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Cadillac Repair/cadillac catera fuel pump

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Expert: - 8/28/2010


Question
i have a 99 cadillac catera i put a new fuel pump in and a new fuel pump relay i checked all the fuses and they are good the problem is the fuel pump has no power going to it saw on the net it could be the oil sensor switch but it has good oil pressure i took my test light and hooked to it and when the key is turned on thers no power lighting my test light but when the car cranks my test light lights up but the pump still dont pump any fuel got any ideas

Answer
Hello,

I hate to rain on your parade because of all the time and expense you went to so far, but in this case, you probably can't repair this car yourself.

This does sound like a transponder anti-theft problem.

Readers, please do not look at this answer and think it is the same problem when engine does not start.

It sounds like the computer is not reading a factory electronically programmed ignition key.

You need to have the transponder ignition system checked at the dealer. They have the tech II scanner needed for diagnoses.

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Rob Painter

Expertise

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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