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How do you test the Electronic Control Module on a 1993 Pontiac Transport?
Wiki User
∙ 16y ago
The only definitive test for the ECM for all possible problems is to establish a set of circumstances during which the behavior/symptom you expect is caused by the ECM always occurs and create these same conditions using a known good ECM.
Failing that, you can test the vehicle systems around the ECM and determine that there is definitely no (external) problem other than the ECM to prove that the ECM is faulty. Typically, you determine which inputs and outputs are related to the undesired behavior and check for correct signals in/out of the ECM by backprobing the connectors and using suitable equipment including a quality multimeter and an oscilloscope. Do not forget to verify that the connectors make good contact at the ECM.
Also, try gently tapping the ECM with a screwdriver handle or twisting the ECM with your hands.
Wiki User
∙ 16y ago
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