DTC P0380 [MZR-CD (RF Turbo)]

BME010200300W12

DTC P0380

Glow plug relay circuit malfunction

DETECTION CONDITION

• PCM monitors input voltage from glow plug relay while engine is running. PCM determines glow plug relay circuit malfunction if input voltage from glow plug relay is as following:

- 1.0 V or below when glow plug relay is on.

- 4.0 V or above when glow plug relay is off.

POSSIBLE CAUSE

• Glow plug relay malfunction
• Connector or terminal malfunction
• Short to GND in wiring between glow plug relay terminal D and PCM terminal 68
• Short to GND in wiring between glow plug fuse and glow plug relay terminal A
• Short to GND in wiring between glow plug relay terminal C and PCM terminal 86
• Short to power circuit in wiring between glow plug relay terminal D and PCM terminal 68
• Short to power circuit in wiring between glow plug relay terminal C and PCM terminal 86
• Glow plug relay power and signal circuits short each other
• Open circuit in wiring between glow plug fuse and glow plug relay terminal A
• Open circuit in wiring between glow plug relay terminal B and GND
• Open circuit in wiring between glow plug relay terminal D and PCM terminal 68
• Open circuit in wiring between glow plug relay terminal C and PCM terminal 86
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
2
INSPECT POOR CONNECTION OF GLOW PLUG RELAY CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 9.
No
Go to next step.
3
INSPECT GLOW PLUG RELAY CIRCUIT FOR SHORT TO GND
• Turn engine switch to OFF.
• Inspect continuity between following harnesses:
- Glow plug relay terminal A and body GND.
- Glow plug relay terminal C and body GND.
- Glow plug relay terminal D and body GND.
• Is there continuity?
Yes
Repair or replace harness for short to GND, go to Step 9.
No
Go to next step.
4
INSPECT GLOW PLUG RELAY CIRCUIT FOR SHORT TO POWER
• Turn engine switch to ON (Engine OFF).
• Inspect voltage between following harnesses:
- Glow plug relay terminal C and body GND.
- Glow plug relay terminal D and body GND.
• Is voltage below 1.0 V?
Yes
Go to next step.
No
Repair or replace harness for short to power, go to Step 9.
5
INSPECT GLOW PLUG RELAY CIRCUIT FOR SHORT WITH EACH OTHER
• Turn engine switch to OFF.
• Inspect continuity between glow plug relay terminals A and C.
• Is there continuity?
Yes
Repair or replace harness for short with each other, go to Step 7.
No
Go to next step.
6
INSPECT GLOW PLUG RELAY CIRCUIT FOR OPEN
• Turn engine switch to OFF.
• Inspect continuity between following harnesses:
- Glow plug fuse and glow plug relay terminal A.
- Glow plug relay terminal B and body GND.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, go to Step 9.
7
INSPECT GLOW PLUG RELAY
• Inspect glow plug relay.
• Is there any malfunction?
Yes
Replace glow plug relay, go to Step 9.
No
Go to next step.
8
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 9.
No
Go to next step.
9
INSPECT GLOW PLUG RELAY CIRCUIT FOR OPEN
• Turn engine switch to OFF.
• Inspect continuity between following harnesses:
- Glow plug relay terminal D and PCM terminal 68.
- Glow plug relay terminal C and PCM terminal 86.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, go to next step.
10
VERIFY TROUBLESHOOTING OF DTC P0380 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Start engine.
• Is same DTC present?
Yes
Replace PCM, go to next step.
No
Go to next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.