Mitsubishi Lancer Evolution X. Manual - part 31

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-149

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-356

.

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

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CONTROLLER AREA NETWORK (CAN)

54C-150

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)

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-151

.

FUNCTION

If the scan tool MB991958 cannot communicate with 
the CAN box unit, this diagnosis result will be set.

.

TROUBLE JUDGMENT CONDITIONS

If a communication flag is not set for the CAN box 
unit, the ETACS-ECU determines that there is a fail-
ure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1), CAN box unit connector improperly con-
nected]

• Malfunction of the wiring harness [open circuit 

between the CAN box unit connector and the joint 
connector (CAN1), power supply circuit to the 
CAN box unit]

• Malfunction of the CAN box unit

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105, CAN box unit 
connector C-15 and intermediate connector C-108 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, CAN box unit 

connector C-15 and intermediate connector C-108 in 
good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708951BP

Connectors: C-15, C-108

C-15

C-108

AC708950

Connector: C-105

BL

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-152

STEP 2. Check the wiring harness between joint connector 
(CAN1) C-105 and CAN box unit connector C-15 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 CAN box unit 

connector C-15, and check the wiring harness.

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

C-105 (terminal 5) and CAN box unit connector C-15 
(terminal 8)

OK: Continuity exists (2 Ω or less)

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

C-105 (terminal 16) and CAN box unit connector C-15 
(terminal 9)

OK: Continuity exists (2 Ω or less)

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

C-105 and CAN box unit connector C-15 in good 
condition?
YES : Check the power supply circuit of the CAN box unit. 

Refer to GROUP 54A, Diagnosis <MMCS> 

P.54A-457

.

NO :  Repair the wiring harness between joint connector 

(CAN1) C-105 and CAN box unit connector C-15.

AC709707

AC709707 CH

Harness side: C-105

Harness side: C-15

TEST 
HARNESS

TEST HARNESS

AC709707 CI

Harness side: C-105

Harness side: C-15

TEST 
HARNESS

TEST 
HARNESS