REAR AXLE – Troubleshooting <AYC>
27-21
INSPECTION PROCEDURE 2
Communication between MUT-II and the AYC-ECU is not
possible.
Probable cause
The cause may be a malfunction of the AYC-ECU power supply circuit or an open
circuit in the diagnosis output circuit.
D Blown fuse
D Defective harness or connector
D Defective AYC-ECU
NG
Check and repair the harness between
AYC-ECU and diagnosis connctor.
OK
Check the trouble symptom.
OK
Check the following symptom.
NG
Check and repair the harness between
ignition switch (IG
2
) and AYC-ECU.
OK
Check the trouble symptom.
OK
Replace AYC-ECU.
Check the following connectors:
B-96, B-94, B-49, B-75, B-76
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 Voltage across 31 and body ground
OK: System voltage
NG
Measure at B-22 diagnosis connector
and B-95 AYC-ECU connector.
D Disconnect the connectors and
measure at the harness side.
D Continuity across 1 of B-22 and
10 of B-95
D Continuity across 7 of B-22 and
23 of B-95
OK: Conducting
NG
Check the following connectors:
B-95, B-65, B-22
NG
Repair
OK
Measure at B-95 and B-96 AYC-ECU
connectors.
D Disconnect the connectors and
measure at the harness side.
D Continuity across 26/46 and body
ground
OK: Conducting
NG
Check the following connectors:
B-95, B-96
NG
Replace
Check and repair the harness between
AYC-ECU and earth.
NG
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