Mitsubishi Montero (2002-2004). Manual - part 1134

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-153

STEP 28. Check the CAN bus line for short circuit. Measure at
joint connector (9) D-131.

CAUTION

Before checking CAN bus lines and their interconnected compo-
nents, "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 multimeter, the
equipments, which are connected through the CAN communica-
tion lines, may be damaged.
(1) Disconnect joint connector (9) D-131 and intermediate connector

E-122, and measure the resistance at joint connector (9).

(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, which are connected through the CAN communica-
tion lines, may be damaged.
(3) Disconnect the negative battery terminal.

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 between joint connector (9) D-131

terminals 6 and 11.

• The resistance should be infinite.

CAUTION

If you repair the CAN bus line of the instrument panel wiring har-
ness 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 con-
nected 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 com-
munication may be caused.
Q: Is the resistance infinite?

YES : Retest the system.
NO : Repair the wiring harness wires between joint connector (9)

and the intermediate connector.

AC204170

CONNECTOR: D-131

9 8

12 11

AC204176

CONNECTOR: E-122

E-122(L)

MALE SIDE

E-122(L)

AC204738

HARNESS SIDE: D-131

TEST
HARNESS

9 8

12 11

TEST
HARNESS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-154

STEP 29. Check steering wheel sensor connector D-225.

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 in good

condition?
YES : Replace the steering wheel sensor.
NO : Repair or replace the connector(s).

AC204172

CONNECTOR: D-225

HARNESS SIDE

3 2

AC203824

CONNECTOR

TWISTED WIRE

10 cm
(4.0 inches)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-155

STEP 30. Check the terminator resistor inside the M-ASTC-
ECU. Check at intermediate connector E-122.

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, which are connected through the
CAN communication lines, may be damaged.
(1) Disconnect intermediate connector E-122, and measure the

resistance at the female intermediate connector (control
wiring harness side).

(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, which are connected through the CAN
communication lines, may be damaged.
(3) Disconnect the negative battery terminal.

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 between intermediate connector E-

122 terminals 9 and 20.

• The resistance should measure 120 ± 12 ohms.

Q: Does the resistance measure 120

± 12 ohms?

YES : Retest the system.
NO :

• If the resistance is infinite, replace the control

wiring harness assembly.

• If the resistance measures 2 ohms or less, go to

Step 31.

AC204176

CONNECTOR: E-122

E-122(L)

FEMALE SIDE

E-122(L)

AC204581

FEMALE CONNECTOR: E-122

TEST
HARNESS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-156

STEP 31. Check for short circuit at the M-ASTC-ECU.
Check at intermediate connector E-122.

CAUTION

power control module connector D-134, and measure the
resistance at the female intermediate connector (control
panel wiring harness side).

(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, which are connected through the CAN
communication lines, may be damaged.
(3) Disconnect the negative battery terminal.

AC204171

CONNECTOR: D-134

HARNESS SIDE

D-134(GR)

65
74

6261

8483

8988

AC204176

CONNECTOR: E-122

E-122(L)

FEMALE SIDE

E-122(L)

AC204176

CONNECTOR: E-123

E-123(GR)

9 8

1817

E-123(GR)

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