Mitsubishi Lancer Evolution VI. Manual — part 56
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
REAR AXLE –
Troubleshooting <AYC>
27-19
Code No. 83: Electric pump system
Probable cause
This code is output if the pressure switch is not set to low-pressure position despite
the AYC-ECU’s command to change the driving force.
D
Defective accumulator pressure switch
D
Defective harness or connector
OK
Replace AYC-ECU.
NG
Check the harness between AYC-ECU
and accumulator pressure switch.
NG
Repair
OK
Check the trouble symptom.
NG
Check and repair the harness between
accumulator pressure switch and body
ground.
OK
Check the trouble symptom.
(2) NG
Check the following connectors:
F-31, F-30
NG
Repair
NO
Measure at F-31 accumulator pressure
switch connector.
D
Disconnect the connector and
measure at the harness side.
D
Ignition switch: ON
(1) Voltage across 2 and body ground
OK: System voltage
(2) Continuity across 1 and body
ground
OK: Conducting
OK
Replace the hydraulic unit for a defec-
tive accumulator pressure switch.
OK
Check and repair the harness between
AYC relay and AYC motor.
NO
Is diagnosis code no. 71, 72, or 73
output?
YES
D
Check the proportioning valve
system (code no. 71).
(Refer to P.27-14.)
D
Check the directional control valve
(right) system (code no. 72).
(Refer to P.27-15.)
D
Check the directional control valve
(left) system (code no. 73).
(Refer to P.27-16.)
(1) NG
Check the following connectors:
B-95, B-94, D-06, F-30, F-31
NG
Repair
Does the AYC motor continue turning
when the ignition switch is turned ON?
YES
Check the AYC relay for continuity.
(Refer to P.27-42.)
NG
Repair
REAR AXLE –
Troubleshooting <AYC>
27-20
5. INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Inspection
procedure No.
Ref. page
Communication between MUT-
II
and the whole system is not possible.
1
27-20
Communicatio between MUT-
II
and AYC-ECU is not possible.
2
27-21
AYC warning lamp does not light up when the ignition key is turned to “ON” (engine
stationary).
3
27-22
AYC warning lamp remains lit up after the engine has started.
4
27-23
AYC is inoperative.
Unable to start or accelerate on slippery road surfaces.
5
27-23
Rear tires are noisy during low-speed cornering.
Vehicle skews.
6
27-24
6. INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
Communication between MUT-
II
and the whole system is
not possible.
Probable cause
The cause may be a malfunction of the power supply circuit or the ground circuit
of the diagnosis connector.
D
Defective diagnosis connector
D
Defective harness or connector
NG
Check and repair the harness between
power supply and diagnosis connector.
OK
Check the trouble symptom.
NG
Check and repair the harness between
body ground and diagnosis connector.
OK
Check the trouble symptom.
OK
Replace MUT-
II
.
Check the following connectors:
B-22, B-50
NG
Repair
OK
Measure at B-22 diagnosis connector.
D
Disconnect the connector and
measure at the harness side.
D
Continuity across 4/5 and body
ground
OK: Conducting
NG
Measure at B-22 diagnosis combina-
tion meter connector.
D
Voltage across 16 and body ground
OK: System voltage
NG
Check the following connectors:
B-22, B-49, B-75, B-73
NG
Repair
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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