DTC 45 - Transmission Overdrive Solenoid Circuit - Test FC-10A

1. Using DRB-II, erase fault codes and actuate overdrive solenoid.Wait 10 seconds. Using DRB-II, read codes. If overdrive solenoid control circuit fault returns, go to step 3). If overdrive solenoid control circuit fault does not return, wiggle wiring harness between transmission connector and PCM with actuator test still running. Using DRB-II, read faults. If overdrive solenoid control circuit fault returns, go to step 3).
2. If overdrive solenoid control circuit fault does not return, fault is not present at this time. TRANS OVERDRIVE SOLENOID CIRCUIT fault is set if solenoid control wire is not in its proper state when monitored by PCM (i.e., circuit voltage is low when solenoid should be off or high when solenoid should be on). Possible causes are open or shorted overdrive control circuit wire, open or shorted overdrive solenoid coil, and open 12-volt feed to overdrive solenoid. See INACTIVE FAULT CONDITION. Test is complete. Perform TEST VER-1.
3. Disconnect overdrive solenoid connector on transmission. Using DRB-II in voltmeter mode, probe overdrive solenoid connector, ignition feed circuit (Dark Blue wire). If reading is 10 volts or less, repair open Dark Blue wire. Perform TEST VER-1. If reading is more than 10 volts, turn ignition off. Disconnect PCM connector. Using DRB-II in ohmmeter mode, probe PCM connector terminal No. 55, overdrive solenoid control circuit (Orange/Light Green wire).
4. If resistance is less than 5 ohms, repair Orange/Light Green wire for a short to ground. Perform TEST VER-1. If resistance is 5 ohms or more, check resistance of overdrive solenoid control circuit (Orange/Light Green wire) using an external ohmmeter. If resistance is 5 ohms or more, repair open Orange/Light Green wire. Perform TEST VER-1. If resistance is less than 5 ohms, reconnect overdrive solenoid connector.
5. Turn ignition on. Using DRB-II in voltmeter mode, probe PCM connector terminal No. 55, overdrive solenoid control circuit (Orange/Light Green wire). If reading is more than 10 volts, replace PCM. Perform TEST VER-1. If reading is 10 volts or less, replace overdrive solenoid in transmission. Perform TEST VER-1.