Mitsubishi Lancer Evolution X. Manual - part 24

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-121

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-122

.

FUNCTION

If a failure is present in the wiring harness between 
the ETACS-ECU connector and the joint connector 
(CAN2), 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 

(CAN2) or ETACS-ECU connector improperly 
connected]

• Malfunction of the wiring harness [open circuit 

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

• Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN2) C-104 and 
ETACS-ECU connector C-301 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 ETACS-ECU 

connector C-301 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708950BX

Connector: C-104

AC708972AY

Connector: C-301

ETACS-ECU

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-123

STEP 2. Check the wiring harness between joint connector 
(CAN2) C-104 and ETACS-ECU connector C-301 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 ETACS-ECU 

connector C-301, and check the wiring harness.

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

C-104 (terminal 6) and ETACS-ECU connector C-301 
(terminal 9)

OK: Continuity exists (2 Ω or less)

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

C-104 (terminal 19) and ETACS-ECU connector C-301 
(terminal 8)

OK: Continuity exists (2 Ω or less)

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

C-104 and ETACS-ECU connector C-301 in good 
condition?
YES : Go to Step 3.
NO :  Repair the wiring harness between joint connector 

(CAN2) C-104 and ETACS-ECU connector C-301.

AC709707BP

Harness side: C-104

TEST 
HARNESS

Harness side: C-301

TEST 
HARNESS

AC709707BQ

Harness side: C-104

TEST 
HARNESS

Harness side: C-301

TEST 
HARNESS

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-124

STEP 3. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Diagnose CAN bus lines, and check if the scan tool screen 

is as shown in the illustration.

Q: Does the scan tool screen correspond to the 

illustration?
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 :  Replace the ETACS-ECU.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AC709542 AB

: Red section on screen

M.U.T.

J/C (3)

SAS

J/C (2)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

ASC

ENGINE

J/C (1)

ETACS

<M/T>

S-AWC

AC709543 AB

: Red section on screen

M.U.T.

J/C (3)

SAS

J/C (2)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

ASC

LEVER

ENGINE

J/C (1)

ETACS

<TC-SST>

S-AWC

TC-SST

J/C (4)