2006-10-02 14:23:54 · 2 answers · asked by ww200523 1 in Cars & Transportation ➔ Maintenance & Repairs
ECMs can go out or be defective on their own and there is no sure fire way to test them that I know of, but you can sometimes tap lightly on the aluminum case with the handle of a screwdriver while the engine is running. If this induces changes in RPM or other symptoms, then you've probably got a bad one.
ECM's can also go out when there are problems with the sensed or controlled circuits connected to the ECM. This might be something like a sensor shorted to ground or 12 volts. Some people recommend testing all the ECM circuits prior to installing a new ECM to avoid blowing it up. This may sound tedious but trashing two or three ECMs can get pretty expensive.
2006-10-02 16:05:22 · answer #1 · answered by ladylucknc 4 · 0⤊ 0⤋
What are you trying to test for?
The codes stored in it will tell yo if it finds a problem with itself or not. Any code that the center digit is a "6" (e.g. P0603, KAM error) indicates a PCM failure.
What is the failure?
If the PCM has failed, there is a reason, a cause for it to give up. They don't just quit of their own direction.
If you do indeed have a defective PCM, find out what it was that caused it to fai before you replace it, or you could be replacing it again.
Good Luck
2006-10-02 14:39:46 · answer #2 · answered by Ironhand 6 · 0⤊ 0⤋