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Old 03-11-2012, 01:58 AM   #1
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Default 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?
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Old 03-11-2012, 09:23 AM   #2
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Which sensors did you replace?
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Old 03-12-2012, 08:22 AM   #3
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https://www.gmforum.com/showthread.p...ighlight=P1635

did you check the sensors connectors for 5v?
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Old 03-18-2012, 07:28 PM   #4
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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.
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Old 03-19-2012, 07:42 AM   #5
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Old 03-19-2012, 11:49 PM   #6
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GREAT ! ! This is exactly what I was looking for. The one I had for the firebird only had 2 sensors.

Thanks !
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