Mitsubishi Montero Sport (2004+). Manual — part 803
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>
35C-19
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
.
STEP 1. Check the wheel speed sensor installation.
Q: Is the wheel speed sensor bolted securely in place at
the front knuckle or the rear axle housing?
YES : Go to Step 2.
NO : Install it properly. Refer to
. Then go to Step
STEP 2. Check the harness wires between ABS-ECU
connector A-85 (terminal No.20 and 21) and wheel speed
sensor <front: LH> connector A-18 (terminal No.1 and 2).
Q: Are any harness wires between ABS-ECU connector
A-85 (terminal No.20 and 21) and wheel speed sensor
<front: LH> connector A-18 (terminal No.1 and 2)
damaged?
YES : Repair them and go to Step 8.
NO : Go to Step 3.
AC201945
CONNECTOR : A-18
A-18(B)
AB
1
2
A-18 HARNESS
CONNECTOR:
COMPONENT SIDE
2 1
AC201944
CONNECTOR : A-85
A-85(B)
A-85 HARNESS
CONNECTOR:
COMPONENT SIDE
AD
18
12 11
20 19
10
3 2 1
13
14
22
23
17 16
25 24
15
8 7 6 5 4
21
9
26
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>
35C-20
STEP 3. Check the harness wires between ABS-ECU
connector A-85 (terminal No. 18 and 19) and wheel speed
sensor <front: RH> connector A-31 (terminal No. 1 and 2).
Q: Are any harness wires between ABS-ECU connector
A-85 (terminal No.18 and 19) and wheel speed sensor
<front: RH> connector A-31 (terminal No.1 and 2)
damaged?
YES : Repair them and then go to Step 8.
NO : Go to Step 4.
AC201944
CONNECTOR : A-31
A-31(B)
A-31 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
1
2
2 1
AC201944
CONNECTOR : A-85
A-85(B)
A-85 HARNESS
CONNECTOR:
COMPONENT SIDE
AD
18
12 11
20 19
10
3 2 1
13
14
22
23
17 16
25 24
15
8 7 6 5 4
21
9
26
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>
35C-21
STEP 4. Check the harness wires between ABS-ECU
connector A-85 (terminal No.1, 2, 3 and 4) and wheel speed
sensor connector E-29 <rear: LH> (terminal No. 1 and 2) or
E-39 <rear RH> (terminal No. 1 and 2).
AC201944
CONNECTOR : A-85
A-85(B)
A-85 HARNESS
CONNECTOR:
COMPONENT SIDE
AD
18
12 11
20 19
10
3 2 1
13
14
22
23
17 16
25 24
15
8 7 6 5 4
21
9
26
AC201954
CONNECTOR : E-29
E-29(B)
E-29 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
1
2
AC201953
CONNECTOR : E-39
E-39(B)
E-39 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
1
2
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS) <4WD>
35C-22
NOTE: After inspecting intermediate connectors C-17 and
E-45, inspect the wires. If intermediate connector C-17 or E-45
is damaged, repair or replace it. Refer to GROUP 00E, Har-
ness Connector Inspection
. If the connector has been
repaired or replaced, go to Step 8.
Q: Are any harness wires between ABS-ECU connector
A-85 (terminal No.1, 2, 3 and 4) and wheel speed sensor
connector E-29 <rear: LH> (terminal No.1 and 2) or E-39
<rear RH> (terminal No.1 and 2) damaged?
YES : Repair them and then go to Step 8.
NO : Go to Step 5.
STEP 5. Measure the wheel speed sensor output voltage.
Refer to
.
Output Voltage:
• When measured with a voltmeter: 70 mV or more
• When measured with oscilloscope (maximum voltage): 200
mV or more
Q: Is the measured voltage within the specified range?
YES : Replace the hydraulic unit (integrated with ABS-ECU)
and then go to Step 8.
NO : Go to Step 6.
STEP 6. Check the wheel speed sensor or ABS rotor.
Refer to
. If there is damage in any of the check items,
replace the wheel speed sensor.
Check items:
• Wheel speed sensor internal resistance
Standard value: 1.3
− 1.5 kΩ
• Wheel speed sensor insulation resistance
Standard value: 100 k
Ω
• Toothed ABS rotor check
Q: Is the wheel speed sensor or ABS rotor damaged?
YES : Replace it and then go to Step 8.
NO : Go to Step 7.
AC201950
CONNECTOR : C-17
C-17
AB
17
7
15
5
16
6
12 13
10
3
11
14
4
8
1
9
2
AC201953
CONNECTOR : E-45
E-45(B)
E-45(B)
AC
1
10
2
11
3
12
4
1314 15
5
16
6
17
7
18
8
19
9
20
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