Mitsubishi Montero (2002-2004). Manual - part 1141

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-181

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: When the ignition switch is turned "ON" (Engine stopped or after 
startup), the Active skid control system operation indicator light/Active traction control system 
operation indicator light does not illuminate.

Active Skid Control System Operation Indicator Light/
Active Traction Control System Operation Indicator Light Circuit

AC204546 AB

CONNECTOR: D-03

D-03 (GR)

AC204547AC

CONNECTORS: D-208, D-210

D-208

D-210

JUNCTION BLOCK
(FRONT VIEW)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-182

.

CIRCUIT OPERATION
The Active skid control system operation indicator 
light/Active traction control system operation indica-
tor light is connected from the ignition switch (IG1) 
through multi-purpose fuse No.6 and the combina-
tion meter to the M-ASTC-ECU. The M-ASTC-ECU 
turns on and off the indicator light.

.

TECHNICAL DESCRIPTION (COMMENT)
This symptom is caused by a shorted or opened 
Active skid control system operation indicator light/
Active traction control system operation indicator 
light circuit.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this condition:)

• Damaged wiring harness

• Burned-out bulb

• Melted fuse

• Malfunction of M-ASTC-ECU

.

AC203901AG

CONNECTOR: E-121

E-121

AC204548

E-122

AO

CONNECTOR: E-122

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-183

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check the Active skid control system operation 
indicator light/Active traction control system operation 
indicator light circuit at M-ASTC-ECU connector E-121.
(1) Disconnect M-ASTC-ECU connector E-121 and measure at 

the harness side.

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

(3) Measure the voltage between terminal 74 and ground. It 

should be approximately 12 volts (battery positive voltage).

Q: Is the voltage approximately 12 volts (battery positive 

voltage)?
YES : Replace the M-ASTC-ECU and then go to Step 6.
NO :  Go to Step 2.

AC203901

AC204627AR

CONNECTOR: E-121

E-121

E-121

HARNESS CONNECTOR: 
COMPONENT SIDE

AC205144AB

CONNECTOR: E-121

HARNESS CONNECTOR: 
COMPONENT SIDE

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-184

STEP2. Check combination meter connector D-03.
(1) Disconnect combination meter connector D-03 and 

measure at the combination meter side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 53 and ground. It 

should be approximately 12 volts (battery positive voltage).

Q: Is the voltage approximately 12 volts (battery positive 

voltage)?
YES : Go to Step 5.
NO :  Go to Step 3.

STEP 3. Check the harness wires between combination 
meter connector D-03 terminal 53 and terminal 62.
Q: Is the harness wire between combination meter 

connector D-03 terminal 53 and terminal 62 damaged?
YES : Go to Step 4.
NO :  Replace the combination meter (printed circuit board) 

and go to Step 6.

AC205146

CONNECTOR: D-03

COMBINATION METER
SIDE CONNECTOR

AB

AC205148

CONNECTOR: D-03

COMBINATION
METER SIDE
CONNECTOR

AB