Mitsubishi Lancer Evolution X. Manual - part 43

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-197

STEP 30. Using scan tool MB991958, diagnose the CAN 
bus line. (checking the A/C-ECU <vehicles with A/C> or 
heater control unit <vehicles without A/C> for internal 
failure)

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 A/C-ECU connector C-22 <vehicles with A/C> 

or heater control unit connector C-53 <vehicles without 
A/C>.

(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-198

(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 joint connector 

(CAN1) C-105 and A/C-ECU connector C-22 
<vehicles with A/C> or heater control unit connector 
C-53 <vehicles without A/C>.

NO :  Check A/C-ECU connector C-22 <vehicles with A/C> 

or heater control unit connector C-53 <vehicles 
without A/C>, and repair if necessary. If the A/C-ECU 
connector <vehicles with A/C> or heater control unit 
connector <vehicles without A/C> is in good 
condition, replace the A/C-ECU <vehicles with A/C> 
or heater control unit <vehicles without A/C>.

AC709542 AD

: Red section on screen

M.U.T.

J/C (3)

J/C (2)

ASC

ENGINE

ETACS

<M/T>

SAS

S-AWC

J/C (1)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

AC709543 AD

: Red section on screen

M.U.T.

J/C (3)

J/C (2)

ASC

LEVER

ETACS

<TC-SST>

SAS

S-AWC

J/C (4)

TC-SST

ENGINE

J/C (1)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-199

STEP 31. Using scan tool MB991958, diagnose the CAN 
bus line. (checking the radio and CD player or CD changer 
for internal failure)

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 radio and CD player or CD changer connector 

C-107.

(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-200

(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 joint connector 

(CAN1) C-105 and radio and CD player or CD 
changer connector C-107.

NO :  Check radio and CD player or CD changer connector 

C-107, and repair if necessary. If the radio and CD 
player or CD changer connector is in good condition, 
replace the radio and CD player or CD changer.

AC709542 AD

: Red section on screen

M.U.T.

J/C (3)

J/C (2)

ASC

ENGINE

ETACS

<M/T>

SAS

S-AWC

J/C (1)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

AC709543 AD

: Red section on screen

M.U.T.

J/C (3)

J/C (2)

ASC

LEVER

ETACS

<TC-SST>

SAS

S-AWC

J/C (4)

TC-SST

ENGINE

J/C (1)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER