Mitsubishi Outlander GS45X. Manual - part 1283

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-77

STEP 13. Using scan tool MB991958, diagnose the CAN 
bus line. (checking the ABS-ECU <vehicles without ASC> 
or ASC-ECU <vehicles with ASC> for internal short to 
ground)

CAUTION

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

P.54C-7

.

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) Disconnect ABS-ECU connector A-01 <vehicles without 

ASC> or ASC-ECU connector A-02 <vehicles with ASC>.

(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.

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

MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as 
shown in the figure.

Q: Does scan tool MB991958 screen correspond to the 

illustration?
YES : Repair the wiring harness between ABS-ECU 

connector A-01 <vehicles without ASC> or ASC-ECU 
connector A-02 <vehicles with ASC> and joint 
connector (CAN3) C-01.

NO :  Check ABS-ECU connector A-01 <vehicles without 

ASC> or ASC-ECU connector A-02 <vehicles with 
ASC>, and repair if necessary. If the ABS-ECU 
connector <vehicles without ASC> or ASC-ECU 
connector <vehicles with ASC> is in good condition, 
replace the ABS-ECU <vehicles without ASC> or 
ASC-ECU <vehicles with ASC>.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB

ACA02847AC

: Red section on screen

M.U.T.

F.A.S.T.
/WCM

SRS

OCM

A/C

AUDIO

MMCS

Sat Radio

METER

JC

ETACS

JC

JC

SAS

AWC

ABS/ASC

AT/CVT

ENGINE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-78

STEP 14. Using scan tool MB991958, diagnose the CAN 
bus line. (checking the TCM for internal short to ground)

CAUTION

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

P.54C-7

.

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) Disconnect TCM connector C-38.
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.

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

MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as 
shown in the figure.

Q: Does scan tool MB991958 screen correspond to the 

illustration?
YES : Repair the wiring harness between TCM connector 

C-38 and joint connector (CAN3) C-01.

NO :  Check TCM connector C-38, and repair if necessary. 

If the TCM connector is in good condition, replace the 
TCM.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB

ACA02847AC

: Red section on screen

M.U.T.

F.A.S.T.
/WCM

SRS

OCM

A/C

AUDIO

MMCS

Sat Radio

METER

JC

ETACS

JC

JC

SAS

AWC

ABS/ASC

AT/CVT

ENGINE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-79

DIAGNOSTIC ITEM 6: Diagnose when the scan tool cannot receive the data sent by AWD-ECU 
<Electronic controlled AWD>.

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

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-80

.

FUNCTION

If the scan tool MB991958 cannot communicate with 
the AWD-ECU, this diagnosis result will be set.

.

TROUBLE JUDGMENT CONDITIONS

If a communication flag is not set for the AWD-ECU, 
the ETACS-ECU determines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN2) or AWD-ECU connector improperly con-
nected]

• Malfunction of the wiring harness [open circuit 

between the AWD-ECU and the joint connector 
(CAN2), power supply circuit to the AWD-ECU]

• Malfunction of the AWD-ECU

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN2) C-04, AWD-ECU 
connector C-128, intermediate connector C-138 and 
intermediate connector C-31 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-7

.

Q: Are joint connector (CAN2) C-04, AWD-ECU connector 

C-128, intermediate connector C-138 and intermediate 
connector C-31 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC901075 AQ

C-04

C-31

Connectors: C-04, C-31, C-128, C-138

C-128

C-138 (BR)