Question about 1998 Saturn SL

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The service light is on. I had a check run and was told the camshaft sensor was the problem. But they can't find it. Can you tell me where it is located this is on a 1998 Saturn SL1 with auto transmission.

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It doesn't have an actual camshaft sensor. What they do is monitor the collapsing electromagnetic field of the 1-4 coil with the ignition module.

The fix is to remove the two coils, remove the ignition module, and using a scotchbrite pad clean the module mounting surface on the transmission thoroughly. Once it is cleaned reinstall the module and the coils. Use new bolts that are available from Saturn/GM dealer. Clear the codes. and you should be good to go.

In rare cases the ignition wires and/or the ignition module will also need to be replaced.

This is or was a pretty common problem with saturns. There is a TSB for it.

Posted on May 25, 2011

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  • Saturn Master
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I think the cam sensor is at the back of the camshaft on the drivers side of the motor under a cap with wires that go to it.not sure.

Posted on May 25, 2011

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I recently bought a 2005 Dodge Neon, the oil light was coming on so I reported to dealer who replaced oil sensor switch, now the check engine light is on so I bought a pocket scanner and it comes up with...


Trouble Code: P0340

No Camshaft Position Sensor Circuit Failure

Possible Causes:


CMP Sensor connector is damaged, open or it is shorted.CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuit.CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage.CMP Sensor ground circuit is open.CMP Sensor is damaged or has failed.CKP Sensor is damaged or has failed.PCM has failed.I would make a copy of this and tell him that the camshaft needs to be replace or what ever is causing problem,they probaly know.

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P 0340 VECTRA 120CP


P0340 - Camshaft Position Sensor 'A' Circuit Malfunctionxicon.jpghttp://engine-codes.com/p0340.htmlForum CodePossible causes- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty Camshaft Position Sensor
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery Tech notes Sometimes and in some models, low battery voltage or a weak starter can can trigger a Camshaft Position Sensor code.
When is the code detected?The camshaft position sensor signal is not detected by the Engine Control Module(ECM) during the first few seconds of engine crankingSymptoms- Engine Light ON (or Service Engine Soon Warning Light)
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- Engine StallP0340 Description The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Engine Control Module(ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The camshaft position sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.

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On my 2006 f150 ford what the purpose of a cam aensor and how to tell if it bad


Hi there:
The camshaft sensor is located in the hood, beside the engine. However, it isn't always easy to find it. This is because the exact position of the camshaft sensor depends on the car brand. That said; whichever the car, you'll find the camshaft sensor in either one of three locations: by the side of the engine block, behind the cylinder head, or in the car's lifter valley.


The camshaft sensor is a small, but significant, magnetic device. It gathers and sends information about the car's camshaft speed (and as a result the position of each piston) to the car's electronic control module. This information is received by the computer, which then uses this data to further calculate the time of ignition and the timing of fuel injection required by the engine. This information is vital for engine function.


At times, either due to accidents or due to wear and tear, the camshaft sensor can weaken. In the case of a camshaft sensor failure, the weak or disrupted signal is interpreted by the computer as a problem, and this affects the proper running of the vehicle. A failing camshaft sensor can be identified based on any one of the 3 following symptoms.


1. "Check Engine" Light
The first symptom of a failing camshaft sensor manifests as a warning from the car's control module. As the camshaft sensor fails, the computer sends the driver a warning sign via the "check engine" light on the cars dashboard. When the check engine light first comes on, the driver has enough time to service the car and replace all faulty parts, including the failing camshaft sensor. However, if you ignore this flashing light for a considerable time, it could later lead to severe engine trouble.


2. Disrupted Driving
Another symptom of a failing camshaft sensor is experiencing constant disruption while driving. If you are experiencing symptoms like frequent stalling, poor idling of the car at 500 to 600 rpms, a massive drop in the rpms slowing down the car to a crawl, a noticeable drop in engine power, poor mileage, abnormal acceleration activity, frequent stumbling, etc., it probably means you have a failing camshaft sensor that needs immediate attention. If you are experiencing these symptoms, it is best to seek a mechanic before the situation gets worse and the car gives up, refusing to start at all.


3. Ignition Trouble
If you ignore all of the above symptoms, you end up with one that really can't be ignored-no ignition. Remember, as the sensor begins to weaken, so does the signal it transmits to the cars computerized control station. If you let the problem carry on for too long, the engine will suffer from a "no spark" situation. Once the signal switches off, so will your engine, thereby stranding you. Thus, it is best not to let your car get to this stage.


This video about CAM or Camshaft Position Sensor Testing could help....




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I doubt very much that you are looking at a faulty mass airflow sensor. I can tell you from my 25+ years of experience that the most common cause unless the camshaft position sensor is bad is there is a bad ground. Below is a pictire of the plug for the sensor. What you need to do, with an ohm meter is check for continuity between terminal 1 and the engine ground. If you do not have continuity this would be the problem of why the code is setting and the wire needs to be repaired. Like I said this is the most common that I have come across. There are many different reasons as well as many different tests that can be done but I would start there. The bad thing is that many of the tests are going to require the proper equipment which most people do not have in thier tool box. If you are in need of more testing procedures or any other information on this code which basically says it's a fault in the camshaft position circuit, feel free to email me at csautomotivecars@att.net with detailed questions so i am sure to send you the right information. I hope this helps and good luck.


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