Od (Overdrive) Off Switch

The OD (Overdrive) OFF switch is located to the right of steering column, on the instrument panel. The OD OFF switch controls the overdrive operation by delivering an input signal to the PCM. The PCM uses this signal for controlling the operation of the overdrive solenoid on the valve body.

When overdrive switch is in the OFF position, OD light on the instrument panel will be illuminated and transmission will not upshift into 4th gear for overdrive operation. When OD switch is in the ON position, OD light on the instrument panel will be not be illuminated and transmission will upshift into 4th gear for overdrive operation.

If OD switch is in the ON position, the TCC will lock-up once transmission is in 4th gear with vehicle speed greater than 45 MPH. If overdrive switch is in the OFF position, the TCC will lock-up once transmission is in 3rd gear with vehicle speed greater than 35 MPH at light throttle application.