Mitsubishi Montero (2002-2004). Manual — part 1138

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-169

This procedure diagnoses the shaded portion below.

AC203825AF

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 (steering wheel sensor)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-170

.

CIRCUIT OPERATION
The M-ASTC-ECU receives signals through the CAN
bus line from the steering wheel sensor.

.

TECHNICAL DESCRIPTION (COMMENT)
If the M-ASTC-ECU has set DTC code 67, the wiring
harness between the CAN main bus line and the
steering wheel sensor, the steering wheel sensor
itself or the M-ASTC-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The CAN bus line between the CAN main bus

line and the steering wheel sensor is defective.

• Damaged connector(s)

• The steering wheel sensor is defective.

• The M-ASTC-ECU is defective.

AC204170

CONNECTOR: D-131

BV

AC204172

CONNECTOR: D-225

AH

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-171

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

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-172

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