Mitsubishi Montero (2004+). Manual - part 1061

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-87

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CIRCUIT OPERATION
The diagnostic output is made from the 
M-ASTC-ECU (terminal 21) to the diagnostic output 
terminal (terminal 7) of the data link connector.

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TECHNICAL DESCRIPTION (COMMENT)
When communication with the scan tool is not possi-
ble, the cause is probably an open circuit in the 
M-ASTC-ECU power circuit or an open circuit in the 
diagnostic output circuit.

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TROUBLESHOOTING HINTS

• Blown fuse

• Damaged wiring harness and connector

• Malfunction of the M-ASTC-ECU

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DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

AC204677AC

CONNECTORS: D-28, D-29, D-118

D-28

D-29

D-118(B)

AC204384

D-116

AF

CONNECTORS: D-14, D-116

D-14

AC204547AD

CONNECTORS: D-208, D-210, D-211, D-212

D-208

D-212

JUNCTION BLOCK
(FRONT VIEW)

D-211(B)

D-210

AC204548 AB

CONNECTOR: E-111

E-111

AC203901AD

CONNECTORS: E-119, E-120

E-119

E-120

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-88

STEP 1. Check the harness wires between M-ASTC-ECU 
connector E-119 terminal 21 and data link connector D-118 
terminal 7.
NOTE: After inspecting M-ASTC-ECU connector E-119, joint 
connector D-116, intermediate connector E-111 and joint con-
nector D-29, inspect the wire. If M-ASTC-ECU connector 
E-119, joint connector D-116, intermediate connector E-111 and 
joint connector D-29 are damaged, repair or replace them. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

If the connector has been repaired or replaced, go to Step 5.
Q: Are the harness wires between M-ASTC-ECU connector 

E-119 terminal 21 and data link connector D-118 terminal 
7 damaged?
YES : Repair them and then go to Step 5.
NO :  Go to Step 2.

AC203901

AC204627AC

CONNECTOR: E-119

E-119

HARNESS CONNECTOR: 
COMPONENT SIDE

E-119

AC204677

AC204701AD

CONNECTORS: D-29, D-118

D-29

D-29

DATA LINK CONNECTOR:

FRONT SIDE

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

D-118(B)

D-118

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-89

STEP 2. Check the power supply circuit at M-ASTC-ECU 
connectors E-119 and E-120.
(1) Disconnect connectors E-119 and E-120, and measure at 

the harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between M-ASTC-ECU connector 

E-120 terminal 63 and ground. It should be approximately 
12 volts (battery positive voltage).

Q: Is voltage approximately 12 volts (battery positive 

voltage)? 
YES : Go to Step 4.
NO :  Go to Step 3.

AC203901

AC204627AO

E-119

CONNECTORS: E-119, E-120

E-119

HARNESS CONNECTOR:
COMPONENT SIDE

E-120

HARNESS CONNECTOR:
COMPONENT SIDE

E-120

AC204708AB

HARNESS CONNECTOR: 
COMPONENT SIDE

E-120

HARNESS CONNECTOR:
COMPONENT SIDE

E-119

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-90

STEP 3. Check the harness wire between ignition switch 
(IG2) connector D-204 terminal 4 and M-ASTC-ECU 
connectors E-119 terminal 9 and E-120 terminal 63.
NOTE: After inspecting M-ASTC-ECU connectors E-119 and 
E-120, intermediate connector E-111, joint connector D-116, 
junction block connector D-208 and D-212, inspect the wire. If 
M-ASTC-ECU connectors E-119 and E-120, intermediate con-
nector E-111, joint connector D-116, junction block connector 
D-208 and D-212 are damaged, repair or replace them. Refer 
to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the 

connector has been repaired or replaced, go to Step 5.

AC204709

CONNECTOR: D-204

D-204

AB

AC203901

AC204627AO

E-119

CONNECTORS: E-119, E-120

E-119

HARNESS CONNECTOR:
COMPONENT SIDE

E-120

HARNESS CONNECTOR:
COMPONENT SIDE

E-120