Mitsubishi Lancer Evolution X. Manual - part 45

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-205

DIAGNOSTIC ITEM 26: Diagnose the ETACS-ECU, joint connector (CAN1) or lines between 
ETACS-ECU and joint connector (CAN1).

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

CAN DRIVE 
CIRCUIT

A/C-ECU

COMBINATION 
METER

SRS-ECU

WIRELESS 
CONTROL 
MODULE

KOS-ECU

NOTE

VEHICLES WITH WCM
VEHICLES WITH KOS

CAN DRIVE 
CIRCUIT

CAN DRIVE 
CIRCUIT

CAN DRIVE 
CIRCUIT

JOINT CONNECTOR 
(CAN1)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-206

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-207

.

FUNCTION

If a failure is present in the wiring harness wires 
between the ETACS-ECU connector, the joint con-
nector (CAN1), the ETACS-ECU connector and the 
joint connector (CAN1), this diagnosis result will be 
set.

.

TROUBLE JUDGMENT CONDITIONS

If a communication flag is set for none of the ECUs 
on the CAN-B line, the ETACS-ECU determines that 
there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1) or ETACS-ECU connector improperly 
connected]

• Malfunction of the wiring harness [open circuit 

between the ETACS-ECU connector and the joint 
connector (CAN1)]

• Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and 
EATCS-ECU connector C-301 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 ETACS-ECU 

connector C-301 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708950

Connector: C-105

BL

AC708972AY

Connector: C-301

ETACS-ECU

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-208

STEP 2. Check the wiring harness between joint connector 
(CAN1) C-105 and ETACS-ECU connector C-301.

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 ETACS-ECU 

connector C-301, and check the wiring harness.

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

C-105 (terminal 6) and ETACS-ECU connector C-301 
(terminal 6)

OK: Continuity exists (2 Ω or less)

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

C-105 (terminal 19) and ETACS-ECU connector C-301 
(terminal 7)

OK: Continuity exists (2 Ω or less)

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

C-105 and ETACS-ECU connector C-301 in good 
condition?
YES : Go to Step 3.
NO :  Repair the wiring harness between joint connector 

(CAN1) C-105 and ETACS-ECU connector C-301.

AC709707 CP

Harness side: C-105

Harness side: C-301

TEST 
HARNESS

TEST 
HARNESS

AC709707 CQ

Harness side: C-105

Harness side: C-301

TEST 
HARNESS

TEST 
HARNESS