Mitsubishi Galant (2004+). Manual - part 432

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-339

STEP 28. 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-465

.

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-340

DIAGNOSTIC ITEM 8: Diagnose shorts between CAN_L and H lines <Vehicles with ABS and vehicles 
without 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

NOTE

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

ABS-ECU

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-341

.

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 may be defective

• The combination meter may be defective

• The A/C-ECU may be defective

• The SRS-ECU 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

AC305233 AU

CONNECTORS: C-10, C-15, C-22, C-121

C-121 (Y)

C-22 (Y)

C-10 (B)

C-15 (B)

AC305413

C-218 (GR)

CONNECTOR: C-218

AJ

JUNCTION BLOCK
(REAR VIEW)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-342

STEP 1. Check intermediate connector C-29 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 intermediate connector C-29 in good condition?

YES : Go to Step 2.
NO :  Repair the damaged parts.

AC305231AI

CONNECTOR: C-29