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P1633 Diagnostic Trouble Code Discussion for September 2007

TCM Internal - Test External Watchdog Performance

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Trouble Ticket Help Requests for DTC P1633
Help Request Posted
2001 Jaguar S-Type 3.0L MIL Lamp on VIN: SAJDA01N71
P1633: Keep alive memory voltage missing. CEL comes on after about 20 seconds every time engine is started. Alldata says to test for voltge at PCM connector FH1-44. It has no voltage key on or off. Alldata says to test wiring between FH1-44 and splice FHS-10. Not showing this splice on Alldata wirin...
September 21, 2007