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Home >> Mazda >> 2003 >> MPV ES >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1623: Code Word Or Key Id Number Read/Write Error In Pcm >> Diagnostic Procedures

Diagnostic Procedures

  1. Check for service bulletins and on-line information. Repair as necessary. After repair, go to next step.
  2. Verify DTC P1623 Detected Again -  Using scan tool, clear all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off. Start engine. Recheck DTCs. If DTC P1623 is present, replace PCM. Perform reprogram procedure. See appropriate IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT. After repair, go to next step. If DTC P1623 is not present, go to next step.
  3. Verify After Repair Procedure -  Using scan tool, perform after repair procedure. See AFTER REPAIR PROCEDURE . If DTC is not present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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