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Home >> Mazda >> 2005 >> 3 SP23, 4D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0638 >> Diagnostic procedure

Diagnostic procedure

DTC P0638 DIAGNOSTIC PROCEDURE

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 the FREEZE FRAME DATA on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Technical Service Bulletin(s) 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.
3 VERIFY RELATED PENDING CODE OR STORED DTC 
  • Turn the ignition switch off, then to the ON position (Engine off).
  • Verify the related PENDING CODE or stored DTCs.
  • Are other DTCs present?
 Yes Go to the applicable DTC inspection. (See DTC TABLE )
No Go to the next step.
4 VERIFY TROUBLESHOOTING OF P0638 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start the engine.
  • Is the same DTC present?
 Yes Replace the PCM, go to the next step. (See PCM REMOVAL/INSTALLATION .)
No Go to the next step.
5 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection. (See DTC TABLE )
No DTC troubleshooting completed.
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