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P1603 Diagnostic Trouble Code Discussion for February 2009

PCM Internal Shutdown Timer Rationality

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Trouble Ticket Help Requests for DTC P1603
Help Request Posted
2001 Mazda MPV DX 2.5L No Start VIN: JM3LW28Y21
P1603: Key Identification Numbers Not Registered In The PCM. ... thieft system in the pcm. We replaced the pcm with a remanufactured unit. Upon replacement we've attempted to perform the (what we think)code word write into into the pcm using the processe that alldata uses by turning different keys on and off with no suc...
February 24, 2009