How to Troubleshoot Circuits At the ECM/PCM

How to Troubleshoot Circuits at the ECM/PCM






Connect the backprobe adapters to the stacking patch cords, and connect the cords to a multimeter.

Using the wire insulation as a guide for the contoured tip of the backprobe adapter, gently slide the tip into the connector from the wire side until it comes in contact with terminal end of the wire.






CAUTION: Puncturing the insulation on a wire can cause poor or intermittent electrical connections.

Bring the tester probe into contact with the terminal from the terminal side of wire harness connectors in the engine compartment.

For female connectors, just touch lightly with the tester probe and do not insert the probe.