Mitsubishi Montero (2002-2004). Manual — part 1125

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-117

STEP 20. Measure the voltage in the CAN_H line. 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 connectors E-122 and E-123 and

power control module connector D-123, and measure the
voltage at the female intermediate connector (control wiring
harness side).

(2) Turn the ignition switch to the "ON" position.

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.
(3) Measure the voltage between intermediate connector E-

122 terminal 9 and body ground.

• The voltage should measure 0.5 volts or more, or 4.5

volts or less.

Q: Does the voltage measure 0.5 volts or more, or 4.5 volts

or less?
YES : Go to Step 21.
NO : Replace the control wiring harness assembly.

AC204194

CONNECTORS: E-122, E-123

E-123(GR)

E-123(GR)

E-122(L)

HARNESS SIDE

AY

E-122(L)

2

6

14

7

9 8

10

4

12

3

11

19

16

1817

15

1

5

13

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AC204580

FEMALE CONNECTOR: E-122

AD

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST
HARNESS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-118

STEP 21. Check intermediate connector E-123.

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.

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 intermediate connector E-123 in good condition?

YES : Repair the wiring harness wires between intermediate

connector E-123 and the G and yaw rate sensor
connector.

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)

AC203824

CONNECTOR

TWISTED WIRE

AB

10 cm
(4.0 inches)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-119

Diagnostic Item 4: Diagnose the terminator resistor and 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, which
are connected through the CAN communication
lines, may be damaged.

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.

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 inter-
mediate 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)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-120

This procedure diagnoses the shaded portion below.

AC203825AB

CHECK POINT

G AND
YAW RATE
SENSOR

POWER TRAIN
CONTROL
MODULE

M-ASTC-ECU

STEERING
WHEEL
SENSOR

DATA LINK
CONNECTOR

RESISTOR

CAN Bus Communication Circuit (main bus line)