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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 P0068:00 [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 next step
No Record FREEZE FRAME DATA on the repair order, then go to next step
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins availability.
  • Is any related Service Bulletins available?
Yes Perform repair or diagnosis according to available Service Bulletins
  • If vehicle is not repaired, go to next step
No Go to next step.
3 VERIFY RELATED PENDING CODE OR STORED DTC 
  • Verify the related PENDING CODE or stored DTCs.
  • Are other DTCs present?
Yes Go to appropriate DTC inspection.
(See DTC TABLE [MZI-3.7] )
No Go to next step.
4 INSPECT FOR INLET AIR LEAKS 
  • Listen for an noise around the MAF sensor and throttle body while the engine is running
  • Is a concern present?
Yes Repair as necessary Go to Step 8
No Go to next step.
5 INSPECT FOR TP2 SIGNAL HIGH VERSUS LOAD WHILE DRIVING THE VEHICLE 
  • Switch the ignition to ON (Engine running).
  • Access the TP2 and LOAD PIDs using the M-MDS
  • Is the TP2 PID more than 2.44 V and the LOAD PID less than 30%?
Yes Replace the malfunctioning part, then go to Step 8
No Go to next step
6 INSPECT FOR TP2 SIGNAL LOW VERSUS LOAD WHILE DRIVING THE VEHICLE 
  • Switch the ignition to ON (Engine running).
  • Access the PCM and monitor the TP2 and LOAD PIDs
  • Is the TP2 PID less than 0 24 V and the LOAD PID more than 55%?
Yes Repair or replace the malfunctioning part, then go to Step 8.
No Go to next step.
7 INSPECT FOR SELF-TEST DTCS 
  • Switch the ignition to ON (Engine running).
  • Clear DTC from memory using M-MDS.
  • Drive the vehicle while exercising the throttle.
  • Retrieve the continuous memory DTCs.
  • Are any DTCs present?
Yes Replace the malfunctioning part, then go to the next step.
No Perform the "INTERMITTENT CONCERN TROUBLESHOOTING". Then go to the next step.
8 VERIFY TROUBLESHOOTING OF DTC P0068:00 HAS BEEN COMPLETED 
  • Verify that all disconnected connectors reconnected.
  • Clear DTC from memory using M-MDS.
  • Start engine.
  • Perform "KOEO/KOER self-test"

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

  • Is same DTC present?
Yes Replace PCM, then go to next step.
No Go to next step.
9 VERIFY AFTER REPAIR PROCEDURE 
Yes Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No Troubleshooting completed.