Mitsubishi Lancer Evolution X. Manual - part 16

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-89

STEP 12. Check the wiring harness between joint 
connector (CAN2) C-104 and ETACS-ECU connector C-301 
for short to power supply (voltage measurement).

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-7

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-7

.

CAUTION

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

P.54C-7

.

(1) Disconnect ETACS-ECU connector and joint connector 

(CAN2), and measure at the wiring harness side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN2) 

terminal 6 and body ground.

OK: 1 V or less

(4) Measure the voltage between joint connector (CAN2) 

terminal 19 and body ground.

OK: 1 V or less

Q: Do all the voltages measure 1 V or less?

YES : Check ETACS-ECU connector C-301, and repair if 

necessary. If the ETACS-ECU connector is in good 
condition, replace the ETACS-ECU.

NO :  Repair the wiring harness between ETACS-ECU 

connector C-301 and joint connector (CAN2) C-104.

AC709708

TEST 
HARNESS

Harness side: C-104

AH

AC709708

Harness side: C-104

AI

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-90

STEP 13. Using scan tool MB991958, diagnose the CAN 
bus line. (checking the ASC-ECU 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 ASC-ECU connector A-05.
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-91

(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 ASC-ECU 

connector A-05 and joint connector (CAN3) C-127.

NO :  Check ASC-ECU connector A-05, and repair if 

necessary. If the ASC-ECU connector is in good 
condition, replace the ASC-ECU.

AC709542 AC

: Red section on screen

M.U.T.

J/C (3)

J/C (2)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

ASC

ENGINE

J/C (1)

ETACS

<M/T>

SAS

S-AWC

AC709543 AC

: Red section on screen

M.U.T.

J/C (3)

J/C (2)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

ASC

LEVER

J/C (1)

ETACS

<TC-SST>

SAS

S-AWC

J/C (4)

TC-SST

ENGINE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-92

STEP 14. Using scan tool MB991958, diagnose the CAN 
bus line. (checking the ECM 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 ECM connector B-10.
(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 ECM connector 

B-10 and joint connector (CAN3) C-127 <M/T>, or 
check intermediate connector A-13, and repair if 
necessary. If the intermediate connector is in good 
condition, repair the wiring harness between ECM 
connector B-10 and joint connector (CAN4) A-14 
<TC-SST>.

NO :  Check ECM connector B-10, and repair if necessary. 

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

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AC709542 AC

: Red section on screen

M.U.T.

J/C (3)

J/C (2)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

ASC

ENGINE

J/C (1)

ETACS

<M/T>

SAS

S-AWC

AC709543 AC

: Red section on screen

M.U.T.

J/C (3)

J/C (2)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

ASC

LEVER

J/C (1)

ETACS

<TC-SST>

SAS

S-AWC

J/C (4)

TC-SST

ENGINE