Mitsubishi Montero (2002-2004). Manual — part 1041

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-35

DIAGNOSIS

Required Special Tool:

• MB991502: Scan tool (MUT-II)

STEP 1. Using scan tool MB991502, check the ABS DTC.

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) Turn the ignition switch to the "ON" position.
(3) Check the ABS DTC.
Q: Is ABS DTC 52 set?

YES : Carry out the troubleshooting regarding DTC 52.

Refer to

P.35B-62

.

NO : Go to Step 2.

STEP 2. Using scan tool MB991502, check the HBB DTC.

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) Turn the ignition switch to the "ON" position.
(3) Check the HBB DTC.
Q: Is HBB DTC 16 set?

YES : Carry out the troubleshooting regarding HBB. Refer to

GROUP 35A, HBB Troubleshooting

P.35A-16

.

NO : Go to Step 3.

STEP 3. Check the battery.
Refer to GROUP 54A, Battery

− On-vehicle Service − Battery

Testing Procedure

P.54A-6

.

Q: Is the battery damaged?

YES : Charge or replace the battery and then go to Step 5 .
NO : Go to Step 4.

STEP 4. Check the charging system.
Refer to GROUP 16, Charging System

− Diagnosis

P.16-3

.

Q: Is the charging system damaged?

YES : Repair the Charging System and then go to Step 5.
NO : Replace the M-ASTC-ECU and then go to Step 5.

STEP 5. Recheck for diagnostic trouble code.
Q: Does DTC 16 reset?

YES : Start over at Step 1.
NO : The procedure is complete.

AC205731AB

MB991502

16-PIN

AC205731AB

MB991502

16-PIN

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-36

DTC 33 : Stoplight Switch System

AC204646AB

Stoplight Switch Circuit

AC204676 AB

DETICATED FUSE No.16

RELAY BOX

AC204677AB

CONNECTORS: D-28, D-29, D-123, D-125

D-28

D-29

D-125

D-123

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-37

.

CIRCUIT OPERATION
The ON signal when the brake pedal is pressed or
the OFF signal when the brake pedal is released is
input to the M-ASTC-ECU (terminal 19).

.

ABS DTC SET CONDITION
DTC 33 is set in the following cases:

• Stoplight switch is not operating properly and

remains in ON state for more than 15 minutes.

• Stoplight switch system harness is damaged and

no signal is input to M-ASTC-ECU.

.

TROUBLESHOOTING HINTS

• Malfunction of the stoplight switch

• Damaged wiring harness and connector

• Malfunction of the M-ASTC-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan tool (MUT-II)

STEP 1. Check the stoplight operation.
Q: Does the stoplight come on and go out correctly?

YES : Go to Step 5.
NO : Go to Step 2.

STEP 2. Check the stoplight switch installation condition.
Q: Is the stoplight switch installed properly?

YES : Go to Step 3.
NO : Repair it and then go to Step 8.

AC204384

D-116

AD

CONNECTOR: D-116

AC204548

E-111

AM

CONNECTOR: E-111

AC203901AE

CONNECTOR: E-119

E-119

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-38

STEP 3. Check the stoplight switch continuity.
(1) Remove the stoplight switch. (Refer to GROUP 35A, Brake

Pedal

P.35A-132

.)

(2) Connect an ohmmeter between to stoplight switch

connector terminals.

(3) There should be no continuity between the terminals when

the plunger is pushed in as shown. There should be
continuity when it is released.

Q: Is the stoplight switch continuity correct?

YES : Go to Step 4.
NO : Replace it and then go to Step 8.

TESTER
CONNECTION

PLUNGER

SPECIFIED
CONDITION

1

− 2

IN

Open circuit

OUT

Less than 2 ohms

ACX00671AB

NO CONTINUITY CONTINUITY

4 mm

(0.16 in)