15B Engine Control Module Ground Circuit

1. With the ignition switch Off, disconnect the 60-way connector from the ECM.
2. Connect one lead of an ohmmeter to the system ground eyelet, then touch the other lead of the ohmmeter to cavity 15 and 16 of the 60-way connector.
3. If ohmmeter indicates less than .5 ohm of resistance in both wires, replace the ECM.
4. If ohmmeter indicates more than .5 ohm of resistance at one or both wires, repair ground circuit for high resistance to ground eyelet.
5. If ohmmeter indicates infinity, repair wires for an open circuit to the wiring harness splice. If no open is found, replace the ECM.