DTC P1392:00 [MZR-CD 2.2]

id0102f3149600

DTC P1392:00

Glow plug circuit high input
DETECTION CONDITION
•  The PCM monitors the output signal to the glow relay when the glow relay is off. If the glow relay voltage is 1.0 V or more when the glow relay is off, The PCM determines that there is a malfunction in the glow relay control circuit.
Diagnostic support note
•  The MIL does not illuminate.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  Glow plug relay connector or terminal malfunction
•  Glow plug relay malfunction
•  Short to power supply in wiring harness between glow plug relay terminal C and PCM terminal 1AU
•  Glow plug malfunction
•  PCM connector or terminal malfunction
•  Short to power supply in wiring harness between glow plug relay terminal B and PCM terminal 1BT
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA (MODE2) OR SNAPSHOT DATA HAVE BEEN RECORDED
•  Have FREEZE FRAME DATA (mode2) or snapshot data been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (mode2) and snapshot data on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service 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?
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Perform the KOEO self test.
•  Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
(See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD 2.2].)
4
INSPECT GLOW PLUG RELAY CONNECTOR FOR POOR CONNECTION
•  Switch the ignition to 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
•  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.
6
INSPECT GLOW PLUG RELAY SIGNAL CIRCUIT FOR SHORT TO POWER
•  Switch the ignition to ON (Engine off).
•  Disconnect the PCM connector.
•  Measure the voltage between glow plug terminal C and body ground.
•  Is the voltage more than 1.0 V?
Yes
Repair or replace the wiring harness for a short to power supply, then go to Step 10.
No
Go to the next step
7
INSPECT GLOW PLUG
•  Inspect the glow plug.
•  Is there any malfunction?
Yes
Replace the glow plug, then go to Step 10.
(See GLOW PLUG REMOVAL/INSTALLATION [MZR-CD 2.2].)
No
Go to the next step.
8
INSPECT POOR CONNECTION OF PCM CONNECTOR
•  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 the Step 10.
No
Go to the next step.
9
INSPECT GLOW PLUG RELAY GROUND CIRCUIT FOR SHORT TO POWER
•  Switch the ignition to off.
•  Remove the glow plug relay.
•  Measure the voltage between glow plug relay terminal B and body ground.
•  Is the voltage more than 1.0 V?
Yes
Repair or replace the wiring harness for a short to power supply, then go to the next step.
No
Go to the next step
10
VERIFY TROUBLESHOOTING OF DTC P1392:00 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine and warm it up to the normal operating temperature.
•  Perform the KOEO self test.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
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.
(See DTC TABLE [MZR-CD 2.2].)
No
DTC troubleshooting completed.