REAR AXLE – Troubleshooting <AYC>
27-22
INSPECTION PROCEDURE 3
AYC warning lamp does not light up when the ignition key
is turned to “ON” (engine stationary).
Probable cause
The lamp power supply circuit is probably open-circuited, lamp bulb is out, or the
circuit between AYC warning lamp and AYC-ECU or AYC-ECU itself is defective.
D Blown fuse
D AYC warning lamp out
D Defective harness or connector
D Defective AYC-ECU
NG
Check and repair the harness between
ignition switch (IG
2
) and AYC warning
lamp.
OK
Check the trouble symptom.
OK
Replace combination meter.
NG
Check the harness between AYC
warning lamp and AYC-ECU.
NG
Repair
OK
Check the trouble symptom.
OK
Replace AYC-ECU.
OK
Check the following connectors:
B-96, B-94, B-08
NG
Repair
OK
Measure at B-96 AYC-ECU connector.
D Disconnect the connector and
measure at the harness side.
D Ignition switch: ON
D Warning lamp when 36 is grounded
to body
OK: Lit up
NG
Check the lamp bulb.
NG
Replace
Measure at B-08 combination meter
connector.
D Disconnect the connector and
measure at the harness side.
D Ignition switch: ON
D Voltage across 48 and body ground
OK: Symptom voltage
NG
Check the following connectors:
B-08, B-74, B-76
NG
Repair
To Next Page
