ECM Power and Ground Supply Circuits

ECU Ground Circuit:

GROUND CIRCUIT
1. Disconnect the engine control module connector.
2. Using an ohm meter, check for continuity between engine control module harness terminal 5 and ground.

Continuity: Should exist.

3. Using an ohm meter, check for continuity between engine control module harness terminal 10 and ground.

Continuity: Should exist.

If any of the previous tests produce unsatisfactory results, the harness will need to be repaired or replaced. Once repairs have been completed, road test the vehicle to confirm that the repair has corrected the problem.

If the same problem reoccurs, it is possible that there is an intermittent failure of the component or the engine control module. Check for looseness at all harness junctions and test for an intermittent failure.