Dtc P1392 - Mazda 6 Workshop Manual

STEP
12 INSPECT GLOW PLUG RELAY SIGNAL
CIRCUIT FOR SHORT TO GRAND
• Turn the engine switch off.
• Remove the glow plug connector.
• Inspect for continuity between glow plug relay
terminal A and body GND.
• Is there continuity?
13 INSPECT GLOW PLUG RELAY SIGNAL
CIRCUIT FOR OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between glow plug relay
terminal A and PCM terminal 86.
• Is there continuity?
14 VERIFY TROUBLESHOOTING OF DTC P1391
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Start the engine.
• Is the same DTC present?
15 VERIFY AFTER REPAIR PROCEDURE
• Perform the Repair Verification Drive Mode.
(See F2–39 OBD DRIVE
• Are any DTCs present?
End Of Sie

DTC P1392

DTC P1392 Glow plug circuit high input
• The PCM monitors the output signal to the glow relay when the glow relay is off. If the glow relay voltage is
4.0 V or more when the glow relay is off, The PCM determines that there is a malfunction in the glow relay
control circuit.
DETECTION
Diagnostic support note
CONDITION
• The MIL does not illuminates.
• The DTC is stored in the PCM memory.
• Glow plug relay malfunction
• Glow plug malfunction
• PCM malfunction
POSSIBLE
• Connector or terminal malfunction
CAUSE
• Short to power supply in wiring harness between glow plug relay terminal C and PCM terminal 68
• Short to power supply in wiring harness between glow plug relay terminal A and PCM terminal 86
ON-BOARD DIAGNOSTIC
INSPECTION
MODE.)
Yes Repair or replace the wiring harness for a short to GND,
then go to Step 12.
No Go to the next step
Yes Go to the next step
No Repair or replace the wiring harness for an open circuit,
then go to the next step.
Yes Replace the PCM, go to the next step.
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See F2–40 DTC TABLE.)
No Troubleshooting completed.
ACTION
B6E407001300102
F2–173
F2