Mitsubishi LANCER EVOLUTION-IV 1998, Workshop Manual, Page: 386 / 526

REAR AXLE –
Troubleshooting <AYC>
27-20
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: Battery 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.27-15.)
D
Check the directional control valve
(right) system (code no. 72).
(Refer to P.27-16.)
D
Check the directional control valve
(left) system (code no. 73).
(Refer to P.27-17.)
(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.27-52.)
NG
Repair