Mitsubishi Montero (2004+). Manual - part 1122

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-199

STEP 3. Check the harness wires between combination 
meter connector D-03 terminal 51 and M-ASTC-ECU 
connector E-121 terminal 82.
NOTE: After inspecting combination meter connector combina-
tion meter connector D-03, intermediate connector E-122 and 
M-ASTC-ECU connector E-121, inspect the wire. If combina-
tion meter connector D-03, intermediate connector E-122 and 
M-ASTC-ECU connector E-121 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 combination meter 

connector D-03 terminal 51 and M-ASTC-ECU connector 
E-121 terminal 82 damaged?
YES : Repair it and then go to Step 4.
NO :  Replace the combination meter (printed circuit board), 

and then go to Step 4.

AC204687AD

CONNECTOR: D-03

D-03 (GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

AC203901

AC204627AR

CONNECTOR: E-121

E-121

E-121

HARNESS CONNECTOR: 
COMPONENT SIDE

AC204548

E-122(L)

AP

CONNECTOR: E-122

2

1

3

13

12

14

21

10

5

4

6

16

15

17

7 8 9

19

18

20

11

22

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-200

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

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

INSPECTION PROCEDURE 3: The Active skid control system operation indicator light/Active traction 
control system operation indicator light remains illuminated after the engine is started.

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

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-201

.

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 Active skid 
control system operation indicator light/Active trac-
tion control system operation indicator light circuit.

.

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

• Damaged wiring harness

• 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-202

STEP 1. Check the Active skid control system operation 
indicator light/Active traction control system operation 
indicator light drive circuit at M-ASTC-ECU connector 
E-121 terminal.

(1) Disconnect M-ASTC-ECU connector E-121.
(2) Turn the ignition switch to the "ON" position.
Q: Does the indicator light turn off?

YES : Replace the M-ASTC-ECU and then go to Step 3.
NO :  Go to Step 2.

AC203901

AC204627AR

CONNECTOR: E-121

E-121

E-121

HARNESS CONNECTOR: 
COMPONENT SIDE