Diagnostic Procedure 21

SYMPTOM: O/D OFF indicator lamp does not come on in TCM self-diagnostic procedure even if the lamp circuit is good.










DESCRIPTION
- Park/neutral position (PNP) switch
The park/neutral position (PNP) switch assembly includes a transmission range switch.The transmission range switch detects the selector lever position and sends a signal to the TCM.
- Overdrive control switch
Detects the overdrive control switch position (ON or OFF) and sends a signal to the TCM.
- Throttle position switch
Consists of a wide open throttle position switch and a closed throttle position switch.
The wide open throttle position switch sends a signal to the TCM 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 TCM when the throttle valve is fully closed.

Part 1 Of 3:

Part 2 Of 3:

DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION







Overdrive control switch
- Check continuity between two terminals.










Park/Neutral Position (PNP) switch
1. Check continuity between terminals 1 and 2 and between terminals 3 and 4, 5, 6, 7, 8, 9 while moving manual shaft through each position.
2. If NG, check again with manual control cable disconnected from manual shaft of A/T assembly. Refer to step 1.
3. If OK on step 2, adjust manual control cable.
4. If NG on step 2, remove park/neutral position (PNP) switch from A/T and check continuity of park/neutral position (PNP) switch terminals. Refer to step 1.
5. If OK on step 4, adjust park/neutral position (PNP) switch.
6. If NG on step 4, replace park/neutral position (PNP) switch.







Throttle position switch
Closed throttle position switch (idle position)
- Check continuity between terminals 5 and 6.
- To adjust closed throttle position switch, refer to Powertrain Management; Throttle Position Switch.







Wide open throttle position switch
Check continuity between terminals 4 and 5.