Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 761

35B-14
Code No.81 Steering wheel sensor (ST-1) system (open
circuit or short circuit)
Code No.82 Steering wheel sensor (ST-2) system (open
circuit or short circuit)
Code No.83 Steering wheel sensor (ST-N) system (open
circuit or short circuit)
These codes are output if there is a fault in the steering wheel sensor, an open circuit
or short circuit in the steering signal line, or the internal circuit in the hydraulic unit
and ABS-ECU is defective.
Are the diagnosis code Nos.81, 82 and
83 output at the same time?
NO
Is the ACD system diagnosis code
No.31 output at the same time?
NO
Check the following connectors:
C-133, C-228, B-109
NG
OK
Check the trouble Repair
symptom.
NG
Check the harness wire.
D Between ABS-ECU and steering
wheel sensor
OK
NG
Repair
Measure at the steering wheel sensor connector C-230.
D Connect the connector and measure by turning the steering wheel laterally in the neutral
position.
D Ignition switch: ON
(1) Voltage between 1 and body earth
(2) Voltage between 4 and body earth
(3) Voltage between 5 and body earth
OK: Refer to the figure below
Variations in voltage when turning the steering wheel laterally
Voltage
2.7 - 4.4 V
0.8 - 2.1 V
ABS <4WD> -
YES
Check the following connectors:
B-123, C-128 <L.H. drive vehicles>,
C-147 <R.H. drive vehicles>, C-230
YES
Check the trouble symptom.
Measure at the steering wheel sensor
connector C-230.
D Disconnect the connector, and
measure at the harness side
connector.
(1) Voltage between 2 and body earth
(Ignition switch: ON)
OK: System voltage
(2) Continuity between 3 and body earth
OK: Continuity
Check the harness wire.
D Between ABS-ECU and steering
wheel sensor
OK
Troubleshooting
Probable cause
D Malfunction of steering wheel sensor
D Malfunction of wiring harness or connector
D Malfunction of hydraulic unit and ABS-ECU
NG
OK
NG
(1) NG
(2) NG
OK
NG
Repair
OK
NG
Time
Repair
Check the following connectors:
C-102, C-209, C-210, C-230
NG
OK
Check the trouble Repair
symptom.
NG
Check the harness wire, and repair if
necessary.
D Betweenignitionswitch andsteering
wheel sensor
Check the following connectors:
C-08, C-230
NG
OK
Repair
Check the trouble
symptom.
NG
Check the harness wire, and repair if
necessary.
D Between steering wheel sensor and
body earth
Replace the hydraulic unit and ABS-
ECU.
Replace the steering wheel sensor.