Sunday, January 21, 2007

Car hesitates on 1999 Cavalier with 2.2L engine: No codes


I have a 1999 Cavalier and lately, I have an intermittent hesitation and misfiring and the check engine light will come on in the dash. However, if I scanned it, my scanner will not communicate with the engine computer (ecm).
What do I do?

ATS Advisor:

There is common cause for this problem and it is attributed to the poor location of the ecm. If you look under the front fender of the car and remove the cover, you will see the ecm. A lot of times, because it is too close to the ground and rain water when you are driving, the wire terminals to the ecm will be corroded. When that happens, the wires will be covered with "green stuff" and later the wire can have a poor contact or even break. Try wiggling the wires to the ecm and find which wire is broken. Repair if necessary.

If the ecm will still have no communication with your scanner, remove the ecm and test all the ground and power supply wires as per ATS past newsletters (testing ecm). If the readings are normal and reference voltage is erratic, replace the ecm.

ATS Tip:

To get a detailed wiring diagram of your ecm, please contact ATS.


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