Mitsubishi Montero (2002-2004). Manual - part 1037

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-19

NOTE: After inspecting M-ASTC-ECU connector E-120, inter-
mediate connector D-111, E-110 and ABS sensor <rear: RH>
connector G-14, inspect the wire. If M-ASTC-ECU connector E-
120, intermediate connector E-110, D-111 and ABS sensor
<rear: RH> connector G-14 are damaged, repair or replace
them. Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

. Then go to Step 9.

Q: Is the harness wire between M-ASTC-ECU connector E-

120 terminal 60 and ABS sensor <rear: RH> connector
G-14 terminal 2 or M-ASTC-ECU connector E-120
terminal 61 and ABS sensor <rear: RH> connector G-14
terminal 1 damaged?
YES : Repair it and then go to Step 9.
NO : Go to Step 9.

STEP 9. Recheck for diagnostic trouble code.
Q: Do the DTCs 11, 12, 13 or 14 reset?

YES : Go to Step 1.
NO : The procedure is complete.

AC204384

CONNECTOR: D-111

D-111

3 4

5 6

4243

1920

1617

AC204385

CONNECTOR: E-110

E-110

1314

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-20

DTC 21, 22, 23, 24: ABS Sensor

AC204644AB

ABS Sensor Circuit

AC000709AF

CONNECTOR: A-03

AC000710

CONNECTOR: A-24

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-21

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 21, 22, 23, 24 are output in the following
cases:

• Open circuit is not found but no input is received

by one or more of the four ABS 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:

• Malfunction of the ABS sensor

• Damaged wiring harness and connector

• Malfunction of the M-ASTC-ECU

• Malfunction of the ABS rotor

• Malfunction of the wheel bearing

• Excessive clearance between the sensor and

ABS rotor

AC000711

CONNECTOR: A-37

ACX02283

CONNECTOR: D-111

ACX01852

E-110

CONNECTORS: E-105, E-110

E-105

ACX02289AK

CONNECTOR: F-11

ACX02290

CONNECTORS: G-14, G-21

G-14

G-21

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-22

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan tool (MUT-II)

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