Mitsubishi Lancer Evolution IX. Manual — part 511
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TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-75
Code No.81: Steering Wheel Sensor (ST-1) System
Code No.82: Steering Wheel Sensor (ST-2) System
Code No.83: Steering Wheel Sensor (ST-N) System
OPERATION
The steering wheel sensor monitors the steering
angle and sends the ST-1, ST-2 and ST-N signals.
The ABS-ECU calculates the steering angle by read-
ing the signals from the steering wheel sensor.
DIAGNOSIS CODE SET CONDITIONS
Diagnosis code No.81 (ST-1), No.82 (ST-2) and
No.83 (ST-N) are set if there is a fault in the steering
wheel sensor, an open circuit or short circuit in the
signal lines, or the internal circuit in the hydraulic unit
and ABS-ECU is defective.
IGNITION
SWITCH (IG2)
STEERING
WHEEL
SENSOR
ABS-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue
W : White Y : Yellow SB : Sky blue BR : Brown
O : Orange GR : Gray R : Red P : Pink V : Violet
Steering Wheel Sensor Circuit
ST-1
ST-2
ST-N
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TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-76
PROBABLE CAUSES
The most likely causes for these diagnosis codes to
set are:
• Malfunction of the steering wheel sensor
• Damaged wiring harness and connector
• Malfunction of the brake modulator hydraulic unit
(integrated with ABS-ECU)
DIAGNOSIS
STEP 1. M.U.T.-II/III data list.
CAUTION
To prevent damage to M.U.T.-II/III, always turn the
ignition switch to the "LOOK" (OFF) position
before connecting or disconnecting M.U.T.-II/III.
(1) Connect M.U.T.-II/III as shown in the illustration.
(2) Start the engine.
(3) Set M.U.T.-II/III to data reading mode for following
items.
• Item No.74: Steering wheel (ST−N)
• Item No.75: Steering wheel (ST−1)
• Item No.76: Steering wheel (ST−2)
OK:
Q: Is the steering wheel sensor input normal?
YES :
This malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to Cope With Intermittent Malfunction
.
NO :
Go to Step 2.
AC311157
Steering shaft
AB
MB991502
<Using the M.U.T.-II>
AC311153
AB
MB991911
16-PIN
MB991827
MB991824
<Using the M.U.T.-III>
Item
No.
Check item
Checking
requirement
Display
74
Steering
wheel sensor
(ST-N)
Steering: Neutral
position and
position near by
± 360°
ON
Steering: Except
for above
OFF
75
Steering
wheel sensor
(ST-1)
Steering: Turn
laterally slowly.
Display
ON and
OFF
alternately
76
Steering
wheel sensor
(ST-2)
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TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-77
STEP 2. Check the power supply circuit. Voltage
measurement at steering wheel sensor
connector C-230.
(1) Disconnect connector C-230, and check at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 and
earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Go to Step 4.
STEP 3. Check the earth circuit. Resistance
measurement at steering wheel sensor
connector C-230.
(1) Disconnect connector C-230, and check at the
harness side.
(2) Measure the resistance between terminal 3 and
earth.
OK: 2 ohms or less
Q: Is the resistance 2 ohms or less?
YES :
Go to Step 8.
NO :
Go to Step 6.
AC311195AB
Connector: C-230
Connector C-230
(Harness side)
5 4
1
2
3
AC311195AC
Connector: C-230
Connector C-230
(Harness side)
5 4
1
2
3
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TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-78
STEP 4. Check the following connectors.
•
Steering wheel sensor connector C-230
•
Junction block connectors C-210, C-211
•
Joint connector C-101
Check the connectors for loose, corroded or dam-
aged terminals, or terminals pushed back in the con-
nector.
Q: Are the connectors and terminals in good
condition?
YES :
Go to Step 5.
NO :
Repair it and then go to Step 11.
STEP 5. Check the following harness wire.
The wire between steering wheel sensor connector
C-230 (terminal 2) and junction block connector
C-211 (terminal 2)
Q: Is the harness wire damaged?
YES :
Repair or replace it and then go to Step 11.
NO :
Go to Step 11.
AC311196AB
Connector: C-230
Harness side
5 4
1
2
3
AC311164
Connectors: C-210, C-211
C-210
C-211
AB
Junction block
(Front view)
Connector C-210
(Harness side)
4
6 5
3
2
1
10
1
6
14
5
12
13
4
11
7
2
3
8
9
Connector C-211
(Harness side)
AC311161AE
Connector: C-101
C-101 (L)
2
1
3
13
12
14
21
10
5
4
6
16
15
17
7 8 9
19
18
20
11
22
AC311196AB
Connector: C-230
Harness side
5 4
1
2
3
AC311165
Connector: C-211
AB
Junction block
(Front view)
Harness side
4
6 5
3
2
1
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