REAR AXLE – Troubleshooting <AYC>
27-22
INSPECTION PROCEDURE 2
AYC warning lamp remains lit up after the engine has
started.
Probable cause
The AYC warning lamp ON circuit is probably short-circuited. D Defective combination meter
D Defective harness (short-circuit)
D Defective AYC-ECU
NOTE
This symptom is limited only when AYC-ECU power supply is in normal condition and the diagnosis
code is correct.
OK
Replace combination meter.
NO
Check the harness between AYC
warning lamp and AYC-ECU.
NG
Repair
Does the AYC warning lamp goes out
when the B-96 AYC-ECU connector
is disconnected?
YES
Replace AYC-ECU.
INSPECTION PROCEDURE 3
AYC is inoperative.
Unable to start or accelerate on slippery road surfaces.
Probable cause
The hydraulic oil level is probably low, there is an oil leak, the hydraulic unit is defective,
or the torque transfer differential is defective.
D Low hydraulic oil level
D Oil leak
D Defective hydraulic unit
D Defective torque transfer differential
NOTE
This symptom is limited only when the diagnosis code is correct.
NG
Replace the hydraulic unit.
NG
Replace the torque transfer differential.
Check the trouble symptom.
NG
Replace AYC fluid.
OK
Correct
Check the trouble symptom.
NO
Replace the torque transfer differential.
OK
Is foreign matter trapped in the hydrau-
lic line?
YES
Repair
OK
Check the AYC for operation.
OK
Check the AYC fluid.
NG
Add hydraulic oil.
NG
Check hydraulic pressure.
NG
Bleed the system of air.
Check the hydraulic oil level.
NG
Check for oil leak.
OK
Repair
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