Mitsubishi Montero (2004+). Manual — part 1117

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-179

STEP 1. Check steering wheel sensor connector D-225 and
joint connector (9) D-131.

CAUTION

If there is a problem in the connector(s) (including termi-
nals) or wire(s) of the instrument panel wiring 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 har-
ness 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 communication error may be caused.
Q: Is steering wheel sensor connector D-225 and joint

connector (9) D-131 in good condition?
YES : Go to Step 2.
NO : Repair or replace the connector.

AC204170

CONNECTOR: D-131

AT

6

1

9 8

2

7

10

12 11

4

5

3

AC204172

CONNECTOR: D-225

HARNESS SIDE

AD

3 2

1

4

5

AC203824

CONNECTOR

TWISTED WIRE

AB

10 cm
(4.0 inches)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-180

STEP 2. Check the CAN bus line for open circuit. Measure
at joint connector (9) D-131 and steering wheel sensor
connector D-225.

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 joint connector (9) D-131 and steering wheel

sensor connector D-225, and measure the resistance
between joint connector (9) and the steering wheel 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.

AC204170

CONNECTOR: D-131

AT

6

1

9 8

2

7

10

12 11

4

5

3

AC204172

CONNECTOR: D-225

HARNESS SIDE

AD

3 2

1

4

5

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-181

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 joint connector (9)

D-131 terminal 2 and steering wheel sensor connector

D-225 terminal 3, and between joint connector (9) D-131
terminal 5 and steering wheel sensor connector D-225
terminal 4.

• 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 : Diagnose the steering wheel sensor. Refer to

P.35C-33

.

NO : Repair the wiring harness wires between joint

connector (9) and the steering wheel sensor
connector.

AC204582

HARNESS SIDE: D-225

AP

HARNESS SIDE: D-131

6

1

9 8

2

7

10

12 11

4

5

3

TEST
HARNESS

3 2

1

4

5

TEST
HARNESS

AC204582

HARNESS SIDE: D-225

AQ

HARNESS SIDE: D-131

6

1

9 8

2

7

10

12 11

4

5

3

TEST
HARNESS

3 2

1

4

5

TEST
HARNESS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-182

Diagnostic Item 7: CAN bus line diagnostics (between the main bus line and the G and yaw rate
sensor)

CAUTION

Prior to this diagnosis procedure, diagnose the
CAN main bus line.

CAUTION

Before checking CAN bus lines and their inter-
connected components, "ground" yourself, by
touching a metal object such as an unpainted
pipe, this will discharge any potentially damag-
ing 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 multimeter, the equipments con-
nected through the CAN bus lines may be dam-
aged.

CAUTION

Disconnect the negative battery terminal when
measuring the resistance value in the CAN bus
line. If you fail to do so, the equipments con-
nected through the CAN bus lines may be dam-
aged.

CAUTION

Always use the test harness when measuring the
voltage or resistance value at the female connec-
tor. If you fail to do so, connectors may be dam-
aged.

CAUTION

If there is a problem in the connector(s) (includ-
ing terminals) or wire(s) of the instrument panel
wiring harness assembly (the wiring harness
connected to the steering wheel sensor, the data
link connector and the resistor) and the trans-
mission wiring harness assembly (the wiring har-
ness 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 communication error may be
caused.

CAUTION

If you repair the CAN bus line of the instrument
panel wiring harness assembly (the wiring har-
ness connected to the steering wheel sensor, the
data link connector and the resistor) and the
transmission wiring harness assembly (the wir-
ing harness connected to the G and yaw rate
sensor 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.

CAUTION

If there is a problem in the CAN bus line or the
connectors on the control wiring harness assem-
bly (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.

AC203824

CONNECTOR

TWISTED WIRE

AB

10 cm
(4.0 inches)