Mitsubishi Evolution X. Manual - part 1129

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-151

DIAGNOSTIC ITEM 24: Diagnose when the scan tool cannot receive the data sent by combination 
meter.

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-152

.

FUNCTION

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

.

TROUBLE JUDGEMENT CONDITIONS

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

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1), combination meter connector improperly 
connected]

• Malfunction of the wiring harness [open circuit 

between the combination meter connector and 
the joint connector (CAN1), power supply circuit 
to the combination meter]

• Malfunction of the combination meter

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and 
combination meter connector C-04 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 combination 

meter connector C-04 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708950CB

C-04

C-105

Connectors: C-04, C-105

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-153

STEP 2. Check the wiring harness between joint connector 
(CAN1) C-105 and combination meter connector C-04.

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 combination 

meter connector C-04, and check the wiring harness.

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

C-105 (terminal 3) and combination meter connector C-04 
(terminal 14)

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

C-105 (terminal 14) and combination meter connector C-04 
(terminal 15)

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

C-105 and combination meter connector C-04 in good 
condition?
YES : Check the power supply circuit of the combination 

meter. Refer to GROUP 54A, combination meter 

− 

Diagnosis 

P.54A-59

.

NO :  Repair the wiring harness between joint connector 

(CAN1) C-105 and combination meter connector 
C-04.

AC709707

AC709707 CN

Harness side: C-105

Harness side: C-04

TEST HARNESS

TEST HARNESS

AC709707 CO

Harness side: C-105

Harness side: C-04

TEST HARNESS

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-154

DIAGNOSTIC ITEM 25: Short to power supply or ground in both CAN_H and CAN_L lines of the 
CAN-B bus lines.

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)