Mitsubishi Evolution X. Manual - part 1114

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-91

.

FUNCTION

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

.

TROUBLE JUDGEMENT CONDITIONS

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

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN2), S-AWC-ECU connector or intermediate 
connector failed improperly connected]

• Malfunction of the wiring harness [open circuit 

between the S-AWC-ECU and the joint connector 
(CAN2), power supply circuit to the S-AWC-ECU]

• Malfunction of the S-AWC-ECU

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN2) C-104 and 
S-AWC-ECU connector C-46 and intermediate connector 
C-41 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 S-AWC-ECU 

connector C-46 and intermediate connector C-41 in 
good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708950BW

C-41

C-46

C-104

Connectors: C-41, C-46, C-104

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-92

STEP 2. Check the wiring harness between joint connector 
(CAN2) C-104 and S-AWC-ECU connector C-46 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 S-AWC-ECU 

connector C-46, and check the wiring harness.

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

C-104 (terminal 5) and S-AWC-ECU connector C-46 
(terminal 4)

OK: Continuity exists (2 

Ω or less)

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

C-104 (terminal 16) and S-AWC-ECU connector C-46 
(terminal 5)

OK: Continuity exists (2 

Ω or less)

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

C-104 and S-AWC-ECU connector C-46 in good 
condition?
YES : Check the power supply circuit of the S-AWC-ECU. 

Refer to GROUP 22A, Troubleshooting 

P.22A-11

 

<S-AWC>.

NO :  Repair the wiring harness between joint connector 

(CAN2) C-104 and S-AWC-ECU connector C-46.

AC709707

AC709707

Harness side: C-104

BH

TEST HARNESS

Harness side: C-46

TEST HARNESS

AC709707

Harness side: C-104

BI

Harness side: C-46

TEST HARNESS

TEST HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-93

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

S-AWC-ECU

ENGINE
CONTROL
MODULE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-94

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

S-AWC-ECU

NOTE

: THE TERMINAL NUMBERS DESCRIBED 

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