Mitsubishi Lancer Evolution IX. Manual — part 504
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-47
DIAGNOSTIC TROUBLE CODE
PROCEDURES <R.H. drive vehicle>
Code No.11: Front Right Wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.12: Front Left Wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.13: Rear Right Wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.14: Rear Left Wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.21: Front Right Wheel Speed Sensor System
Code No.22: Front Left Wheel Speed Sensor System
Code No.23: Rear Right Wheel Speed Sensor System
Code No.24: Rear Left Wheel Speed Sensor System
OPERATION
• A toothed wheel speed rotor generates a voltage
pulse as it moves across the pickup field of each
wheel speed sensor.
• The amount of voltage generated at each wheel
is determined by the clearance between the
wheel speed rotor teeth and the wheel speed
sensor, and by the speed of rotation.
• The wheel speed sensors transmit the frequency
of the voltage pulses and the amount of voltage
generated by each pulse to the ABS-ECU.
ABS-ECU
(FRONT: LH)
(FRONT: RH)
(REAR: LH)
(REAR: RH)
WHEEL SPEED SENSOR
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
Wheel Speed Sensor Circuit
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-48
• The hydraulic unit modulates the amount of brak-
ing force individually applied to each wheel cylin-
der.
DIAGNOSIS CODE SET CONDITIONS
• Diagnosis codes 11, 12, 13, 14 are set when sig-
nal is not input due to breakage of the wires of
one or more of the four wheel speed sensors.
• Diagnosis codes 21, 22, 23, 24 are set in the fol-
lowing cases:
• Open circuit is not found but no input is
received by one or more of the four wheel
speed sensors at 10 km/h (6 mph) or more.
• Sensor output drops due to a malfunctioning
wheel speed sensor or warped wheel speed
rotor.
PROBABLE CAUSES
The most likely causes for these diagnosis codes to
set are:
Diagnosis codes 11, 12, 13, 14
• Malfunction of the wheel speed sensor
• Damaged wiring harness or connector
• Malfunction of the brake modulator hydraulic unit
(integrated with ABS-ECU)
Diagnosis codes 21, 22, 23, 24
• Malfunction of the wheel speed sensor
• Damaged wiring harness or connector
• Malfunction of the brake modulator hydraulic unit
(integrated with ABS-ECU)
• Malfunction of the wheel speed rotor
• Malfunction of the wheel bearing
• Excessive clearance between the wheel speed
sensor and wheel speed rotor
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 the data reading mode, and
AC311157
Steering shaft
AB
MB991502
<Using the M.U.T.-II>
AC311153
AB
MB991911
16-PIN
MB991827
MB991824
<Using the M.U.T.-III>
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-49
check the data list items by driving the vehicle.
• Item 11 (diagnosis code 11 or 21 is set): Front
right wheel speed sensor
• Item 12 (diagnosis code 12 or 22 is set): Front
left wheel speed sensor
• Item 13 (diagnosis code 13 or 23 is set): Rear
right wheel speed sensor
• Item 14 (diagnosis code 14 or 24 is set): Rear
left wheel speed sensor
OK: The reading on the speedometer
nearly matches the indication on
M.U.T.-II/III, when driving.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the wheel speed 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.
STEP 2. Check the wheel speed sensor
installation.
Q: Is the wheel speed sensor bolted securely in place
at the front knuckle or the rear knuckle?
YES :
Go to Step 3.
NO :
). Then
STEP 3. Inspect the wheel speed sensor and/or
wheel speed rotor.
Refer to
Check items:
• Wheel speed sensor internal resistance: 1.24 −
1.64 k
Ω
• Insulation between the wheel speed sensor body
and the connector terminals
• Toothed wheel speed rotor check
Q: Is the wheel speed sensor or wheel speed rotor
damaged?
YES :
Replace it (Refer to
). Then go to
Step 15 .
NO :
Go to Step 4.
STEP 4. Check wheel speed sensor circuit.
Resistance measurement at the ABS-ECU
connector B-118.
(1) Disconnect the connector B-118 and measure at
the harness side.
(2) Measure the resistance between the ABS-ECU
connector terminals.
• If diagnosis code 11 or 21 is set: between ter-
minals 29 and 30
• If diagnosis code 12 or 22 is set: between ter-
minals 22 and 31
• If diagnosis code 13 or 23 is set: between ter-
minals 8 and 9
• If diagnosis code 14 or 24 is set: between ter-
minals 6 and 7
Standard Value: 1.24
− 1.64 kΩ
Q: Is the resistance within the standard value?
YES :
Go to Step 13.
NO <The resistance between terminals 22 and 31 is
not within the standard value.> :
Go to Step 5.
NO <The resistance between terminals 29 and 30 is
not within the standard value.> :
Go to Step 7.
NO <The resistance between terminals 6 and 7 is
not within the standard value.> :
Go to Step 9.
NO <The resistance between terminals 8 and 9 is
not within the standard value.> :
Go to Step 11.
AC311124
28
32
34
12
11
33
30
21
9
10
22
31
7
8
29
20 19
24
2
26
4
5
6
27
18 17
3
25
16 15
1
23
13
14
B-118 (B)
Connector: B-118
AB
Connector B-118
(harness side)
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-50
STEP 5. Check the following connectors.
•
ABS-ECU connector B-118
•
Intermediate connector C-31
•
Front wheel speed sensor (LH) connector A-03
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 6.
NO :
Repair it and then go to Step 15.
STEP 6. Check the following harness wires.
•
The wire between ABS-ECU connector B-118 (termi-
nal 22) and front wheel speed sensor (LH) con-
nector A-03 (terminal 2)
• The wire between ABS-ECU connector B-118
(terminal 31) and front wheel speed sensor (LH)
connector A-03 (terminal 1)
Q: Is any harness wire damaged?
YES :
Repair or replace it and then go to Step 15.
NO :
Go to Step 15.
AC311127AB
B-118 (B)
Connector: B-118
28
32
34
12
11
33
30
21
9
10
22
31
7
8
29
20 19
24
2
26
4
5
6
27
18 17
3
25
16 15
1
23
13
14
Harness side
AC311160AB
Connector: C-31
C-31
AC211899AC
Connector: A-03
A-03 (B)
1
2
Harness side
AC311127AB
B-118 (B)
Connector: B-118
28
32
34
12
11
33
30
21
9
10
22
31
7
8
29
20 19
24
2
26
4
5
6
27
18 17
3
25
16 15
1
23
13
14
Harness side
AC211899AC
Connector: A-03
A-03 (B)
1
2
Harness side
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