Mitsubishi Montero (2004+). Manual - part 1065

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-103

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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 illuminates when 
the valve relay is switched to OFF.

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TECHNICAL DESCRIPTION (COMMENT)
The short circuit of ABS warning light circuit is con-
sidered to be the cause. The failure of valve relay 
OFF can be suspected as the cause, but in this case 
DTC 52 would be output.

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TROUBLESHOOTING HINTS

• Damaged wiring harness

• Malfunction of M-ASTC-ECU

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DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

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)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-104

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

(2) Remove the valve relay.
(3) Turn the ignition switch to the "ON" position. The ABS 

warning light goes out.

Q: Does the ABS warning light go out?

YES : Replace the M-ASTC-ECU and then go to Step 4.
NO :  Go to Step 2.

AC203901

AC204627AG

CONNECTOR: E-120

E-120

HARNESS CONNECTOR: 
COMPONENT SIDE

E-120

AC204674

AC

VALVE RELAY

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-105

STEP2. Check the harness wire between combination 
meter connector D-03 terminal 56 and M-ASTC-ECU 
connector E-120 terminal 62.
Q: Is the harness wire between combination meter 

connector D-03 terminal 62 and M-ASTC-ECU connector 
E-120 terminal 62 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

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-106

STEP 3. Check the harness wires between combination 
meter connector D-03 terminal 56 and valve relay 
connector B-21X terminal 2.
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 :  Replace the combination meter (printed circuit board) 

and go to Step 4.

STEP 4. Retest the system.
Q: Does the ABS warning light turn off 3 seconds after 

start-up?
YES : The procedure is complete.
NO :  Return to Step 1.

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