Mitsubishi Lancer Evolution X. Manual — part 24

DIAGNOSIS

TSB Revision

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

TSB Revision

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

TSB Revision

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

TSB Revision

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)