Mitsubishi Montero (2002-2004). Manual - part 1034

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-7

NOTE: If the trouble marked by * has occurred, the M-ASTC-ECU sounds the buzzer continuously to inform 
the trouble of the driver and protects the pump motor by activating the pump motor intermittently.

67

Steering wheel sensor system

Trouble in communication 
line

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-38

.

68

Steering wheel sensor system

Abnormal output signal

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-30

.

71

Yaw rate sensor system

Trouble in self-diagnosis

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-24

.

72

Yaw rate sensor system

Incorrectly set reference 
value

73

Yaw rate sensor system

Abnormal output signal

74

Abnormal communication of the G and yaw rate sensor

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-46

.

75

Center differential lock switch

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-52

.

76

G-sensor system

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-24

.

77

Yaw rate sensor system

78

Incorrect PCM fitted

Refer to GROUP 35C, 
ABS Trouble Code 
Diagnosis 

P.35C-15

.

81

G sensor not initialized

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-56

.

82

Yaw rate sensor not initialized

83

Steering wheel sensor not initialized

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-30

.

84

Transfer switch not initialized

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-58

.

85

Master cylinder pressure sensor not initialized

Refer to GROUP 35C, 
Active skid control system 
Trouble Code Diagnosis 

P.35C-58

.

DIAGNOSTIC 
TROUBLE 
CODE NO.

INSPECTION ITEM

DIAGNOSTIC CONTENT

REFERENCE PAGE

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-8

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC 11, 12, 13, 14: ABS Sensor (Open Circuit or Short Circuit)

AC204644AB

ABS Sensor Circuit

AC204389

CONNECTOR: A-03

A-03(B)

AB

AC204388

CONNECTOR: A-24

AB

A-24(B)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-9

.

CIRCUIT OPERATION

• A toothed ABS rotor generates a voltage pulse as 

it moves across the pickup field of each ABS sen-
sor.

• The amount of voltage generated at each wheel 

is determined by the clearance between the ABS 
rotor teeth and the ABS sensor, and by the speed 
of rotation.

• The ABS sensors transmit the frequency of the 

voltage pulses and the amount of voltage gener-
ated by each pulse to the Mitsubishi active skid 
and traction control system-electronic control unit 
(M-ASTC-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 output when signal is not 
input due to breakage of the (+) or (

−) wire of one or 

more of the four ABS sensors. 

.

TROUBLESHOOTING HINTS
The most likely causes for these DTCs to set are:

• Malfunction of the ABS sensor

• Damaged wiring harness or connector

• Malfunction of the M-ASTC-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan tool (MUT-II)

AC204387

CONNECTOR: A-37

A-37(B)

AB

AC204384

CONNECTOR: D-111

D-111

AB

AC204385

CONNECTORS: E-110, E-119, E-120

E-119

AB

E-120

E-110

AC204386

CONNECTOR: F-11

F-11(B)

AB

AC204390

CONNECTORS: G-14, G-21

G-21(B)

AB

G-14(B)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-10

STEP 1. Using scan tool MB991502, check data list item 11, 
12, 13, 14: ABS sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991502 to data reading mode for item 11, 

12, 13, 14, ABS sensor.

• With the engine running, reading on the speedometer 

nearly matches the indication on scan tool MB991502.

Q: Is the ABS 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.00-6

. 

NO :  Go to Step 2.

STEP 2. Check the ABS sensor installation.
Q: Is the ABS 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-124

. Then go to Step 

9.

ACX01539AE

MB991502

16-PIN

ACX01221

ABS SENSOR <FRONT>

AD

ACX01227AD

ABS SENSOR <REAR>