Overdrive Switch: Testing and Inspection

O/D Main Switch & O/D OFF Indicator Light Circuit

CIRCUIT DESCRIPTION
The O/D main switch contacts go off when the switch is pushed in and comes on when it is pushed out. In O/D main switch OFF position, the O/D OFF indicator lights up, and the ECM prohibits shifting to overdrive. The ECM also causes the O/D OFF indicator light to blink when a malfunction is detected. In this case, connecting the terminals in the DLC2 or DLC1 can display the malfunction code.





WIRING DIAGRAM

INSPECTION PROCEDURE














O/D OFF indicator light does not light up.








O/D OFF indicator light remains ON

O/D OFF indicator light blinks
Perform DTC Inspection.