Engine Control Module: Testing and Inspection

Fig. 2 Ground Test:

1. Turn ignition switch to Off position.
2. Connect a suitable ohmmeter from control module support mount to battery ground terminal, Fig. 2.
3. Ohmmeter should indicate .2 ohms or less.
4. If ohmmeter indicates more than .2 ohms, check for faulty support, mounting and battery ground connections. Also ensure the control module casing is clean and mounting nuts and/or bolts are clean and tight.