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P1635 Diagnostic Trouble Code Discussion for July 2006

5-Volt Reference 'A' Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1635
Help Request Posted
2003 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1G1CFCHGVH
P1635: 5-Volt Reference 1 Circuit Malfunction. ... chartfor P1635. I have 5-volt ref. at egr,tps,map code keeps coming back checked harness found no problem the only runnng problem is high idle intermittenty clear code drops down to norm. And one time while testing i had 6.25v at tps and other still 5v onl...
July 29, 2006