DTC P1392:00 [MZR-CD 2.2]
id0102f3149600
DTC P1392:00 |
Glow plug circuit high input |
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DETECTION CONDITION
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• 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.
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POSSIBLE CAUSE
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• 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 D and PCM terminal 1BT
• PCM malfunction
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED SERVICE INFORMATION
• Verify related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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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.
• Start the engine.
• Is the PENDING CODE for this DTC present?
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Yes
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Go to the next step.
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No
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Intermittent concern exists.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
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4
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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?
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Yes
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Repair or replace the terminal, then go to the next step.
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No
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Go to the next step.
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5
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INSPECT GLOW PLUG RELAY
• Inspect the glow plug relay.
(See RELAY INSPECTION.)
• Is there any malfunction?
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Yes
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Replace the glow plug relay, then go to Step 9.
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No
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Go to the next step.
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6
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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?
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Yes
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Repair or replace the wiring harness for a short to power supply, then go to Step 9.
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No
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Go to the next step
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7
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INSPECT GLOW PLUG
• Inspect the glow plug.
• Is there any malfunction?
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Yes
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Replace the glow plug, then go to Step 9.
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No
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Go to the next step.
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8
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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?
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Yes
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Repair or replace the suspected terminal, then go to the Step 10.
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No
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Go to the next step.
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9
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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 D and body ground.
• Is the voltage more than 1.0 V?
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Yes
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Repair or replace the wiring harness for a short to power supply, then go to the next step.
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No
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Go to the next step
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10
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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.
• Is the PENDING CODE for this DTC present?
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Yes
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Replace the PCM, go to the next step.
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No
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Go to the next step.
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11
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VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Is any DTC present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [MZR-CD 2.2].)
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No
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Troubleshooting completed.
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