Mazda 6 Workshop Manual page 187

Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related service repair information
availability.
• Is any related repair information available?
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.
• Start the engine.
• Is the same DTC present?
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?
5 INSPECT GLOW PLUG RELAY
• Inspect glow plug relay.
• Is there any malfunction?
6 INSPECT GLOW PLUG RELAY SIGNAL
CIRCUIT FOR SHORT TO POWER
• Turn the engine switch to the ON position
(Engine off).
• Disconnect the PCM connector.
• Measure the voltage between glow plug
terminal A and body GND.
• Is the voltage more than 4.0 V?
7 INSPECT GLOW PLUG
• Inspect glow plug.
• Is there any malfunction?
8 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
9 INSPECT GLOW PLUG RELAY GRAND
CIRCUIT FOR SHORT TO POWER
• Turn the engine switch to off.
• Remove the glow plug relay.
• Measure the voltage between glow plug relay
terminal C and body GND.
• Is the voltage B+?
10 VERIFY TROUBLESHOOTING OF DTC P1392
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine and warm it up to the normal
operating temperature.
• Is the same DTC present?
11 VERIFY AFTER REPAIR PROCEDURE
• Perform the Repair Verification Drive Mode.
(See F2–39 OBD DRIVE
• Is any DTC present?
End Of Sie
ON-BOARD DIAGNOSTIC
INSPECTION
MODE.)
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order,
then go to the next step.
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.
Yes Go to the next step.
No Intermittent concern exists.
Perform the "INTERMITTENT CONCERNS
TROUBLESHOOTING".
Yes Repair or replace the terminal, then go to the next step.
No Go to the next step.
Yes Replace glow plug relay, go to Step 9.
No Go to the next step.
Yes Repair or replace the wiring harness for a short to power
supply, then go to Step 9.
No Go to the next step
Yes Replace glow plug relay, go to Step 9.
No Go to the next step.
Yes Repair or replace the suspected terminal, go to the Step
10.
No Go to the next step.
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
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
F2–175
F2