Mitsubishi Outlander GS45X. Manual — part 1275

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-45

STEP 15. Check the wiring harness between joint
connector (CAN2) C-04 and ETACS-ECU connector C-301
for line-to-line short. Measure the resistance at joint
connector (CAN2) C-04.
(1) Disconnect joint connector (CAN2) and ETACS-ECU

connector, and check that there is continuity at the harness
side of joint connector (CAN2).

(2) Check that there is continuity between joint connector

(CAN2) terminals 6 and 19.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 16.
NO : Repair the wiring harness between joint connector

(CAN2) C-04 and ETACS-ECU connector C-301.

AC703868AG

Test
harness

Test
harness

Harness side: C-04

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-46

STEP 16. Using scan tool MB991958, diagnose the CAN
bus line.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Diagnose CAN bus lines, and check if the scan tool screen

is as shown in the illustration.

Q: Does the scan tool screen correspond to the

illustration?
YES : The trouble can be an intermittent malfunction (Refer

to GROUP 00, How to use
Troubleshooting/inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-15

).

NO : Replace the ETACS-ECU.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB

ACA02847AB

: Red section on screen

M.U.T.

JC

JC

SAS

AWC

F.A.S.T.
/WCM

SRS

OCM

A/C

AUDIO

MMCS

Sat Radio

METER

ABS/ASC

AT/CVT

ENGINE

ETACS

JC

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-47

DIAGNOSTIC ITEM 4: Diagnose shorts in the ground to CAN-C bus line.

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 connected to the CAN bus line may be damaged.

CAN Communication Circuit

ETACS-ECU

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

STEERING WHEEL
SENSOR

AWD-ECU

AWC-ECU

JOINT CONNECTOR
(CAN2)

JOINT CONNECTOR
(CAN3)

TRANSAXLE
CONTROL MODULE

ASC-ECU

ABS-ECU

ENGINE CONTROL
MODULE

:VEHICLES WITHOUT ASC

NOTE

:VEHICLES WITH ASC

:6A/T

:CVT

:ELECTRONIC CONTROLLED AWD
:S-AWC

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-48

.

FUNCTION

If a short to ground is present in the CAN-C lines, this
diagnosis result will be set.

.

TROUBLE JUDGMENT CONDITIONS

If DTC U1120 is set, the ETACS-ECU determines
that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector (short to ground

inside connector)

• Malfunction of the wiring harness (short to ground

in the CAN-C main or sub bus lines)

• Malfunction of the ECU (ETACS-ECU, or ECUs

on CAN-C lines failed)

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

AC901112

Connectors: A-01, A-02

A-01 (B),
A-02 (B)

AD

AC901598

Connector: B-11

AB

B-11 (GR)

AC901075 AN

C-01

C-04

C-31

C-33

C-38

Connectors: C-01, C-04, C-31, C-33, C-38,
C-128, C-138, C-139

C-128,
C-139

C-138 (BR)

AC900844AV

Connector: C-209

ACA02655BB

Connector: C-301