Mitsubishi Galant 9G. Manual — part 1341

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-468

STEP 11. Check A/C-ECU connector C-10 <manual air
conditioning system (low)> or C-15 <manual air
conditioning system (middle) or automatic air conditioning
system> 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 A/C-ECU connector C-10 <manual air conditioning

system (low)> or C-15 <manual air conditioning system
(middle) or automatic air conditioning system> in good
condition?
YES : Go to Step 12.
NO : Repair the damaged parts.

AC305234AB

C-10 HARNESS SIDE

C-15 HARNESS SIDE

CONNECTORS: C-10, C-15

C-10 (B)

C-15 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-469

STEP 12. Using scan tool MB991958, diagnose the CAN
bus line (Disconnect A/C-ECU connector C-10 <manual air
conditioning system (low)> or C-15 <manual air
conditioning system (middle) or automatic air conditioning
system>, and check the A/C-ECU system).
(1) Disconnect A/C-ECU connector C-10 <manual air

conditioning system (low)> or C-15 <manual air
conditioning system (middle) or automatic air conditioning
system>.

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

(3) Diagnose CAN bus lines, and check if the MUT-III screen is

as shown in the illustration.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Connect A/C-ECU connector C-10 <manual air conditioning

system (low)> or C-15 <manual air conditioning system
(middle) or automatic air conditioning system>.

Q: Does the MUT-III screen correspond to the illustration?

YES : If the MUT-III screen corresponds to the illustration,

go to Step 13 .

NO : If the MUT-III screen does not correspond to the

illustration, go to Step 14.

AC305234AB

C-10 HARNESS SIDE

C-15 HARNESS SIDE

CONNECTORS: C-10, C-15

C-10 (B)

C-15 (B)

AC306073

: Red section on screen

AE

MUT

ETACS

-ECU

AC-ECU

SRS-ECU

J/C

METER

-ECU

PCM

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-470

STEP 13. Check the CAN bus lines between joint
connector (3) and the A/C-ECU. Measure the resistance
between joint connector (3) C-02 and A/C-ECU connector
C-10 <manual air conditioning system (low)> or C-15
<manual air conditioning system (middle) or automatic air
conditioning system>.

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 A/C-ECU

connector C-10 <manual air conditioning system (low)> or
C-15 <manual air conditioning system (middle) or automatic
air conditioning system>, and measure the resistances at
the wiring harness sides of joint connector (3) C-02 and
A/C-ECU connector C-10 <manual air conditioning system
(low)> or C-15 <manual air conditioning system (middle) or
automatic air conditioning system>.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer
to

P.54C-4

.

(3) Disconnect the negative battery terminal.

AC305231AP

CONNECTOR: C-02

AC305234AB

C-10 HARNESS SIDE

C-15 HARNESS SIDE

CONNECTORS: C-10, C-15

C-10 (B)

C-15 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-471

(4) Measure the resistance between joint connector (3)

terminal 17 and A/C-ECU connector terminal 6 <manual air
conditioning system (low)> or 14 <manual air conditioning
system (middle) or automatic air conditioning system>.

OK: 2 ohms or less

AC204582CF

HARNESS SIDE: C-10

TEST
HARNESS

HARNESS SIDE: C-02

TEST HARNESS

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

AC204582

AC204582

HARNESS SIDE: C-02

TEST HARNESS

CG

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST
HARNESS

HARNESS SIDE: C-15