Mitsubishi Montero (2004+). Manual — part 1062
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-91
Q: Are the harness wires between ignition switch (IG2)
connector D-204 terminal 4 and M-ASTC-ECU
connectors E-119 terminal 9 and E-120 terminal 63
damaged?
YES : Repair them and then go to Step 5.
NO : Go to Step 5.
AC204385
AC204673
CONNECTOR: E-111
AB
E-111
9
21
33
35
24
12
3 4
7
8
5 6
39
28
41
30
18
4243
31
1920
32
40
29
1617
38
27
15
37
36
26
14
13
25
2
1
34
23
11
10
22
E-111
AC204384
D-116
AE
CONNECTOR: D-116
AC204624 AF
CONNECTORS: D-208, D-212
D-208
JUNCTION BLOCK
(FRONT VIEW)
JUNCTION BLOCK CONNECTOR
D-212
D-212
D-208
6
2
5
1
7 8
11
4
9 10
3
JUNCTION BLOCK CONNECTOR
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-92
STEP 4. Check the wiring harnesses between
M-ASTC-ECU connectors E-119 terminals 4, 22 and ground
as well as between M-ASTC-ECU connectors E-120
terminals 56, 64 and ground.
NOTE: After inspecting M-ASTC-ECU connectors E-119 and
E-120, inspect the wire. If M-ASTC-ECU connectors E-119 and
E-120 are damaged, repair or replace them. Refer to GROUP
00E, Harness Connector Inspection
. If the connector
has been repaired or replaced, go to Step 5.
Q: Are the wiring harnesses between M-ASTC-ECU
connectors E-119 terminals 4, 22 and ground as well as
between M-ASTC-ECU connectors E-120 terminals 56,
64 and ground damaged?
YES : Repair them and then go to Step 5.
NO : Replace the M-ASTC-ECU and go to Step 5.
AC203901
AC204627AO
E-119
CONNECTORS: E-119, E-120
E-119
HARNESS CONNECTOR:
COMPONENT SIDE
E-120
HARNESS CONNECTOR:
COMPONENT SIDE
E-120
AC204710 AB
GROUND POINT
ACX01508
GROUND POINT
AF
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-93
STEP 5. Retest the system
Q: Does the scan tool communicate with the ABS system?
YES : The procedure is complete.
NO : Return to Step 1.
INSPECTION PROCEDURE 2: When the Ignition Switch is Turned the "ON" Position (Engine Stopped
or after Start-up), the ABS Warning Light does not Illuminate.
AC204874 AB
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)
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-94
.
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 3 seconds while running self-check. This
light can be illuminated for 3 seconds upon
start-up or ignition switch to the "ON" position,
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)
When the M-ASTC-ECU warning light circuit is in
good condition, the ABS warning light illuminates for
3 seconds when the ignition switch is turned to the
"ON" position. For instance, if the ABS warning light
circuit of M-ASTC-ECU is out of order, the light illumi-
nates once when the valve relay is switched to the
"OFF" position during initial check. If the ABS warn-
ing light does not illuminate when the ignition switch
is turned to the "ON" position, the following items are
suspected to be the cause: open circuit on the light
power circuit, burned out light bulb, open circuit
between the ABS warning light and the
M-ASTC-ECU, and open circuit between the ABS
warning light and the valve relay.
.
TROUBLESHOOTING HINTS
• Damaged wiring harness or connector
• Burnt out ABS warning light bulb
• Malfunction of the M-ASTC-ECU
.
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. Check the illumination of brake warning light.
Turn the ignition switch to the "ON" position. The brake warning
light should turn on.
Q: Does the brake warning light turn on?
YES : Go to Step 2.
NO : Go to Step 7.
AC204546 AB
CONNECTOR: D-03
D-03 (GR)
AC203901AF
CONNECTOR: E-120
E-120
AC204385
CONNECTORS: E-108, E-110
AE
E-110
E-108(B)
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