Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”. (See INTERMITTENT CONCERN TROUBLESHOOTING [WL-C, WE-C].)
4	INSPECT GLOW PLUG RELAY CONNECTOR FOR POOR CONNECTION • Turn the engine switch 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 15.
4		No	Go to the next step.
5	INSPECT GLOW PLUG RELAY POWER SUPPLY FOR OPEN CIRCUIT • Turn the engine switch off. • Measure the voltage between glow plug relay terminal 1B and body ground. • Measure the voltage between glow plug relay terminal 2A and body ground. • Is the voltage B+?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness for an open circuit, then go to Step 15.
6	INSPECT GLOW PLUG RELAY • Inspect the glow plug relay. • Is there any malfunction?	Yes	Go to the next step.
6		No	Replace the glow plug, then go to Step 15.
7	INSPECT GLOW PLUG CONNECTOR FOR POOR CONNECTION • Turn the engine switch 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.
7		No	Go to the next step.
8	INSPECT GLOW PLUG RELAY CIRCUIT FOR SHORT TO GROUND • Turn the engine switch off. • Inspect for continuity between glow plug relay terminal 3A 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 RELAY CIRCUIT FOR OPEN CIRCUIT • Turn the engine switch off. • Inspect for continuity between glow plug relay terminals and glow plug terminals. • 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. (See GLOW PLUG INSPECTION [WL-C, WE-C].) • Is there any malfunction?	Yes	Go to the next step.
10		No	Replace the glow plug, then go to Step 15.
11	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch 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.
11		No	Go to the next step.
12	INSPECT GLOW PLUG RELAY CIRCUIT FOR SHORT TO GROUND • Turn the engine switch off. • Inspect for continuity between glow plug relay terminal 1A and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness for a short to ground, then go to Step 15.
12		No	Go to the next step.
13	INSPECT GLOW PLUG RELAY CIRCUIT FOR SHORT TO POWER SUPPLY • Disconnect the glow plug relay connector and PCM connector. • Turn the engine switch to the ON position (Engine off.) • Inspected the voltage between the following terminals and body ground: ― Glow plug relay terminal 1A (wiring harness-side) and body ground. ― Glow plug relay terminal 3A (wiring harness-side) and body ground. • Is the voltage B+	Yes	Repair or replace the wiring harness for a short to power supply, go to Step 15.
13		No	Go to the next step.
14	INSPECT GLOW PLUG RELAY CIRCUIT FOR OPEN CIRCUIT • Turn the engine switch off. • Inspect for continuity between the following terminals: ― Glow plug relay terminal 1A and PCM terminal 182 ― Glow plug relay terminal 3A and PCM terminal 227 • 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 P0380 TROUBLESHOOTING IS COMPLETED • Turn the engine switch off. • Make sure to reconnect all disconnected connectors. • Turn the engine switch to the ON position (Engine off). • Clear the DTC from the memory using the M-MDS. • Run the vehicle under the FREEZE FRAME DATA stored condition. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [WL-C, WE-C].)
15		No	Go to the next step.
16	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure“. (See AFTER REPAIR PROCEDURE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].)
16		No	DTC troubleshooting completed.