Question about 1994 Cadillac DeVille

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RICH I HAVE A 96 ELDORADO NORTHSTAR ENGINE CODE SHOW THAT P0340 IS CAMSHAFT POSITION SENSOR A,BANK 1 MALFUNCTION I REPLACE IT NEW THINKING THAT IT WAS BAD IT STILL HAVE THE SAME CODE CAN IT BE THE ICM PLUS OTHER CODE P0717 CAN YOU ME FIND PROBLEM

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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

Posted on Sep 28, 2008

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My car is showing p0340 camshaft sensorit was replaced and car still wont start, due to a faulty fuel gauge ran car out of gas also but fuel is on the rail, NO fire, thinking I lost timing,need help


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because it denotes bank i ( bank closest to the fire wall) did you change the correct sensor
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I have a Chevy 2006 Aveo. Two codes came up when the engine check light was put on a scanner. Code P0340 and Code P0133. The check engine light has turned off and on by itself several times in the...


P0340 OBD-II Trouble Code - Camshaft Position Sensor Circuit Malfunction

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 fix it.

Symptoms can include:
* Hard starting or no start
* Rough running / misfiring
* Loss of engine power

Causes: A code P0340 could mean one or more of the following has happened:
* a wire or connector in the circuit could be grounded/shorted/broken
* the camshaft position sensor may have failed
* the PCM may have failed
* there exists an open circuit
* the crankshaft position sensor may have failed

Possible Solutions: 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
* Diagnose/replace the PCM as required



P0133 OBD-II Trouble Code - Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)

This involves the front oxygen sensor on Bank 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms.

Causes: A code P0133 may mean that one or more of the following has happened:
* The oxygen sensor is faulty
* The wiring to the sensor is broken / frayed
* There is an exhaust leak

Possible Solutions: The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the front Bank 1 oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
* Check and fix any exhaust leaks
* Check for wiring problems (shorted, frayed wires)
* Check the frequency and amplitude of the oxygen sensor (advanced)
* Check for a deteriorating / contaminated oxygen sensor, replace if necessary
* Check for inlet air leaks
* Check the MAF sensor for proper operation


Hope this helps (remember to rate this answer).

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