Mitsubishi Montero Sport (2004+). Manual - part 782

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <RWD>

35B-9

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "ABS" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Choose "Actuator Test" from "ABS" screen.
8. Choose an appropriate item and select the "OK" button.

DIAGNOSTIC TROUBLE CODE CHART

M1352011300689

Follow the inspection chart that is appropriate for the diagnostic trouble code.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

DIAGNOSTIC 
TROUBLE 
CODE NO.

INSPECTION ITEM

DIAGNOSTIC CONTENT

REFERENCE PAGE

11

Front right wheel speed sensor Open circuit

P.35B-10

12

Front left wheel speed sensor

13

Rear right wheel speed sensor

14

Rear left wheel speed sensor

15

Wheel speed sensor

Abnormal output signal

P.35B-16

16

Power supply system

P.35B-22

21

Front right wheel speed sensor

P.35B-10

22

Front left wheel speed sensor

23

Rear right wheel speed sensor

24

Rear left wheel speed sensor

33

Stoplight switch system

P.35B-27

41

Front right solenoid valve inside hydraulic unit

P.35B-34

42

Front left solenoid valve inside hydraulic unit

43

Rear solenoid valve inside hydraulic unit

51

Hydraulic unit valve relay open or short circuit

P.35B-34

53

Malfunction of hydraulic unit

P.35B-34

63

ABS-ECU

Replace the ABS-ECU 

P.35B-69

.

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <RWD>

35B-10

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC 11, 12, 13, 14: Wheel Speed Sensor (Open Circuit)
DTC 21, 22, 23, 24: Wheel Speed Sensor

AC005089

Wheel Speed Sensor Circuit

AB

AC004817

CONNECTOR: A-18

AH

A-18 (B)

AC004843

CONNECTOR: A-31

AD

A-31 (B)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <RWD>

35B-11

.

CIRCUIT OPERATION

• A toothed ABS 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 ABS 
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.

• The ABS hydraulic unit modulates the amount of 

braking force individually applied to each wheel 
cylinder.

.

ABS DTC SET CONDITIONS
DTCs 11, 12, 13, 14 are set when signal is not input 
due to breakage of the (+) or (

−) wire of one or more 

of the four wheel-speed sensors. 
DTCs 21, 22, 23, 24 are set in the following 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 sen-

sor or warped ABS rotor.

.

TROUBLESHOOTING HINTS
The most likely causes for these DTCs to set are:
DTC 11, 12, 13, 14

• Malfunction of the wheel speed sensor

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

DTC 21, 22, 23, 24

• Malfunction of the wheel speed sensor

• Damaged wiring harness and connector

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

• Malfunction of the ABS rotor

• Malfunction of the wheel bearing

• Excessive clearance between the sensor and 

ABS rotor

AC004837

CONNECTOR: A-85

AH

A-85 (B)

AC004261

CONNECTOR: C-17

AI

AC004844

CONNECTORS: E-29, E-39

AC

E-39 (B)

E-29 (B)

AC004845

CONNECTOR: E-45

AC

E-45 (B)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS) <RWD>

35B-12

.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

STEP 1. Check the wheel speed sensor installation.
Q: Is the wheel speed sensor bolted securely in place at 

the front knuckle or the rear axle housing?
YES : Go to Step 2.
NO :  Install it properly. Refer to 

P.35B-71

. Then go to Step 

9 . 

STEP 2. Measure the wheel speed sensor circuit 
resistance at ABS-ECU connector A-85.

(1) Disconnect connector A-85 and measure at the harness 

side.

(2) Measure the resistance between ABS-ECU connector 

terminals 1 and 2, 3 and 4, 18 and 19, 20 and 21.

Standard Value: 1.3 

− 1.5 kΩ

Q: Is the resistance between terminals 1 and 2, 3 and 4, 18 

and 19, 20 and 21 within 1.3 

− 1.5 kΩ?

YES : Go to Step 6.
NO :  Go to Step 3, or Step 4, or Step 5           

AC203837

18

12 11

20 19

10

3 2 1

13

14

22

23

17 16

25 24

15

8 7 6 5 4

21

9

26

A-85 
HARNESS CONNECTOR:
COMPONENT SIDE

AB