AT Check Indicator Lamp Does Not Come On

AT CHECK Indicator Lamp does not come on

TCM INPUT/OUTPUT SIGNAL REFERENCE VALUES
Refer to AT-86, "TCM Input/Output Signal Reference Values". Pinout Values and Diagnostic Parameters

SYMPTOM: AT 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. Refer to AT-89, "SELF-DIAGNOSTIC RESULT MODE". Self-Diagnostic Result Mode
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT-95, "DTC U1000 CAN COMMUNICATION LINE". U1000
NO >> GO TO 2.

2. CHECK A/T CHECK INDICATOR LAMP CIRCUIT
Check the combination meter.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.

3. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT-169, "MAIN POWER SUPPLY AND GROUND CIRCUIT". Main Power Supply and Ground Circuit
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.