A/T Check Indicator Lamp Does Not Come On

A/T CHECK Indicator Lamp does not come on

SYMPTOM: A/T CHECK indicator lamp does not come on for about 2 seconds when turning ignition switch to ON.

DIAGNOSTIC PROCEDURE
1. CHECK CAN COMMUNICATION LINE
Execute the self-diagnosis.
Is a malfunction in the CAN communication indicated in the results?
YES >> Check the CAN communication line. Refer to DTC U1000 CAN COMMUNICATION LINE.
NO >> GO TO 2.

2. CHECK TCM POWER SOURCE
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector terminals and ground. Refer to Wiring Diagram - AT-POWER.








3. Turn ignition switch OFF.





4. Check voltage between TCM connector terminals and ground. Refer to Wiring Diagram - AT-POWER.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.

3. DETECT MALFUNCTIONING ITEM
Check the following items:
^ Harness for short or open between battery and TCM connector terminal 9
^ Harness for short or open between ignition switch and TCM connector terminals 33 and 42
^ 10A fuse [No. 32 or 35, located in the fuse block (J/B)]
^ Ignition switch, Refer to POWER SUPPLY ROUTING.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.

4. CHECK TCM GROUND CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect the TCM connector.
3. Check continuity between terminals 5 (B), 14 (B), 24 (B), 46 (B) and ground. Refer to Wiring Diagram - AT-POWER.
Continuity should exist.
4. If OK, check the harness for short-circuit to ground or the power source.
OK or NG
OK >> GO TO 5.
NG >> Repair the short-circuit in the harness or connector to ground or the power source.

5. CHECK A/T CHECK INDICATOR LAMP CIRCUIT
1. Turn ignition switch OFF.
2. Check the combination meter.
Refer to COMBINATION METERS. Combination Meters
OK or NG
OK >> GO TO 6.
NG >> Replace the combination meter. Refer to Removal and Installation of Combination Meter.

6. CHECK SYMPTOM
Check again. Refer to Check Before Engine is Started.
OK or NG
OK >> INSPECTION END
NG >> GO TO 7.

7. CHECK TCM
1. Check TCM input/output signal. Refer to TCM Input/Output Signal Reference Values.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.