Mitsubishi Evolution X. Manual - part 1126

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-139

DIAGNOSTIC ITEM 20: Diagnose when the scan tool cannot receive the data sent by radio and CD 

player or CD changer.

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-B Communication Circuit

ETACS-ECU

INTERFACE
CIRCUIT

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

HANDS FREE
MODULE

OCCUPANT 
CLASSIFICATION-
ECU

SATELLITE
RADIO 
TUNER

RADIO AND CD
PLAYER

NOTE

VEHICLES WITHOUT MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS)
VEHICLES WITH MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS)

CAN
TRANSCEIVER
CIRCUIT

CAN BOX UNIT

JOINT CONNECTOR
(CAN1)

FRONT SEAT
ASSEMBLY (LH)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-140

.

FUNCTION

If the scan tool MB991958 cannot communicate with 
the radio and CD player or CD changer, this diagno-
sis result will be set.

.

TROUBLE JUDGEMENT CONDITIONS

If a communication flag is not set for the radio and 
CD player or CD changer, the ETACS-ECU deter-
mines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1), radio and CD player or CD changer con-
nector improperly connected]

• Malfunction of the wiring harness [open circuit 

between the radio and CD player or CD changer 
connector and the joint connector (CAN1), power 
supply circuit to the radio and CD player or CD 
changer]

• Malfunction of the radio and CD player or CD 

changer

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and radio and 
CD player or CD changer connector C-107 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 (CAN1) C-105 and radio and CD 

player or CD changer connector C-107 in good 
condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708950

Connector: C-105

BL

AC708951BD

Connector: C-107

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-141

STEP 2. Check the wiring harness between joint connector 
(CAN1) C-105 and radio and CD player or CD changer 
connector C-107 for open circuit.

CAUTION

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

P.54C-7

.

(1) Disconnect joint connector (CAN1) C-105 and radio and CD 

player or CD changer connector C-107, and check the 
wiring harness.

(2) Check the wiring harness between joint connector (CAN1) 

C-105 (terminal 5) and radio and CD player or CD changer 
connector C-107 (terminal 23)

OK: Continuity exists (2 

Ω or less)

(3) Check the wiring harness between joint connector (CAN1) 

C-105 (terminal 16) and radio and CD player or CD changer 
connector C-107 (terminal 33)

OK: Continuity exists (2 

Ω or less)

Q: Is the wiring harness between joint connector (CAN1) 

C-105 and radio and CD player or CD changer connector 
C-107 in good condition?
YES : Check the power supply circuit of the radio and CD 

player or CD changer. Refer to GROUP 54A, radio 
and CD player 

− Diagnosis <radio and CD player> 

P.54A-317

.

NO :  Repair the wiring harness between joint connector 

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

AC709707

AC709707 CF

Harness side: C-105

TEST 
HARNESS

Harness side: C-107

TEST HARNESS

AC709707 CG

Harness side: C-105

Harness side: C-107

TEST 
HARNESS

TEST HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-142

DIAGNOSTIC ITEM 21: Diagnose when the scan tool cannot receive the data sent by CAN box unit.

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-B Communication Circuit

ETACS-ECU

INTERFACE
CIRCUIT

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

HANDS FREE
MODULE

OCCUPANT 
CLASSIFICATION-
ECU

SATELLITE
RADIO 
TUNER

RADIO AND CD
PLAYER

NOTE

VEHICLES WITHOUT MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS)
VEHICLES WITH MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS)

CAN
TRANSCEIVER
CIRCUIT

CAN BOX UNIT

JOINT CONNECTOR
(CAN1)

FRONT SEAT
ASSEMBLY (LH)