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Cadillac Repair/intermittent code 34

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Expert: - 10/21/2011


Question
On a 1990 cadillac brougham 5.0 I get an intermittent code 34.
We replaced the map sensor and checked for vacuum hose leaks. We have cleared the code several times and it keeps coming back.
How do you check the sensor wiring?
Thank you-

Answer
Hello,

This is a very primitive computer diagnostics system. It wasn't until 1984 with OBD II where the diagnoses could be specific.
The only way you can check the wiring, is with a 1990 factory electrical manual or a Mitchell manual (like the one I had to abandon when I made my big move from Wisconsin to Texas move. Any other manuals for wiring in my opinion are not going to help you.

I worked on these and remember that something was associated with code 34 with the map sensor code, but I can't remember what. Its simply been too long, too many cars ago. Might have been a 13-O2 sensor that did not show as additional code, but don't remember.

To obtain a manual, you may try Ebay or Craig's list. If you are keeping the car, its something you should have anyway.

Good luck!

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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