Join Now
International Automotive Technicians Network

P1633 Diagnostic Trouble Code Discussion for September 2007

TCM Internal - Test External Watchdog Performance


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

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
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