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




- PNP switch
The 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.

Terminals 3 Thru 30:

Terminals 37 Thru 45:

TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.

Part 1 Of 3:

Part 2 Of 3:

Part 3 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 (1) and (2), (3), (4), (5), (6), (7) while moving manual shaft through each position.




2. If NG, check again with manual control cable disconnected from manual shaft of A/T assembly.
3. If OK on step 2, adjust manual control cable.




4. If NG on step 2, remove PNP switch from A/T and check continuity of PNP switch terminals.
5. If OK on step 4, adjust PNP switch.
6. If NG on step 4, replace 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 Basic Inspection.







WIDE OPEN THROTTLE POSITION SWITCH
- Check continuity between terminals (4) and (5).