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 or No
Yes >> Check the CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE" Transmission Control Systems
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". AT-POWER





3. Turn ignition switch "OFF".
4. Check voltage between TCM connector terminals and ground. Refer to "Wiring Diagram-AT-POWER". 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. Power Supply Routing Circuit Schematic

OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.

4. CHECK TCM GROUND CIRCUIT
1. Turn ignition switch to "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". AT-POWER
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(s) in the harness or connector to ground or the power source.

5. CHECK A/T CHECK INDICATOR LAMP CIRCUIT
1. Turn ignition switch to "OFF".
2. Check the combination meter. Combination Meters

OK or NG
OK >> GO TO 6.
NG >> Replace the combination meter.

6. CHECK SYMPTOM
Check again.

OK or NG
OK >> INSPECTION END
NG >> GO TO 7.

7. PERFORM TCM INSPECTION
1. Perform TCM input/output signal inspection.
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.