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Home >> Mazda >> 2013 >> CX-5 Sport, AWD >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic (Engine Controls) (3 Of 4) >> DTC P0685-00: Main Relay Control Circuit Open >> Diagnostic Procedure

Diagnostic Procedure

DTC P068500 (SKYACTIV-G 2.0) DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) 
Yes Go to the next step.
No Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2).
(See DTC TABLE [SKYACTIV-G 2.0] ).
2 VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED 
  • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?
Yes Go to the next step.
No Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
3 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line 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.
4 INSPECT MAIN RELAY 
  • Switch the ignition to off.
  • Remove the main relay.
  • Inspect the main relay.

    (See RELAY INSPECTION ).

  • Is there any malfunction?
Yes Replace the main relay, then go to Step 11.
No Go to the next step.
5 INSPECT MAIN RELAY POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT 
  • Main relay is removed.
  • Measure the voltage at the main relay terminal D (wiring harness-side).
  • Is the voltage B+  ?
Yes Go to the next step.
No Inspect the MAIN 200 A fuse and ENG.MAIN 40 A fuse.
  • If the fuse is blown:
    • Repair or replace the wiring harness for a possible short to ground.
    • Replace the malfunctioning fuse.
  • If the fuse is deteriorated:
    • Replace the malfunctioning fuse.
  • If all fuses are normal:
    • Repair or replace the wiring harness for a possible open circuit.

Go to Step 11.
6 INSPECT ENGINE2 15 A FUSE 
  • Remove the ENGINE2 15 A fuse.
  • Inspect the ENGINE2 15 A fuse.
  • Is there any malfunction?
Yes If the fuse is blown:
  • Repair or replace the wiring harness for a possible short to ground.
  • Replace the fuse.

If the fuse is deteriorated:
  • Replace the fuse.

Go to Step 11.
No Reinstall the ENGINE2 15 A fuse, then go to the next step.
7 INSPECT PCM POWER SUPPLY CIRCUIT FOR I SHORT TO GROUND 
  • Main relay is removed.
  • Inspect for continuity between main relay terminal C (wiring harness-side) and body ground.
  • Is there continuity?
Yes If the short to ground circuit could be detected in the wiring harness:
  • Repair or replace the wiring harness for a possible short to ground.

If the short to ground circuit could not be detected in the wiring harness:

Go to Step 11.
No Go to the next step.
8 INSPECT PCM CONNECTOR CONDITION 
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
Yes Repair or replace the connector and/or terminals, then go to Step 11.
No Go to the next step.
9 INSPECT PCM GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Main relay is removed.
  • Verify that the PCM connector is disconnected.
  • Inspect for continuity between the following harnesses:
    • PCM terminal 1BZ (wiring harness-side)-Body ground
    • PCM terminal 2AA (wiring harness-side)-Body ground
  • Is there continuity?
Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to Step 11.
10 INSPECT PCM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT 
  • Main relay is removed.
  • Verify that the PCM connector is disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Main relay terminal C-PCM terminal 2S
    • Main relay terminal C-PCM terminal 2T
  • Is there continuity?
Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to the next step.
11 VERIFY DTC TROUBLESHOOTING COMPLETED 
Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
12 VERIFY AFTER REPAIR PROCEDURE 
Yes Go to the applicable DTC inspection.
(See DTC TABLE [SKYACTIV-G 2.0] ).
No DTC troubleshooting completed.