Mitsubishi Montero (2004+). Manual — part 1067

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-111

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

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-112

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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

.

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

AC204385

CONNECTORS: E-108, E-110

AE

E-110

E-108(B)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

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STEP 1. Check the ABS warning light circuit at
M-ASTC-ECU connector E-120.
(1) Remove the valve relay.

(2) Disconnect M-ASTC-ECU connector E-120 and measure at

the harness side.

(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

AC

VALVE RELAY

AC203901

AC204627

CONNECTOR: E-120

AS

E-120

HARNESS CONNECTOR:
COMPONENT SIDE

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

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STEP 2. Check the harness wires between combination
meter connector D-03 terminal 56 and M-ASTC-ECU
connector E-120 terminal 62.
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

P.00E-2

.Then go to Step 3.

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