Mitsubishi Montero (2002-2004). Manual — part 1059
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-107
.
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 illumi-
nates when the valve relay is switched to OFF.
• The M-ASTC-ECU illuminates the ABS warning
light for three seconds while running self-check.
This light can be illuminated for three seconds
upon start-up or ignition switch to the "ON" posi-
tion, engine stopped. The M-ASTC-ECU drives
the valve relay in the order of OFF to ON to OFF
to ON during initial check to check the valve relay.
.
TECHNICAL DESCRIPTION (COMMENT)
The M-ASTC-ECU causes the ABS warning light to
illuminate during the initial check (three seconds).
During the initial check, the valve relay turns from off
to on, off and back to on again, and if there is a open
circuit in the harness between the M-ASTC-ECU and
the ABS warning light, the light will illuminate only
when the valve relay is OFF because of a valve relay
test, etc.
.
TROUBLESHOOTING HINTS
• Damaged wiring harness or connector
• Malfunction of the M-ASTC-ECU
.
AC204385
CONNECTORS: E-108, E-110
AE
E-110
E-108(B)
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-108
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. Check the ABS warning light circuit at M-ASTC-
ECU connector E-120.
(1) Disconnect M-ASTC-ECU connector E-120 and measure at
the harness side.
(2) Remove the valve relay.
(3) Ground the terminal 62.
(4) Turn the ignition switch to the "ON" position. The ABS
warning light should turn on.
Q: Is the ABS warning light turn on?
YES : Replace the M-ASTC-ECU. Then go to Step 3.
NO : Go to Step 2.
AC204674
AB
B-21X (VALVE RELAY)
CONNECTOR: B-21X
AC203901
AC204627
CONNECTOR: E-120
AS
E-120
HARNESS CONNECTOR:
COMPONENT SIDE
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-109
STEP 2. Check the harness wires between combination
meter connector D-03 terminal 56 and M-ASTC-ECU
connector E-120 terminal 62.
AC204690 AC
CONNECTOR: D-03
D-03 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
D-03
AC203901
AC204627AG
CONNECTOR: E-120
E-120
HARNESS CONNECTOR:
COMPONENT SIDE
E-120
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-110
NOTE: After inspecting M-ASTC-ECU connector E-106,
inspect the wire. If M-ASTC-ECU connector E-106 is damaged,
repair or replace it. Refer to GROUP 00E, Harness Connector
Inspection
.Then go to Step 3.
Q: Is the harness wire between combination meter
connector D-03 terminal 56 and M-ASTC-ECU connector
E-106 terminal 62 damaged?
YES : Repair it and then go to Step 3.
NO : This malfunction is intermittent. Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
− How to Cope with Intermittent Malfunction
.
STEP 3. Retest the system.
Q: Does the ABS warning light illuminate for 3 seconds
when the ignition switch is turned to the "ON" position
with engine stopped or upon start-up?
YES : The procedure is complete.
NO : Return to Step 1.
INSPECTION PROCEDURE 6: Faulty ABS Operation
.
TECHNICAL DESCRIPTION (COMMENT)
The cause depends on driving and road surface con-
ditions, so diagnosis may be difficult. However, if no
diagnostic trouble code is displayed, carry out the fol-
lowing inspection.
.
TROUBLESHOOTING HINTS
• Malfunction of the hydraulic brake booster (HBB)
.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan tool (MUT-II)
STEP 1. Check the HBB hydraulic unit.
Check the operation of HBB hydraulic unit. Refer to
.
Q: Does HBB hydraulic unit operate normally?
YES : Intermittent malfunction of the vehicle speed sensor is
assumed to be the cause. Refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points
−
How to Cope With Intermittent Malfunction
.
Then go to Step 2.
NO : Replace the HBB master cylinder and hydraulic unit
assembly and go to Step 2.
STEP 2. Retest the system.
Q: Do the brakes operate normally?
YES : The procedure is complete.
NO : Return to Step 1.
AC204385
CONNECTOR: E-110
AD
E-110
6
1
7
2
9
8
10
3
5
12
11
4
1314
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