Mitsubishi Montero (2004+). Manual - part 1121

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-195

STEP 4. Retest the system.
Q: When the ignition switch is turned "ON" (engine 

stopped or after startup), does the Active skid control 
system operation indicator light/Active traction control 
system operation indicator light illuminate?
YES : The procedure is complete.
NO :  Return to Step 1.

INSPECTION PROCEDURE 2: When the ignition switch is tured "ON" (Engine stopped or after 
startup), the Active skid control system OFF indicator light does not illuminate.

Active Skid Control System OFF Indicator Light Circuit

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-196

.

CIRCUIT OPERATION
The Active skid control system OFF indicator light is 
connected from the ignition switch (IG1) through 
multi-purpose fuse No.6 and the combination 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 OFF 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

.

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

AC204546 AB

CONNECTOR: D-03

D-03 (GR)

AC204547AC

CONNECTORS: D-208, D-210

D-208

D-210

JUNCTION BLOCK
(FRONT VIEW)

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-197

STEP 1. Check the Active skid control system OFF 
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 82 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 4.
NO :  Go to Step 2.

AC203901

AC204627AR

CONNECTOR: E-121

E-121

E-121

HARNESS CONNECTOR: 
COMPONENT SIDE

AC205144AC

CONNECTOR: E-121

HARNESS CONNECTOR: 
COMPONENT SIDE

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-198

STEP 2. Check the harness wires between ignition switch 
(IG1) connector D-204 terminal 2 and combination meter 
connector D-03 terminal 62.
NOTE: After inspecting combination meter connector D-03, 
ignition switch (IG1) connector D-204, junction block connector 
D-208 and D-210, inspect the wire. If combination meter con-
nector D-03, ignition switch (IG1) connector D-204, junction 
block connector D-208 and D-210 are damaged, repair or 
replace them. Refer to GROUP 00E, Harness Connector 
Inspection 

P.00E-2

. Then go to Step 4.

Q: Is the harness wire between ignition switch (IG1) 

connector D-204 terminal 2 and combination meter 
connector D-03 terminal 62 damaged?
YES : Repair the wiring harness wires between ignition 

switch (IG1) connector D-204 terminal 2 and 
combination meter connector D-03 terminal 62, and 
then go to Step 4.

NO :  Go to Step 3.

AC204687AD

CONNECTOR: D-03

D-03 (GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

AC204709

CONNECTOR: D-204

D-204

AD

2
5

6

3

4

1

HARNESS CONNECTOR:

COMPONENT SIDE

AC204624 AG

CONNECTORS: D-208, D-210

D-208

JUNCTION BLOCK
(FRONT VIEW)

JUNCTION BLOCK CONNECTOR

D-208

D-210

D-210

1 2 3

4

12

9

8

7

6

10

5

13

11

JUNCTION BLOCK CONNECTOR