Mitsubishi Galant 9G. Manual — part 1258

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-136

STEP 19. Check the CAN_ H line (communication line only)
between the SRS-ECU connector and the intermediate
connector for a short circuit. Measure the voltage at
intermediate connector C-22.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to

P.54C-4

.

(1) Disconnect intermediate connector C-22 and SRS-ECU

connector C-121, and measure the voltage at the male side
of intermediate connector C-22 (at floor wiring harness
side).

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

(3) Measure the voltage between intermediate connector

terminal 22 and body ground.

OK: 1.0 V or less

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, diagnose CAN

bus lines thoroughly by referring to

P.54C-520

.

NO : If the voltage measures more than 1.0 V, repair the

wiring harness between intermediate connector C-22
and SRS-ECU connector.

AC305234AC

CONNECTORS: C-22, C-121

C-121 HARNESS SIDE

C-121 (Y)

C-22 (Y)

C-22

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21

22

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AC209365

AC209365FT

MAIL SIDE: C-22

TEST
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-137

STEP 20. Check the CAN_H line (communication line only)
between joint connector (3) and the intermediate
connector for a short circuit. Measure the voltage at joint
connector (3) C-02.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to

P.54C-4

.

(1) Disconnect intermediate connector C-22 and joint

connector (3) C-02, and measure the voltage at the wiring
harness side of joint connector (3) C-02.

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

(3) Measure the voltage between joint connector (3) terminals

3 and body ground.

OK: 1.0 V or less

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, diagnose CAN

bus lines thoroughly by referring to

P.54C-520

.

NO : If the voltage measures more than 1.0 V, repair the

wiring harness between intermediate connector C-22
and joint connector (3).

AC305231AP

CONNECTOR: C-02

AC305233 AI

CONNECTOR: C-22

C-22 (Y)

AC209365

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22

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2

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1

12

AC209365FU

HARNESS SIDE: C-02

TEST
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-138

STEP 21. Check the CAN_H line (communication line
including the multi-center display unit (middle-grade type))
between joint connector (3) and middle-grade multi-center
display connector for a short to the power supply. Measure
the voltage at joint connector (3) C-02.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to

P.54C-4

.

(1) Disconnect joint connector (3) C-02, and measure the

voltage at the wiring harness side of joint connector (3)
C-02.

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

(3) Measure the voltage between joint connector (3) terminal 8

and body ground.

OK: 4.0 V or less

Q: Does the voltage measure 4.0 V or less?

YES : If the voltage measures 4.0 V or less, go to Step 24.
NO : If the voltage measures more than 4.0 V, go to Step

22.

STEP 22. Check multi-center display unit (middle-grade
type) connector C-05 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to

P.54C-4

.

Q: Is multi-center display unit (middle-grade type)

connector C-05 in good condition?
YES : Go to Step 23.
NO : Repair the damaged parts.

AC305231AP

CONNECTOR: C-02

AC209365

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22

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1

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AC209365GG

HARNESS SIDE: C-02

TEST HARNESS

AC305233 AF

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-139

STEP 23. Check the CAN_H line (communication line only)
between joint connector (3) and multi-center display unit
(middle-grade type) connector for a short to the power
supply. Measure the voltage at joint connector (3) C-02.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to

P.54C-4

.

(1) Disconnect joint connector (3) C-02 and multi-center display

unit (middle-grade type) connector C-05, and measure the
voltage at the wiring harness side of joint connector (3)
C-02.

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

(3) Measure the voltage between joint connector (3) terminal 8

and body ground.

OK: 1.0 V or less

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, diagnose CAN

bus lines thoroughly by referring to

P.54C-520

.

NO : If the voltage measures more than 1.0 V, repair the

wiring harness between joint connector (3) and the
multi-center display unit (middle-grade type)
connector.

AC305231AP

CONNECTOR: C-02

AC305233 AF

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

AC209365

11

22

10

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19

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3

14

2

13

1

12

AC209365GG

HARNESS SIDE: C-02

TEST HARNESS