Mitsubishi Galant 9G. Manual - part 1371

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-588

.

A/C-ECU

A/C-ECU

JOINT
CONNECTOR (3)

COMBINATION
METER

A/C-ECU

A/C-ECU

A/C-ECU

POWERTRAIN
CONTROL MODULE

<WITH ELECTRONIC BRAKE-FORCE DISTRIBUTION (EBD)
 AND ANTI-LOCK BRAKING SYSTEM (ABS)>

:MANUAL AIR CONDITIONING SYSTEM <LOW>
:MANUAL AIR CONDITIONING SYSTEM <MIDDLE>
 OR AUTOMATIC AIR CONDITIONING SYSTEM

NOTE 

ABS-ECU

AC305231BD

CONNECTOR: C-02

AC305233 AK

C-10 (B)

C-15 (B)

CONNECTORS: C-10, C-15

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-589

TROUBLE JUDGMENT

If the MUT-III cannot received signals from the 

A/C-ECU, CAN bus line connector(s) are broken or 

an open circuit has occurred.

.

COMMENTS ON TROUBLE SYMPTOM

The wiring harness wire or connectors may have 

loose, corroded, or damage terminals, or terminals 

pushed back in the connector, or the A/C-ECU may 

be defective.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

loose, corroded, or damage terminals, or termi-

nals pushed back in the connector

• The A/C-ECU may be defective

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-590

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check 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> 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

.

Check the joint connector at the wiring harness side for loose, 

corroded or damaged terminals, or terminals pushed back in 

the connector, and also check the short pin behind the connec-

tor for corrosion, deformation and delamination.
Q: Are 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> in good condition?
YES : . Go to Step 2.

NO : . Repair the damaged parts. Replace the joint 

connector as necessary.

AC305231AP

CONNECTOR: C-02

AC305234AB

C-10 HARNESS SIDE

C-15 HARNESS SIDE

CONNECTORS: C-10, C-15

C-10 (B)

C-15 (B)

AC209350

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AB

SHORT PIN

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-591

STEP 2. 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)