Mitsubishi Montero (2004+). Manual — part 1118

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-183

This procedure diagnoses the shaded portion below.

AC203825AC

PROBABLE
TROUBLE
SPOT

G AND
YAW RATE
SENSOR

POWER TRAIN
CONTROL
MODULE

M-ASTC-ECU

STEERING
WHEEL
SENSOR

DATA LINK
CONNECTOR

RESISTOR

CAN Bus Communication Circuit (G and yaw rate sensor)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-184

.

CIRCUIT OPERATION
The M-ASTC-ECU receives signals through the CAN
bus line from the G and yaw rate sensor.

.

TECHNICAL DESCRIPTION (COMMENT)
If the M-ASTC-ECU has set DTC code 74, the wiring
harness between the CAN main bus line and the G
and yaw rate sensor, the G and yaw rate sensor itself
or the M-ASTC-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The CAN bus line between the CAN main bus

line and the G and yaw rate sensor is defective

• Damaged connector(s)

• The G and yaw rate sensor is defective.

• The M-ASTC-ECU is defective.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

AC204176

CONNECTOR: E-123

AT

E-123(GR)

AC204175

CONNECTOR: E-126

AD

E-126(GR)

FLOOR
CONSOLE

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-185

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 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.

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-186

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.
NO (If there is a problem at the control wiring harness
assembly side) : Replace the control wiring harness

assembly.

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
multimeter, 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