Mitsubishi Evolution X. Manual - part 1123

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-127

DIAGNOSTIC ITEM 16: Diagnose when the scan tool cannot receive the data sent by WCM.

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-128

.

FUNCTION

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

.

TROUBLE JUDGEMENT CONDITIONS

If a communication flag is not set for the WCM, the 
ETACS-ECU determines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1), WCM connector improperly connected]

• Malfunction of the wiring harness [open circuit 

between the WCM connector and the joint con-
nector (CAN1), power supply circuit to the WCM]

• Malfunction of the WCM

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and WCM 
connector C-07 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 WCM connector 

C-07 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708951CD

Connector: C-07

C-07

AC708950

Connector: C-105

BL

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-129

STEP 2. Check the wiring harness between joint connector 
(CAN1) C-105 and WCM connector C-07 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 WCM 

connector C-07, and check the wiring harness.

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

C-105 (terminal 7) and WCM connector C-07 (terminal 11)

OK: Continuity exists (2 

Ω or less)

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

C-105 (terminal 20) and WCM connector C-07 (terminal 10)

OK: Continuity exists (2 

Ω or less)

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

C-105 and WCM connector C-07 in good condition?
YES : Check the power supply circuit of the WCM. Refer to 

GROUP 42C, WCM 

− Diagnosis 

P.42C-84

.

NO :  Repair the wiring harness between joint connector 

(CAN1) C-105 and WCM connector C-07.

AC709707 BX

Harness side: C-105

Harness side: C-07

TEST 
HARNESS

TEST 
HARNESS

AC709707 BY

Harness side: 
C-105

Harness side: C-07

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-130

DIAGNOSTIC ITEM 17: Diagnose when the scan tool cannot receive the data sent by SRS-ECU.

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)