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DTC P1603: Code Word Is Not Registered In Pcm: Testing

CAUTION: DO NOT crank engine before replacement PCM is programed to immobilizer system or PCM will be severely damaged. If test procedures require replacement of PCM on a vehicle equipped with immobilizer system and less than two valid keys are available, vehicle must be sent to authorized Mazda dealer to have replacement PCM programed.
NOTE: Record freeze frame data. Check for service bulletins and on-line information.
  1. Using scan tool, clear all DTCs. Perform reprogramming procedure. See PROGRAMMING in SECURITY & LOCKS article in ACCESSORIES & EQUIPMENT.
  2. Using scan tool, clear all DTCs. Turn ignition off. Start engine. Recheck DTCs. If same DTC is present, replace PCM and go to next step. PCM is mounted to passenger floor, behind glove box. If same DTC is not present, go to next step.
  3. 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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