Mitsubishi Montero (2002-2004). Manual — part 1058
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-103
.
CIRCUIT OPERATION
The ABS warning light power is supplied from the
ignition switch. The M-ASTC-ECU grounds the circuit
to illuminate the light. The light also illuminates when
the valve relay is switched to OFF.
.
TECHNICAL DESCRIPTION (COMMENT)
The M-ASTC-ECU uses the power supply which is
turned off when the ignition switch is turned to
"START" position. The ABS warning light uses the
power supply which is not turned off when the igni-
tion switch is turned to the "START" position. Accord-
ingly, when the ignition switch is turned to the
"START" position, the power supply to the M-ASTC-
ECU is turned off and the valve relay is also turned
off. So, when the ABS warning light does not illumi-
nate at this time, the light illumination circuit in the
valve relay system is defective.
.
TROUBLESHOOTING HINTS (The most likely
causes for this condition:)
• Damaged wiring harness
• Malfunction of valve relay
• Malfunction of M-ASTC-ECU
.
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. Check the valve relay.
Q: Is the relay damaged?
YES : Replace the part. Then go to Step 4.
NO : Go to Step 2.
AC204385
CONNECTORS: E-108, E-110
AE
E-110
E-108(B)
BATTERY VOLTAGE
TESTER
CONNECTION
SPECIFIED
CONDITION
Not applied
2
− 4
Less than 2
ohms
• Connect terminal 1 to the
positive battery terminal
• Connect terminal 3 to the
negative battery terminal
Open circuit
AC204674
AC204762
AB
B-21X (VALVE RELAY)
CONNECTOR: B-21X
2
1
3
5
4
1 4
5
2
3
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-104
STEP 2. Check the harness wire between combination
meter connector D-03 terminal 56 and valve relay
connector B-21X terminal 2.
NOTE: After inspecting valve relay connector B-21X and inter-
mediate connector E-110, inspect the wire. If valve relay con-
nector B-21X and intermediate connector E-110 are damaged,
repair or replace them. Refer to GROUP 00E, Harness Con-
nector Inspection
.Then go to Step 4.
Q: Is the harness wire between combination meter
connector D-03 terminal 56 and valve relay connector B-
21X terminal 2 damaged?
YES : Repair it and then go to Step 4.
NO : Go to Step 3.
AC204690 AC
CONNECTOR: D-03
D-03 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
D-03
AC204706
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
5
B-21X
CONNECTOR: B-21X
AB
RELAY BOX CONNECTOR
AC204385
CONNECTOR: E-110
AD
E-110
6
1
7
2
9
8
10
3
5
12
11
4
1314
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-105
STEP 3. Check the harness wire between valve relay
connector B-21X terminal 4 and ground.
NOTE: After inspecting valve relay connector B-21X, inspect
the wire. If valve relay connector B-21X is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion
.Then go to Step 4.
Q: Is the harness wire between valve relay connector B-
21X terminal 4 and ground damaged?
YES : Repair it and then go to Step 4.
NO : This malfunction is intermittent. Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
− How to Cope With Intermittent Malfunction
.
STEP 4. Retest the system.
Q: Does the ABS warning light illuminate when the ignition
switch is turned to the "START" position?
YES : The procedure is complete.
NO : Return to Step 1.
AC204706
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
5
B-21X
CONNECTOR: B-21X
AB
RELAY BOX CONNECTOR
AC203935
AC
GROUND POINT
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-106
INSPECTION PROCEDURE 5: The ABS Warning Light Flashes Twice after the Ignition Switch is
Turned to the "On" Position. The Light Illuminates When the Ignition Switch is Turned to the "Start"
Position, and When the Ignition Switch is Returned to the "On" Position, it Flashes Once.
AC204875AB
ABS Warning Light Circuit
AC204674
AB
B-21X (VALVE RELAY)
CONNECTOR: B-21X
AC204547AC
CONNECTORS: D-208, D-210
D-208
D-210
JUNCTION BLOCK
(FRONT VIEW)
AC204546 AB
CONNECTOR: D-03
D-03 (GR)
AC203901AF
CONNECTOR: E-120
E-120
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