Mitsubishi Lancer Evolution X. Manual - part 28

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-137

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-91

.

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-138

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)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-139

.

FUNCTION

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

.

TROUBLE JUDGMENT CONDITIONS

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

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1), SRS-ECU connector improperly con-
nected]

• Malfunction of the wiring harness [open circuit 

between the SRS-ECU connector and the joint 
connector (CAN1), power supply circuit to the 
SRS-ECU]

• Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and SRS-ECU 
connector C-37 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 SRS-ECU 

connector C-37 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708951AC

C-37 (Y)

Connector: C-37

AC708950

Connector: C-105

BL

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-140

STEP 2. Check the wiring harness between joint connector 
(CAN1) C-105 and SRS-ECU connector C-37 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 SRS-ECU 

connector C-37, and check the wiring harness.

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

C-105 (terminal 8) and SRS-ECU connector C-37 (terminal 
15)

OK: Continuity exists (2 Ω or less)

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

C-105 (terminal 21) and SRS-ECU connector C-37 
(terminal 16)

OK: Continuity exists (2 Ω or less)

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

C-105 and SRS-ECU connector C-37 in good condition?
YES : Check the power supply circuit of the SRS-ECU. 

Refer to GROUP 52B, SRS − Troubleshooting 

P.52B-383

.

NO :  Repair the wiring harness between joint connector 

(CAN1) C-105 and SRS-ECU connector C-37.

AC709707

AC709707 BZ

Harness side: C-105

Harness side: C-37

TEST HARNESS

TEST 
HARNESS

AC709707 CA

Harness side: C-105

Harness side: C-37

TEST HARNESS

TEST 
HARNESS