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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 629 (On-Board Diagnostic (Engine Control System MZI-3.7) (2 Of 5)) >> DTC P0040:00, P0041:00 [MZI-3.7] >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related Service Bulletins available?
 Yes Perform repair or diagnosis according to the available Service Bulletins
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 INSPECT A/F SENSOR/HO2S WIRING HARNESS CONNECTORS 
  • For P0040:00, visually inspect the vehicle A/F sensor wiring harness connector (s) for any indication of crossed wires (Also, stretched or incorrectly mounted wiring harnesses).
  • For P0041:00, visually inspect the vehicle HO2S wiring harness connector (s) for any indication of crossed wires (Also, stretched or incorrectly mounted wiring harnesses).
  • For P0040:00, P0041:00, visually inspect the vehicle PCM of A/F sensor/HO2S signals wiring harness connector (s) for any indication of crossed wires (Also, stretched or incorrectly mounted wiring harnesses).
  • Are there crossed connections or wires?
 Yes Repair if necessary.
No Unable to duplicate or identify the cause of concern at this time.
Perform the "INTERMITTENT CONCERN TROUBLESHOOTING" procedure.
4 VERIFY TROUBLESHOOTING OF DTC P0040:00, P0041:00 HAVE BEEN COMPLETED 
  • Verify that all disconnected connectors reconnected
  • Switch the ignition to ON (Engine off).
  • Clear the DTC from the PCM memory using the M-MDS.
  • Start the engine and run it at idle
  • Perform KOER self-test

    (See KOEO/KOER SELF TEST [MZI-3.7] .)

  • Is the PENDING CODE for this DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
No Go to the next step.
5 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No Troubleshooting completed.
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