Mitsubishi Lancer Evolution X. Manual - part 26

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-129

DIAGNOSTIC ITEM 14: Diagnose the lines between joint connector (CAN3) and joint connector 
(CAN4). <TC-SST>

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.

TRANSAXLE 
ASSEMBLY

ENGINE CONTROL MODULE

CAN-C Communication Circuit <TC-SST>

ETACS-ECU

INTERFACE 
CIRCUIT

CAN DRIVE 
CIRCUIT

JOINT CONNECTOR 
(CAN2)

JOINT CONNECTOR 
(CAN3)

JOINT CONNECTOR 
(CAN4)

SHIFT LEVER

ASC-ECU

STEERING 
WHEEL SENSOR

AWC-ECU

NOTE

: THE TERMINAL NUMBERS DESCRIBED 

IN THE CIRCUIT DIAGRAM AGREE WITH 
THE NUMBERS MARKED ON THE 
TRANSAXLE ASSEMBLY CONNECTOR AND 
HARNESS SIDE CONNECTOR.

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-130

.

FUNCTION

If a failure is present in the wiring harness between 
the joint connector (CAN3) and the joint connector 
(CAN4), this diagnosis result will be set.

.

TROUBLE JUDGMENT CONDITIONS

If a communication flag is not set for some of the 
ECUs on the CAN-C line, the ETACS-ECU deter-
mines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN3), joint connector (CAN4) or intermediate 
connector failed]

• Malfunction of the wiring harness [open circuit 

between joint connector (CAN3) and joint con-
nector (CAN4)]

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN3) C-127, joint 
connector (CAN4) A-14 and intermediate connector A-13 
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 (CAN3) C-127, joint connector 

(CAN4) A-14 and intermediate connector A-13 in good 
condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708949AL

Connectors: A-13, A-14

A-14

A-13

AC708951CC

Connector: C-127

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-131

STEP 2. Check the wiring harness between joint connector 
(CAN3) C-127 and joint connector (CAN4) A-14 for open 
circuit.

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to 

P.54C-7

.

(1) Disconnect joint connector (CAN3) C-127 and joint 

connector (CAN4) A-14, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN3) 

C-127 (terminal 3) and joint connector (CAN4) A-14 
(terminal 5)

OK: Continuity exists (2 Ω or less)

(3) Check the wiring harness between joint connector (CAN3) 

C-127 (terminal 14) and joint connector (CAN4) A-14 
(terminal 16)

OK: Continuity exists (2 Ω or less)

Q: Is the wiring harness between joint connector (CAN3) 

C-127 and joint connector (CAN4) A-14 in good 
condition?
YES : The trouble can be an intermittent malfunction (Refer 

to GROUP 00, How to use 
Troubleshooting/inspection Service Points − How to 

Cope with Intermittent Malfunction 

P.00-15

).

NO :  Repair the wiring harness between joint connector 

(CAN3) C-127 and joint connector (CAN4) A-14.

AC709707BT

TEST 
HARNESS

Harness side: A-14

TEST 
HARNESS

Harness side: C-127

AC709707BU

Harness side: A-14

Harness side: C-127

TEST HARNESS

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-132

DIAGNOSTIC ITEM 15: Diagnose when the scan tool cannot receive the data sent by KOS-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)