DTC P138B [MZ-CD 1.6 (Y6)]


B3E010201300W04

DTC P138B

Glow plug relay system voltage

DETECTION CONDITION

• Glow plug supply - Plug short, over current, relay stuck

POSSIBLE CAUSE

• Glow plug relay malfunction
• PCM malfunction
• Connector or terminal malfunction
• Open circuit in wiring harness between glow plug relay terminal C and PCM terminal 111
• Short to ground in wiring harness between glow plug relay terminal C and PCM terminal 111
• Short to power supply in wiring harness between glow plug relay terminal C and PCM terminal 111

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
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.
No
Go to the next step.
3
VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Connect the WDS or equivalent to the DLC-2.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the "INTERMITTENT CONCERNS TROUBLESHOOTING".
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 10.
No
Go to the next step.
5
INSPECT GLOW PLUG RELAY CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the engine switch to the ON position.
• Remove the glow plug relay.
• Measure the voltage between glow plug relay 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 10.
No
Go to the next step.
6
INSPECT GLOW PLUG RELAY
• Inspect the glow plug relay.
• Is there any malfunction?
Yes
Replace the glow plug relay, then go to Step 10.
No
Go to the next step.
7
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 10.
No
Go to the next step.
8
INSPECT GLOW PLUG RELAY CONTROL CIRCUIT FOR SHORT TO GROUND
• Turn the engine switch off.
• Inspect for continuity between glow plug relay terminal C and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for a short to ground, then go to Step 10.
No
Go to the next step.
9
INSPECT GLOW PLUG RELAY SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between glow plug relay terminal C and PCM terminal 111.
• Is there continuity?
Yes
Go to the next step
No
Repair or replace the wiring harness for an open circuit, then go to the next step.
10
VERIFY TROUBLESHOOTING OF DTC P138B COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• 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.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform the after repair procedure.
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.