Beginning With VIN #343314
TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks)SYMPTOM: O/D OFF indicator lamp does not come on in TCM self-diagnostic procedure even the lamp circuit is good.
DESCRIPTION
- PNP switch The PNP switch assembly includes a transmission range switch.
The transmission range switch detects the selector 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 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.
DIAGNOSTIC PROCEDURE
NOTE: The diagnostic procedure includes inspections for the overdrive control and throttle position switch circuits.
COMPONENT INSPECTION
Overdrive Control Switch
- Check continuity between terminals 5 and 6.
Continuity:
Switch position ON: No
Switch position OFF: Yes
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 linkage disconnected from manual shaft of A/T assembly. Refer to step 1.
3. If OK on step 2, adjust manual control linkage. Refer to Automatic Transmission/Transaxle; Shift Linkage, A/T.
Shift Linkage
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 Powertrain Management; Computers and Control Systems; Transmission Position Switch.
Transmission Position Sensor/Switch
6. If NG on step 4, replace PNP switch.
Throttle Position Switch
Closed Throttle Position Switch (Idle Position)
- Check continuity between terminals 4 and 5. Refer to TCM Self-Diagnosis Procedure (No Tools). TCM Self-Diagnostic Procedure (No Tools)
Wide Open Throttle Position Switch
- Check continuity between terminals 5 and 6.