Mitsubishi Montero (2002-2004). Manual — part 1117

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-85

STEP 16. Check the resistance in the CAN_L 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, E-123, and M-

ASTC-ECU connector E-121, 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)

D-134(GR)

AE

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AC204194

CONNECTORS: E-121, E-122, E-123

E-123(GR)

E-123(GR)

E-122(L)

E-121

HARNESS SIDE

AK

E-121

E-122(L)

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M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-86

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 terminal 20 and body ground.

• The resistance should be infinite.

Q: Is the resistance infinite?

YES : Go to Step 17.
NO : Replace the control wiring harness assembly.

AC204581

FEMALE CONNECTOR: E-122

AG

TEST
HARNESS

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M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-87

STEP 17. Measure the voltage in the CAN_L 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 connector E-122 and M-ASTC-

ECU connector E-121, 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 20 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 : Replace the M-ASTC-ECU.
NO : Go to Step 18.

AC204194

CONNECTORS: E-121, E-122

E-121

HARNESS SIDE

E-121

E-122(L)

FEMALE CONNECTOR

AH

E-122(L)

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AC204580

FEMALE CONNECTOR: E-122

AB

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TEST
HARNESS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-88

STEP 18. Measure the voltage in the CAN_L 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 connector E-122 and power

control module connector D-134, 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 20 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 : Replace the power control module.
NO : Go to Step 19.

AC204171

CONNECTOR: D-134

HARNESS SIDE

D-134(GR)

D-134(GR)

AE

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8483

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8988

AC204176

CONNECTOR: E-122

E-122(L)

FEMALE SIDE

E-122(L)

AG

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AC204580

FEMALE CONNECTOR: E-122

AB

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TEST
HARNESS