Overdrive Off Indicator Inoperative
Overdrive Off Indicator Inoperative
Circuit Description
With the ignition switch in the ON position, voltage is applied through the 10A Gage Fuse to the OD/OFF indicator light. Whenever the overdrive switch, located on the shifter, is released to the off position, system voltage is applied through the closed contacts of the overdrive switch to ground. When this occurs, the OD/OFF indicator light in the instrument cluster will light and the powertrain control module (PCM) will simultaneously receive a low voltage signal at the O/D On/Off input. With a low voltage input, the PCM will disable the overdrive function. Whenever the overdrive switch is depressed to the on position, the overdrive switch opens. When this occurs, the O/D/OFF Indicator light in the instrument cluster will go out and the PCM will simultaneously receive a high voltage signal at the O/D On/Off input. With a high voltage input, the PCM will enable the overdrive function and the transaxle is permitted to shift into overdrive when appropriate.
Diagnostic Aids
Inspect for the following conditions:
* Open GAGE Fuse
* Poor connections at any in line harness connectors
* Loose ground connections
An intermittent may be caused by the following conditions:
* A poor connection
* Rubbed through wire insulation
Inspect the wiring. If any wiring repairs are necessary, refer to Repair Procedures.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
2. This step checks the O/D OFF indicator light by jumping the switch to ground.
3. This step checks the ground circuit and the Overdrive switch.
4. This step checks for an open LT GRN wire or an open indicator bulb.
