Mitsubishi Lancer Evolution IV, Workshop Manual

Page: 204 / 391

REAR AXLE –
Troubleshooting <AYC>
27-21
5. INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom Inspection
procedure No. Ref. page
AYC warning lamp does not light up when the ignition key is turned to “ON” (engine
stationary). 1 27-21
AYC warning lamp remains lit up after the engine has started. 2 27-22
AYC is inoperative.
Unable to start or accelerate on slippery road surfaces. 3 27-22
Rear tires are noisy during low-speed cornering.
Vehicle skews. 4 27-23
6. INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
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: Battery voltage
NG
Check the following connectors:
B-08, B-74, B-76
NG
Repair