Mitsubishi Evolution X. Manual - part 1117

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-103

STEP 2. Check the wiring harness between joint connector 
(CAN3) C-127 and ASC-ECU connector A-05 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 ASC-ECU 

connector A-05, and check the wiring harness.

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

C-127 (terminal 6) and ASC-ECU connector A-05 (terminal 
12)

OK: Continuity exists (2 

Ω or less)

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

C-127 (terminal 19) and ASC-ECU connector A-05 
(terminal 13)

OK: Continuity exists (2 

Ω or less)

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

C-127 and ASC-ECU connector A-05 in good condition?
YES : Check the power supply circuit of the ASC-ECU. 

Refer to GROUP 35C, Troubleshooting 

P.35C-243

.

NO :  Repair the wiring harness between joint connector 

(CAN3) C-127 and ASC-ECU connector A-05.

AC709707

Harness side: C-127

BN

Harness side: A-05

TEST 
HARNESS

TEST 
HARNESS

AC709707

Harness side: C-127

BO

Harness side: A-05

TEST 
HARNESS

TEST HARNESS

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-104

DIAGNOSTIC ITEM 10: Diagnose when the scan tool cannot receive the data sent by ECM.

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

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CONTROLLER AREA NETWORK (CAN)

54C-105

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.

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-106

.

FUNCTION

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

.

TROUBLE JUDGEMENT CONDITIONS

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

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN3) <M/T>, joint connector (CAN4) 
<TC-SST>, ECM connector or intermediate con-
nector <TC-SST> improperly connected]

• Malfunction of the wiring harness [open circuit 

between the ECM connector and the joint con-
nector (CAN3) <M/T> or the joint connector 
(CAN4) <TC-SST>, power supply circuit to the 
ECM]

• Malfunction of the ECM

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• MB992110: Power plant ECU check harness

STEP 1. Check joint connector (CAN3) C-127 <M/T>, joint 
connector (CAN4) A-14 <TC-SST>, ECM connector B-10 
and intermediate connector A-13 <TC-SST> 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 <M/T>, joint 

connector (CAN4) A-14 <M/T>, ECM connector B-10 and 
intermediate connector A-13 <TC-SST> in good 
condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708949AL

Connectors: A-13, A-14

A-14

A-13

AC709137

Connector: B-10

AB

C-10 (GR)

AC708951CC

Connector: C-127