Mitsubishi Montero (2002-2004). Manual — part 1140
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-177
STEP 1. Check G and yaw rate sensor connector E-126 and
intermediate connector E-123.
CAUTION
If there is a problem in the connector(s) (including terminals) or
wire(s) of the instrument panel wiring harness assembly (the wir-
ing harness connected to the steering wheel sensor, the data
link connector and the resistor) and the transmission wiring har-
ness assembly (the wiring harness connected to the G and yaw
rate sensor connector and intermediate connector E-123), cut
and repair the defective wire so that the frayed end of the twisted
wire should be within 10 cm (4.0 inches). If it exceeds 10 cm (4.0
inches), twist the wiring harness just like the original twisted
wire. If the frayed end exceeds 10 cm (4.0 inches), a communica-
tion error may be caused.
CAUTION
If there is a problem in the CAN bus line or the connectors on the
control wiring harness assembly (the wiring harness connected
to the M-ASTC-ECU, the power control module and intermediate
connector E-123), do not attempt to repair the wiring harness or
connector(s), but replace the wiring harness assembly. If a wire
is added or the connector(s) are repaired, an error in the CAN
communication may be caused.
Q: Are G and yaw rate sensor connector E-126 and intermediate
connector E-123 in good condition?
YES : Go to Step 2.
NO :
• If there is a problem at the transmission wiring harness
assembly side, repair or replace the connector.
•
If there is a problem at the control wiring harness
assembly side, replace the control wiring harness
assembly.
AC204176
CONNECTOR: E-123
AR
E-123(GR)
2
6
14
7
9 8
10
4
12
3
11
19
16
1817
15
1
5
13
E-123(GR)
AC204175
CONNECTOR: E-126
HARNESS SIDE
E-126(GR)
E-126(GR)
AB
FLOOR
CONSOLE
1
2
4 3
AC203824
CONNECTOR
TWISTED WIRE
AB
10 cm
(4.0 inches)
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-178
STEP 2. Check the CAN bus line for open circuit. Measure
at intermediate connector E-123 and G and yaw rate
sensor connector E-126.
CAUTION
Before checking CAN bus lines and their interconnected
components, "ground" yourself, by touching a metal
object such as an unpainted pipe, this will discharge any
potentially damaging static that may have built up.
CAUTION
When measuring resistance value or voltage in CAN bus
lines, use a digital multimeter. If not using a digital multim-
eter, the equipments connected through the CAN bus lines
may be damaged.
(1) Disconnect intermediate connector E-123 and G and yaw
rate sensor connector E-126, and measure the resistance
value between the intermediate connector and the G and
yaw rate sensor connector.
(2) Turn the ignition switch to the LOCK (OFF) position.
CAUTION
Disconnect the negative battery terminal when measuring
the resistance value in the CAN bus line. If you fail to do
so, the equipments connected through the CAN bus lines
may be damaged.
(3) Disconnect the negative battery terminal.
AC204176
CONNECTOR: E-123
AR
E-123(GR)
2
6
14
7
9 8
10
4
12
3
11
19
16
1817
15
1
5
13
E-123(GR)
AC204175
CONNECTOR: E-126
HARNESS SIDE
E-126(GR)
E-126(GR)
AB
FLOOR
CONSOLE
1
2
4 3
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-179
CAUTION
Always use the test harness when measuring the voltage
or resistance value at the female connector. If you fail to do
so, connectors may be damaged.
(4) Measure the resistance values between intermediate
connector E-123 terminal 2 and G and yaw rate sensor
connector E-126 terminal 2, and between intermediate
connector E-123 terminal 6 and G and yaw rate sensor
connector E-126 terminal 3.
• The resistance should measure 2 ohms or less.
CAUTION
If you repair the CAN bus line of the instrument panel wir-
ing harness assembly (the wiring harness connected to
the steering wheel sensor, the data link connector and the
resistor) and the transmission wiring harness assembly
(the wiring harness connected to the G and yaw rate sen-
sor connector and intermediate connector E-123), observe
the precautions regarding how to repair wiring harness. If
a new wire is added or a splice point is modified for the
CAN_L or CAN_H line, an error in the CAN communication
may be caused.
Q: Does the resistance measure 2 ohms or less?
YES : Go to Step 3.
Resistance does not measure 2 ohms or less> : Repair
the wiring harness wires between intermediate
connector E-123 and the G and yaw rate sensor
connector.
AC204582
HARNESS SIDE: E-124
AT
HARNESS SIDE: E-123
TEST
HARNESS
1
2
4 3
2
6
14
7
9 8
10
4
12
3
11
19
16
1817
15
1
5
13
TEST
HARNESS
AC204582
HARNESS SIDE: E-124
AU
HARNESS SIDE: E-123
TEST
HARNESS
1
2
4 3
2
6
14
7
9 8
10
4
12
3
11
19
16
1817
15
1
5
13
TEST
HARNESS
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-180
STEP 3. Check the wiring harness between intermediate
connector E-123 and the CAN main bus line.
NOTE: Also check the joint between the communication line
(connected to intermediate connector E-123) and the CAN
main bus line.
CAUTION
If there is a problem in the CAN bus line or the connectors
on the control wiring harness assembly (the wiring har-
ness connected to the M-ASTC-ECU, the power control
module and intermediate connector E-123), do not attempt
to repair the wiring harness or connector(s), but replace
the wiring harness assembly. If a wire is added or the con-
nector(s) are repaired, an error in the CAN communication
may be caused.
Q: Is the wiring harness between intermediate connector
E-123 and the CAN main bus line in good condition?
YES : Diagnose the G and yaw rate sensor. Refer to
NO : Replace the control wiring harness assembly.
SYMPTOM CHART
M1353001100030
AC204176
CONNECTOR: E-123
AR
E-123(GR)
2
6
14
7
9 8
10
4
12
3
11
19
16
1817
15
1
5
13
E-123(GR)
SYMPTOM
INSPECTION
PROCEDURE
NO.
REFERENCE
PAGE
Communication between the scan tool and the M-ASTC system is not
possible.
-
GROUP 13A
−
Diagnosis
Communication with scan tool is not possible. (Communication with
Active skid control system only is not possible.)
-
GROUP 35B
−
Diagnosis
The Active skid control system operation indicator light/Active traction
control system operation indicator light does not illuminate when the
ignition switch is on (but does not start the engine).
1
The Active skid control system OFF indicator light does not illuminate
when the ignition switch is on (but does not start the engine).
2
The Active skid control system operation indicator light/Active traction
control system operation indicator light does not go off after the engine
is started.
3
The Active skid control system OFF indicator light does not go off after
the engine is started.
4
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