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 

P.00-5

. 

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 : 

Install it properly (Refer to 

P.35B-146

). Then 

go to Step 15          .

STEP 3. Inspect the wheel speed sensor and/or 
wheel speed rotor.
Refer to 

P.35B-147

.

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 

P.35B-146

). 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