Mitsubishi Montero (2004+). Manual — part 1120
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-191
.
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 indica-
tor 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
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-192
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 4.
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-193
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
. 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. 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
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-194
STEP 3. Check the harness wires between combination
meter connector D-03 terminal 62 and M-ASTC-ECU
connector E-121 terminal 74.
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
. Then go to Step 4.
Q: Is the harness wire between combination meter
connector D-03 terminal 62 and M-ASTC-ECU connector
E-121 terminal 74 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
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