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P1633 Diagnostic Trouble Code Discussion for March 2011

TCM Internal - Test External Watchdog Performance

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Trouble Ticket Help Requests for DTC P1633
Help Request Posted
1999 Mercury Mystique GS 2.0L No Start VIN: 1MEFM6533X
P1633: . ... guys. We have a 1999 mercury with the 2.0 engine. Car came in as a no start with code p1633. The battery checks ok and the fuses check ok in the fuse box under the hood. The check engine light is on with the key on. Engine has no spark. Engine does roll ov...
March 14, 2011
2000 Ford Taurus SE 3.0L MIL Lamp on VIN: 1FAFP5527Y
P1633: keep alive power supply pcm. no other symptoms or needs.any thoughts or history on this fault would be helpful.
March 23, 2011