Mazda Factory OBD-II DTC P1602 Code Diagnostic Procedure

Mazda P1602 Immobilizer/PCM communication error
DETECTION CONDITION
•  PCM internal malfunction
POSSIBLE CAUSE
•  PCM malfunction

Diagnostic procedure

STEP INSPECTION ACTION
1
Replace the PCM, then go to the next step.
2
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.

 

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