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
68
Steering wheel sensor system
Abnormal output signal
Refer to GROUP 35C,
Active skid control system
Trouble Code Diagnosis
71
Yaw rate sensor system
Trouble in self-diagnosis
Refer to GROUP 35C,
Active skid control system
Trouble Code Diagnosis
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
75
Center differential lock switch
Refer to GROUP 35C,
Active skid control system
Trouble Code Diagnosis
76
G-sensor system
Refer to GROUP 35C,
Active skid control system
Trouble Code Diagnosis
77
Yaw rate sensor system
78
Incorrect PCM fitted
Refer to GROUP 35C,
ABS Trouble Code
Diagnosis
.
81
G sensor not initialized
Refer to GROUP 35C,
Active skid control system
Trouble Code Diagnosis
82
Yaw rate sensor not initialized
83
Steering wheel sensor not initialized
Refer to GROUP 35C,
Active skid control system
Trouble Code Diagnosis
84
Transfer switch not initialized
Refer to GROUP 35C,
Active skid control system
Trouble Code Diagnosis
85
Master cylinder pressure sensor not initialized
Refer to GROUP 35C,
Active skid control system
Trouble Code Diagnosis
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
.
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
. Then go to Step
ACX01539AE
MB991502
16-PIN
ACX01221
ABS SENSOR <FRONT>
AD
ACX01227AD
ABS SENSOR <REAR>
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