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post #1 of 2 (permalink) Old 09-22-2012, 05:16 PM Thread Starter
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Camshaft Position Sensor Error with None Installed

I am the owner of a 2006 Cobalt, LS, standard, 2.2L. The engine light came on about a year ago and the only error code that came up was the camshaft position sensor needed to be replaced. I bought the part, went to install it, and could not find it ANYWHERE on my engine. Come to find out, the 2006 Cobalts did not have this particular sensor installed. Does anyone know what I can do to get rid of this error? What the possible causes for this error could be? Thank you very much!

-Tim
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post #2 of 2 (permalink) Old 09-22-2012, 05:51 PM
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What is the DTC code maybe I can help...which engine?

---------- Post added at 08:34 PM ---------- Previous post was at 08:29 PM ----------

Odd!!! the service manual for 2006 has a camshaft position sensor replacement procedure for the 2.0L and the 2.4L (Two sensors intake and exhaust), but none for 2.2L so you must be right.

Have you tried just clearing the code?

---------- Post added at 08:50 PM ---------- Previous post was at 08:34 PM ----------

OK, found you some info.

This ignition system does not use a conventional camshaft position (CMP) sensor that detects valve train position. The ignition control module (ICM) detects when #1 or #3 cylinder has fired on the cylinders compression stroke using sensing circuitry integrated within each coil. The sensing circuit detects the polarity and the strength of the secondary voltage output. The higher output is always at the event cylinder. The ICM sends a CMP signal to the engine control module (ECM) based on the voltage difference between the event and waste cylinder firing energy. This system is called compression sense ignition. By monitoring the CMP and crankshaft position (CKP) signals, the ECM can accurately sequence the fuel injectors. If the ECM does not receive a CMP signal from the ICM, DTC P0340 sets.

---------- Post added at 08:51 PM ---------- Previous post was at 08:50 PM ----------

More info:
Action Taken When the DTC Sets
• The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

• The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC
• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

• Clear the MIL and the DTC with a scan tool.

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Last edited by Coby7; 09-22-2012 at 05:40 PM.
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