MIL Does Not Come on

INHIBITOR, OVERDRIVE AND THROTTLE POSITION SWITCH CIRCUIT CHECKS













DIAGNOSTIC CHART

PARTS DESCRIPTION




Inhibitor switch
Detects the selector lever position and sends a signal to the A/T control unit.




Overdrive switch
Detects the overdrive switch position (ON or OFF) and sends a signal to the A/T control unit.




Throttle position switch
Consists of a wide-open throttle position switch and a closed throttle position switch. The wide-open position switch sends a signal to the A/T control unit when the throttle valve is open at least 1/2 of the full throttle position. The closed throttle position switch sends a signal to the A/T control unit when the throttle valve is fully closed.

OVERALL FUNCTION CHECK




CONSULT
1) Start engine.
2) Select "SELF-DIAG RESULTS" mode for ECM with CONSULT.
3) Drive vehicle under the following conditions: Selector lever in D, OD control switch in "OFF" position, vehicle speed higher than 10 km/h (6 MPH), throttle opening greater than 1/2 of the full throttle position and driving for more than 5 seconds.

OR




GENERIC SCAN TOOL
1) Start engine.
2) Drive vehicle under the following conditions: Selector lever in D, OD control switch in "OFF" position, vehicle speed higher than 10 km/h (6 MPH), throttle opening greater than 1/2 of the full throttle position and driving for more than 5 seconds.
3) Select "MODE 3" with GST.

OR

NO TOOLS
1) Start engine.
2) Drive vehicle under the following conditions: Selector lever in D, OD control switch in "OFF" position, vehicle speed higher than 10 km/h (6 MPH), throttle opening greater than 1/2 of the full throttle position and driving for more than 5 seconds.
3) Perform self-diagnosis for ECM.