P1635 DTC Diags help
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P1635 DTC Diags help
Ikeep getting a DTC P1635 reading about the 5 Volt Reference Circuit. I have replaced sensors but still get the error. I foun d a electrical diagram and troubleshooting guide for a 99 firebird but I'm sure that my 2003 Park Ave Ultra is different. I have searched but cannot find the diagram for the PA. Does anyone have a valid link?
#2
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Which sensors did you replace?
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To answer both questions
I changed the MAP sensor and the EGR.
The reason I am looking for a link to the circuit diagram for the 2003 ParkAve Ultra is so I can find out which terminals between the PCM and sensors to check. The diag I have is for a 99 Firebird. The PCM for the buick has a lot more connections.
Thanks for the responses.
I changed the MAP sensor and the EGR.
The reason I am looking for a link to the circuit diagram for the 2003 ParkAve Ultra is so I can find out which terminals between the PCM and sensors to check. The diag I have is for a 99 Firebird. The PCM for the buick has a lot more connections.
Thanks for the responses.
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