Overdrive Switch
- Check for continuity between O/D switch harness connector terminals. Continuity should exist with switch in OFF position. Continuity should not exist with switch in ON position. Replace switch as necessary.
- Turn ignition on. Using DVOM, measure voltage (backprobe) between ground and TCM harness connector terminal No. 22. With O/D switch in ON position, battery voltage should be present. With O/D switch in OFF position, one volt or less should be present. If voltage is not as specified, repair circuit as necessary.