Chart C-8B Reverse Lockout System Chart

Chart C-8B Reverse Lockout System:

Reverse Solenoid Lockout System Wiring Diagram:

Circuit Description:

The reverse lockout solenoid will be energized when the ECM grounds CKT 1652, which will allow the transmission to be shifted into reverse. The ECM will enable the reverse lockout solenoid whenever vehicle speed is below 4 mph. When vehicle speed is above 5 mph, the ECM will de-energize the reverse lockout solenoid, which will prohibit the transmission from being shifted into reverse.

Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.

1. The reverse lockout solenoid will be enabled whenever vehicle speed is below 5 mph. If there is a fault in the vehicle speed sensor circuit and the ECM is not receiving VSS signal, the reverse lockout solenoid would be enabled at speeds above 5 mph (8 km/h) and the shifter could be placed into reverse.

2. Selecting "Field Service Mode" on the scanner or grounding the diagnostic "test" terminal at the DLC with the ignition "ON" and engine not running, will de-energize the reverse lockout solenoid indicating normal system operation.

NOTICE: Do Not keep the diagnostic "test" terminal grounded for more than 1 minute as damage could result to ECM driven solenoids.

3. Raise the vehicle enough to gain access to the reverse lockout solenoid electrical harness and still be able to turn the ignition "ON."

4. Disconnecting the ECM will determine if the ECM is internally shorted or CKT 1652 is shorted to ground causing the reverse lockout solenoid to be enabled.