O/D Switch Circuit Troubleshooting
O/D Switch Circuit Troubleshooting1. Turn the ignition switch OFF.
2. Disconnect the O/D switch/shift lock solenoid connector.
3. Check for continuity between O/D switch/shift lock solenoid terminals No. 1 and No. 2 while pressing the O/D switch and when the switch is released.
Is there continuity while pressing the O/D switch, and no continuity when the switch released?
YES-Go to step 4.
NO-Replace the O/D switch.
4. Turn the ignition switch ON (II).
5. Shift the shift lever to the D position.
6. Measure the voltage between O/D switch/shift lock solenoid connector terminals No. 1 and No. 2.
Is there battery voltage?
YES-O/D switch circuit is OK. Check for loose terminals.
NO-Go to step 7.
7. Measure the voltage between O/D switch/shift lock solenoid connector terminal No. 1 and body ground.
Is there battery voltage?
YES-Repair open in the wire between O/D switch/ shift lock solenoid connector terminal No. 2 and ground (G451), or repair poor ground (G451).
NO-Go to step 8.
8. Measure the voltage between PCM connector terminal D3 and body ground.
Is there battery voltage?
YES-Repair open or short in the wire between PCM connector terminal D3 and O/D switch/shift lock solenoid connector.
NO-Check for a short in the wire between PCM terminal D3 and O/D switch/shift lock solenoid connector. Check for loose or poor connections at PCM connector terminal D3. If the wire and connections are OK, substitute a known-good PCM and recheck.