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Home >> Nissan-Datsun >> 2002 >> Sentra CA (Clean Air) L4-1.8L (QG18DE) >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> TCM Self-Diagnosis Does Not Activate

TCM Self-Diagnosis Does Not Activate

21. 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 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.

DIAGNOSTIC PROCEDURE
1. CHECK PNP SWITCH CIRCUIT (WITH CONSULT-II)
With CONSULT-II
1. Turn ignition switch to "ON" position. (Do not start engine.)
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.





3. Read out "PN", "R", "D", "2" and "1" Position switches moving selector lever to each position. Check that the signal of the selector lever position is indicated properly.
OK or NG
OK >> GO TO 3.
NG >> Check the following items:
- PNP switch.
- Harness for short or open between ignition switch and PNP switch (Main harness)
- Harness for short or open between PNP switch and TCM (Main harness)

2. CHECK PNP SWITCH CIRCUIT (WITHOUT CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to "ON" position. (Do not start engine.)








2. Check voltage between TCM terminals 26, 27, 34, 35, 36 and ground while moving selector lever through each position.
Voltage B: Battery voltage O: OV
OK or NG
OK >>GO TO 4.
NG >> Check the following items:
- PNP switch.
- Harness for short or open between ignition switch and PNP switch (Main harness)
- Harness for short or open between PNP switch and TCM (Main harness)

3. CHECK OVERDRIVE CONTROL SWITCH CIRCUIT (WITH CONSULT-II)
With CONSULT-II
1. Turn ignition switch to "ON" position. (Do not start engine.)
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.





3. Read out "OVERDRIVE SW".
Check the signal of the overdrive control switch is indicated properly. (Overdrive control switch "ON" displayed on CONSULT-II means overdrive "OFF".)
OK or NG
OK >> GO TO 5.
NG >> Check the following items:
- Overdrive control switch.
- Harness for short or open between TCM and over drive control switch (Main harness)
- Harness of ground circuit for overdrive control switch (Main harness) for short or open

4. CHECK OVERDRIVE CONTROL SWITCH CIRCUIT (WITHOUT CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to "ON" position. (Do not start engine.)





2. Check voltage between TCM terminal 22 and ground when overdrive control switch is "ON" and "OFF".
Voltage
- Switch position "ON": Battery voltage
- Switch position "OFF": 1V or less
OK or NG
OK >> GO TO 6.
NG >> Check the following items:
- Overdrive control switch.
- Harness for short or open between TCM and over drive control switch (Main harness)
- Harness of ground circuit for overdrive control switch (Main harness) for short or open

5. CHECK THROTTLE POSITION SWITCH CIRCUIT (WITH CONSULT-II)
With CONSULT-II
1. Apply vacuum to the throttle opener, then check the following. Refer to step 1 through 5 of "TCM Self-diagnostic Procedure (No Tools)", "TCM Self-diagnostic Procedure (No Tools)".
2. Turn ignition switch to "ON" position. (Do not start engine.)
3. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.





4. Read out "CLOSED THL/SW" and "W/O THRL/P-SW" depressing and releasing accelerator pedal. Check the signal of throttle position switch is indicated properly.
OK or NG
OK >> GO TO 7.
NG >> Check the following items:
- Throttle position switch.
- Harness for short or open between ignition switch and throttle position switch (Main harness)
- Harness for short or open between throttle position switch and TCM (Main harness)

6. CHECK THROTTLE POSITION SWITCH CIRCUIT (WITHOUT CONSULT-II)
Without CONSULT-II
1. Apply vacuum to the throttle opener, then check the following. Refer to step 1. through 5 of "TCM Self-diagnostic Procedure (No Tools)", "TCM Self-diagnostic Procedure (No Tools)".
2. Turn ignition switch to "ON" position. (Do not start engine.)








3. Check voltage between TCM terminals 16, 17 and ground while depressing, and releasing accelerator pedal slowly. (After warming up engine)
OK or NG
OK >> GO TO 7.
NG >> Check the following items:
- Throttle position switch.
- Harness for short or open between ignition switch and throttle position switch (Main harness)
- Harness for short or open between throttle position switch and TCM (Main harness)

7. CHECK DTC
Perform "DIAGNOSTIC PROCEDURE"
OK or NG
OK >> INSPECTION END
NG >>
- Perform TCM input/output signal inspection.
- If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

COMPONENT INSPECTION
Overdrive Control Switch








- Check continuity between terminals 1 and 2.

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 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 (PNP) Switch Adjustment".
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. Refer to "Preparation", "TCM Self-diagnostic Procedure (No Tools)", "TCM Self-diagnostic Procedure (No Tools)".
- To adjust closed throttle position switch, refer to"DTC P0510 CTP SWITCH" [QG18DE (except Calif. CA Model)] or "DTC P0510 CTP SWITCH" [QG18DE (Calif. CA Model)].
Wide open throttle position switch








- Check continuity between terminals 4 and 5.

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