Mitsubishi Galant (2004+). Manual - part 439

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-367

(4) Measure the resistance between powertrain control module 

connector terminals 17 and 18.

OK: 1 k

Ω or more

CAUTION

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

P.54C-5

.

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step 

30  .

NO :  If the resistance measures less than 1 k

Ω, repair the 

wiring harness between powertrain control module 
connector and ABS-ECU connector.

STEP 30. Check the ABS-ECU for short circuit. Measure 

the resistance at ABS-ECU connector A-02.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

(1) Disconnect ABS-ECU connector A-02, and measure the 

resistance at the component side of ABS-ECU connector 
A-02.

(2) Measure the resistance between ABS-ECU connector 

terminals 7 and 25.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step 

31  .

NO :  If the resistance measures less than 1 k

Ω, replace the 

ABS-ECU.

AC209438

AC209438

AC209438

HARNESS SIDE: B-19

BC

TEST 
HARNESS

TEST 
HARNESS

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

AC209438

COMPONENT SIDE: A-02

TEST 
HARNESS

AB

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-368

STEP 31. Check the powertrain control module for short 
circuit. Measure the resistance at powertrain control 

module connector B-19.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

(1) Disconnect powertrain control module connector B-19, and 

measure the resistance at the component side of 
powertrain control module connector B-19.

(2) Measure the resistance between powertrain control module 

connector terminals 17 and 18.

OK: 120 

± 20 Ω

Q: Does the resistance measure 120 

± 20 Ω?

YES : If the resistance measures 120 

± 20 Ω, diagnose CAN 

bus lines thoroughly by referring to 

P.54C-498

.

NO :  If the resistance does not measure 120 

± 20 Ω, 

replace the powertrain control module.

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

AC209438

AC209438

AC209438

AC209438

COMPONENT SIDE: B-19

BD

TEST 
HARNESS

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-369

DIAGNOSTIC ITEM 9: Diagnose shorts between CAN_L and H lines <Vehicles with ABS and vehicles 
with multi-center display (middle-grade type)>

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.

DATA LINK
CONNECTOR

ETACS-ECU

POWERTRAIN
CONTROL 
MODULE

JOINT
CONNECTOR (3)

COMBINATION
METER

A/C-ECU

SRS-ECU

ABS-ECU

MULTI CENTER
DISPLAY UNIT

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-370

.

TROUBLE JUDGMENT
Short circuit may be present between the CAN_L 
and H lines when the resistance between the CAN 
bus lines (CAN_L and H lines) is less than 2 ohms.

.

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 a ECU may be 
defective.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The ETACS-ECU

• The combination meter may be defective

• The A/C-ECU may be defective

• The SRS-ECU may be defective

• The multi-center display unit (middle-grade type) 

may be defective

• The ABS-ECU may be defective

• The powertrain control module may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991970: ABS Check Harness

AC305206

CONNECTOR: A-02

AR

A-02 (GR)

AC306248AB

B-19 (B)

CONNECTOR: B-19

AIR
CLEANER

PCM

AC305231BZ

C-101

C-125 (B)

C-29

C-02

CONNECTORS: C-02, C-29, C-101, C-125

AC305233AV

CONNECTORS: C-05, C-15, C-22, C-121

C-121 (Y)

C-22 (Y)

C-15 (B)

C-05 (B)

AC305413

C-218 (GR)

CONNECTOR: C-218

AJ

JUNCTION BLOCK
(REAR VIEW)