Mitsubishi Lancer Evolution X. Manual - part 19

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-101

DIAGNOSTIC ITEM 7: Diagnose when the scan tool cannot receive the data sent by steering wheel 
sensor.

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-C Communication Circuit <M/T>

ETACS-ECU

INTERFACE 
CIRCUIT

CAN DRIVE 
CIRCUIT

JOINT CONNECTOR 
(CAN2)

JOINT CONNECTOR 
(CAN3)

ASC-ECU

STEERING 
WHEEL SENSOR

AWC-ECU

ENGINE CONTROL 
MODULE

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-102

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

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CONTROLLER AREA NETWORK (CAN)

54C-103

.

FUNCTION

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

.

TROUBLE JUDGMENT CONDITIONS

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

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN2) or steering wheel sensor connector 
improperly connected]

• Malfunction of the wiring harness [open circuit 

between the steering wheel sensor and the joint 
connector (CAN2), power supply circuit to the 
steering wheel sensor]

• Malfunction of the steering wheel sensor

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN2) C-104 and steering 
wheel sensor connector C-209 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 (CAN2) C-104 and steering wheel 

sensor connector C-209 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708950BX

Connector: C-104

AC708953AH

Connector: C-209

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-104

STEP 2. Check the wiring harness between joint connector 
(CAN2) C-104 and steering wheel sensor connector C-209 
for open circuit.

CAUTION

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

P.54C-7

.

(1) Disconnect joint connector (CAN2) C-104 and steering 

wheel sensor connector C-209, and check the wiring 
harness.

(2) Check the wiring harness between joint connector (CAN2) 

C-104 (terminal 7) and steering wheel sensor connector 
C-209 (terminal 3)

OK: Continuity exists (2 Ω or less)

(3) Check the wiring harness between joint connector (CAN2) 

C-104 (terminal 20) and steering wheel sensor connector 
C-209 (terminal 4)

OK: Continuity exists (2 Ω or less)

Q: Is the wiring harness between joint connector (CAN2) 

C-104 and steering wheel sensor connector C-209 in 
good condition?
YES : Check the power supply circuit of the steering wheel 

sensor. Refer to GROUP 35C, Troubleshooting 

P.35C-196

.

NO :  Repair the wiring harness between joint connector 

(CAN2) C-104 and steering wheel sensor connector 
C-209.

AC709707

AC709707

Harness side: C-104

BJ

Harness side: C-209

TEST 
HARNESS

TEST HARNESS

AC709707

Harness side: C-104

BK

Harness side: C-209

TEST 
HARNESS

TEST 
HARNESS