REAR AXLE –
Troubleshooting <AYC>
27-18
Code No. 82: Electric pump system
Probable cause
This code is output if the pressure switch is not set to high-pressure position despite
the AYC-ECU’s command to drive the AYC relay for a given period of time.
D
Low hydraulic oil level
D
Oil leak
D
Defective fusible link
D
Defective AYC relay
D
Defective harness or connector
D
Defective AYC motor
D
Defective accumulator pressure switch
D
Defective AYC-ECU
OK
Replace AYC-ECU.
Check the harness
between AYC relay and
AYC motor, and between
AYC motor and body
ground.
NG
Replace
NG
OK
Check the trouble symptom.
OK
Check the following
connectors:
A-126, B-94, B-27, F-32
NG
Repair
OK
Replace AYC-ECU.
NG
Check the harness
between AYC-ECU and
accumulator pressure
switch.
NG
Repair
NG
Check and repair the har-
ness between fusible link
no. 10 and AYC relay.
OK
Check the trouble symp-
tom.
OK
Replace the hydraulic unit
for a defective accumula-
tor pressure switch.
NO
Repair the leak.
OK
Check the trouble symptom.
NG
Check the following
connector: A-126
NG
Repair
YES
Add hydraulic oil.
Is the hydraulic oil level correct in the reservoir tank?
(Refer to P.27-33.)
NO
Is there a hydraulic oil leak?
Measure at A-126 AYC relay connector.
D
Disconnect the connector and measure at the harness side.
D
Voltage across 5 and body ground
OK: System voltage
NG
NO
MUT-
II
Actuator test:
No. 12 Electric pump operation check
OK: Pump operation sounds are heard
OK
Measure at F-31 accumulator pressure switch connector.
D
Disconnect the connector and measure at the harness side.
D
Ignition switch: ON
D
Voltage across 2 and body ground
OK: System voltage
YES
Is diagnosis code no. 81 output?
YES
Check the AYC relay system. (Refer to P.27-17.)
NG
Check the following
connectors: B-95, B-94,
D-06, F-30, F-31
NG
Repair
OK
D
Check AYC relay for
continuity.
(Refer to P.27-42.)
D
Check AYC motor for
operation.
NG
Repair