Mitsubishi Galant (2004+). Manual - part 348

 

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Mitsubishi Galant (2004+). Manual - part 348

 

 

TEST EQUIPMENT

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-3

TEST EQUIPMENT

M1548304300054

MB991223

A: MB991219
B: MB991220
C: MB991221
D: MB991222

Harness set

A: test harness
B: LED harness
C: LED harness 

adaptor

D: Probe

General service tools Continuity check and voltage 

measurement at harness wire or 
connector for loose, corroded or 
damaged terminals, or terminals 
pushed back in the connector. 

A: Connector pin contact 

pressure inspection

B: Power circuit inspection
C: Power circuit inspection
D: Commercial tester connection

MB991970
ABS check harness

Measure the voltage and 
resistance at the ABS-ECU

TOOL

TOOL NUMBER 
AND NAME

SUPERSESSION

APPLICATION

MB991223

A

D

C

B

AD

MB991970

TEST EQUIPMENT

NAME

USE

Digital multimeter

Checking CAN bus circuit (for resistance and voltage 
measurements)

AC000019

SERVICE PRECAUTIONS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-4

SERVICE PRECAUTIONS

M1548302100043

WARNINGS IN DIAGNOSIS SECTION

DETAILS REGARDING WARNINGS

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 
connected to the CAN bus line may be damaged.

CAUTION

A digital multimeter should be used.

When measuring resistance value or voltage in 
CAN bus lines, use a digital multimeter. If not 
using a digital multimeter, the equipment 
connected through the CAN communication 
lines, may be damaged.

CAUTION

Disconnect the negative battery terminal.

Disconnect the negative battery terminal when 
measuring the resistance value in the CAN bus 
line. If you fail to do so, a component connected 
through the CAN communication lines may be 
damaged.

CAUTION

The test wiring harness should be used.

Always use the test harness when measuring the 
voltage or resistance value at the female 
connector. If you fail to do so, connectors may be 
damaged.

CAUTION

The strand end of the twisted wire should be 
within 10 cm (4 inches) from the connector.

If you repair the wire due to a defective 
connector or its terminal or harness wire, you 
should cut the wire so that the strand end of the 
twisted wire should be within 10 cm (4 inches) 
from the connector as shown. If it exceeds 10 cm 
(4 inches), twist the wiring harness just like the 
original twisted wire. If the strand end exceeds 
10 cm (4 inches), a communication error may be 
caused.

CAUTION

Strictly observe the specified wiring harness 
repair procedure.

When you repair a CAN bus line, observe the 
precautions on how to repair the CAN bus line 
strictly (Refer to 

P.54C-5

). If a new wire is added 

or a splice point is modified for the CAN_L or 
CAN_H line, an error in the CAN communication 
may be caused.

AC203824

CONNECTOR

TWISTED WIRE

AB

10 cm
 (4.0 inches)

PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-5

PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES

M1548301900057

.

Precautions on how to repair the CAN bus lines

• If the CAN_L or CAN_H line on the main bus line or sub-bus 

line is repaired, replace all the twisted wires between the 
end connectors. If the wiring harness is partially repaired, or 
only CAN_L or CAN_H line is repaired, noise suppression is 
deteriorated, causing a communication error.

• If the connector or wire on the main bus line or the sub-bus 

wire is replaced, the strand end of the twisted wire should 
be within 10 cm (4 inches) from the connector. If it exceeds 
10 cm (4 inches), twist the wiring harness just like the origi-
nal twisted wire. If the strand end exceeds 10 cm (4 inches), 
noise suppression is deteriorated, causing a communica-
tion error.

• If a sub-bus line is repaired, splice a new wire directly into 

the main bus line. If a new wire is spliced into the sub-bus 
line, which is connected to another device, the CAN com-
munication will be disabled.

.

AC204696

ADDED WIRE

NO GOOD

AB

AC203824

CONNECTOR

TWISTED WIRE

AB

10 cm
 (4.0 inches)

AC202856

ECU

ECU

ECU

ECU

GOOD

NO GOOD

OPEN
CIRCUIT
POINT

OPEN
CIRCUIT
POINT

AD

: MAIN BUS LINE

: SUB-BUS LINE

TERMINATOR RESISTOR

TERMINATOR RESISTOR

EXPLANATION ABOUT THE SCAN TOOL (MUT-III) CAN BUS DIAGNOSTICS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-6

Precautions on how to repair the terminator 
resistor
If one-side of the terminator resistors is broken, the 
CAN communication will continue, although noise 
suppression is deteriorated. In this case, no DTC 
may be set. Check the system regardless of whether 
a DTC is set or not. If damage is found, replace the 
terminator resistor.

EXPLANATION ABOUT THE SCAN TOOL (MUT-III) CAN 

BUS DIAGNOSTICS

M1548300100058

The MUT-III CAN bus diagnostics carries out the 
three checks below automatically, and then displays 
the current condition of the CAN bus lines according 
to the check results.

AC204700

GO TO ORDINARY DIAGNOSIS

SHORT IN CAN BUS LINE TO 
POWER SUPPLY OR GROUND

1. MUT-III CAN BUS 
    DIAGNOSTICS

(2) MEASURING RESISTANCE IN 
     CAN BUS LINE

OK

OK FOR (2) AND (3)
P CODE, B CODE, 
C CODE OR 
U CODE (CURRENT
TROUBLE)

OK FOR (2) AND (3)
U CODE (PAST TROUBLE)

NG FOR (2) OR (3)

NG

AE

FROM OTHER DIAGNOSIS

· OPEN CIRCUIT IN CAN BUS LINE
· BROKEN TERMINATOR RESISTOR
· POWER SUPPLY TO ECU POORLY 
  GROUNDED

2. PINPOINT POSSIBLE TROUBLE
    SPOT ACCORDING TO DTC CODE

(1) MEASURING VOLTAGE IN 
     CAN BUS LINE

(3) CHECK ECU WHICH MUT-III IS 
     COMMUNICATING WITH

 

 

 

 

 

 

 

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