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
Perform 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".
NO >> GO TO 2.

2. CHECK TCM POWER SOURCE CIRCUIT
1. Turn ignition switch "ON". (Do not start engine.)








2. Check voltage between TCM connector terminals and ground. Refer to "Wiring Diagram-AT-PWR/IN".
3. Turn ignition switch "OFF".





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

3. DETECT MALFUNCTIONING ITEM
Check the following:
^ Harness for short or open between battery and TCM terminal 27
^ Harness for short or open between ignition switch and TCM terminals 1, 34, 38 and 39
^ 10A fuse [No. 19, located in the fuse block (J/B) or No. 48, located in the IPDM E/R]
^ Ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT".
^ A/T PV ION relay. Refer to "Component Inspection".
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 harness connector.
3. Check continuity between TCM terminals 14 (B), 48 (B) and ground. Refer to "Wiring Diagram-AT-PWR/IN".
4. If OK, check harness for short-circuit to ground or the power source.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.

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

6. SYMPTOM CHECK
Check again.
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.