The camshaft position sensor is on the rear cylinder head on the left end (the serpentine belt end of the engine - passenger side). It is a son-of-a gun to get at. When it is bad or the connector is intermittant or bad, the symptom will be irregular idle from 500 to 750 RPM or so.
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repairpal.com > Problems > Cadillac > Eldorado Cadillac Eldorado Power seat operation erratic. This is a verified problem based on 26 reports. Learn more about this problem, when it occurs and how to fix it. ... 13 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 ... Come back and drivers seat will not move.
This indicates that a problem was detected in the camshaft position sensor
circuit. Since it says circuit, that means the problem could
lie in any part of the circuit - the sensor itself, the wiring, or the PCM.
Don't just replace the CPS (camshaft position sensor) and think that will definitely
Symptoms can include:
Hard starting or no start
Rough running / misfiring
Loss of engine power
With a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here
are some things to try:
Visually inspect all the wiring and connectors in the circuit
Check for continuity in the circuit wiring
Check the operation (voltage) of the camshaft position sensor
Replace the camshaft position sensor as required
Check the crankshaft position circuit as well
Replace circuit wiring and/or connectors as required
I am not sure if this will help you but PO27 is listed as "Open Throttle Signal Switch" which could mean that your throttle position sensor needs replacing. Although with Cadillacs, it could mean anything. I hope this helps...
DTC (diagnostic trouble code) P0340 is indicating a fault has occured in the camshaft position sensor system of the cars' electronic engine control system. DTC P0717 is for a transmission input turbine shaft speed. Typically these codes are unrelated. Both the sensors are variable reluctance devices. They have no moving parts and as such are robust and not usually prone to failure. But they can and do fail. Are either codes "hard" faults or are they in the continous memory of the computer? Does the P0340 clear itself when the engine is shut off and restarted? Can you cause the P0340 to reoccure just by starting the engine and with out driving it and revving the engine to 1500 to 2000 rpm for 1 to 2 minutes while in Park? The P0717, when cleared should only reoccure when the car is driven. If the camshaft position sensor has been replaced and still the same code occures make sure you have the correct information as to the meaning of this code in regards to your particular model year and engine. Does the engine have a camshaft position sensor for each camshaft? If so what is the DTC code for the other camshaft position sensor. Yes, the engine's computer (ICM, PCM, ECM, all terms for same thing) could be faulty but in most cases this is not the problem. Does the transmission seem to shift properly? You probably won't notice a differnece in the way the engine runs if the camshaft position fails due to the default stratagy used in the ICM. Wiring would be my next area of concern. Does the wiring for the camshaft position sensor and the transmission sensor go through the same wiring harness and could you have a poor connection at some point in that harness? Inspect the wiring and the hardshell connectors throughout the harness. Let me know what you find out. Thanks