Mitsubishi Galant 9G. Manual - part 1370

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-584

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check joint connector (3) C-02 and 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

.

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 multi-center display 

unit (middle-grade type) connector C-05 in good 
condition?
YES : Go to Step 2.
NO :  Repair the damaged parts. Replace the joint 

connector as necessary.

AC305231AP

CONNECTOR: C-02

AC305233 AF

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

AC209350

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AB

SHORT PIN

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-585

STEP 2. Check the CAN bus lines between joint connector 
(3) and the multi-center display unit (middle-grade type). 
Measure the resistance between joint connector (3) C-02 
and multi-center display unit (middle-grade type) 
connector C-05.

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 
resistance at the wiring harness sides of joint connector (3) 
C-02 and multi-center display unit (middle-grade type) 
connector C-05.

(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

AC305233 AF

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-586

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

terminal 8 and multi-center display unit (middle-grade type) 
connector terminal 13.

OK: 2 ohms or less

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

terminal 19 and multi-center display unit (middle-grade 
type) connector terminal 12.

OK: 2 ohms or less

CAUTION

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

P.54C-5

.

Q: Do all the resistances measure 2 ohms or less?

YES : If all the resistances measure 2 ohms or less, power 

supply to the multi-center display (middle-grade type) 
may be suspected. Diagnose the multi-center display 
(middle-grade type). Refer to GROUP 54A, 

P.54A-252

.

NO :  If either of the resistances measures more than 2 

ohms or all the resistances measure more than 2 
ohms, repair the wiring harness between joint 
connector (3) and the multi-center display unit 
(middle-grade type) connector. 

AC204582

HARNESS SIDE: C-02

TEST 
HARNESS

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10 9

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20191817161514131211

TEST 
HARNESS

HARNESS SIDE: C-05

CJ

AC204582

HARNESS SIDE: C-02

CK

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10 9

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20191817161514131211

HARNESS SIDE: C-05

TEST 
HARNESS

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-587

DIAGNOSTIC ITEM 22: Diagnose the lines between CAN main bus line and the A/C-ECU.

CAUTION

When servicing a CAN bus line, ground yourself 
by touching a metal object such as an unpainted 
water pipe. If you fail to do so, a component con-
nected to the CAN bus line may be damaged.

JOINT
CONNECTOR (3)

COMBINATION
METER

A/C-ECU

POWERTRAIN
CONTROL MODULE

<WITHOUT ELECTRONIC BRAKE-FORCE DISTRIBUTION (EBD)
 AND ANTI-LOCK BRAKING SYSTEM (ABS)>

NOTE 

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