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.

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 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 PNP switch from A/T and check continuity of PNP switch terminals. Refer to step 1.
5. If OK on step 4, adjust PNP switch. Refer to Park/Neutral Position Switch Adjustment.
6. If NG on step 4, replace PNP switch.




Throttle position switch




Closed throttle position switch (idle position)
- Check continuity between terminals (2) and (3).
- To adjust closed throttle position switch, refer to ("Basic Inspection", "TROUBLE DIAGNOSIS - Basic Inspection").







Wide open throttle position switch
- Check continuity between terminals (1) and (2).