Mitsubishi Evolution X. Manual — part 1139

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-191

CAN-B Communication Circuit

ETACS-ECU

INTERFACE
CIRCUIT

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

HANDS FREE
MODULE

OCCUPANT
CLASSIFICATION-
ECU

SATELLITE
RADIO
TUNER

RADIO AND CD
PLAYER

NOTE

VEHICLES WITHOUT MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS)
VEHICLES WITH MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS)

CAN
TRANSCEIVER
CIRCUIT

CAN BOX UNIT

JOINT CONNECTOR
(CAN1)

FRONT SEAT
ASSEMBLY (LH)

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-192

.

FUNCTION

If a failure is present in the wiring harness wires
between the ETACS-ECU connector, the joint con-
nector (CAN1), the ETACS-ECU connector and the
joint connector (CAN1), this diagnosis result will be
set.

.

TROUBLE JUDGEMENT CONDITIONS

If a communication flag is set for none of the ECUs
on the CAN-B line, the ETACS-ECU determines that
there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector

(CAN1) or ETACS-ECU connector improperly
connected]

• Malfunction of the wiring harness [open circuit

between the ETACS-ECU connector and the joint
connector (CAN1)]

• Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and
EATCS-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 (CAN1) C-105 and ETACS-ECU

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

AC708950

Connector: C-105

BL

AC708972AY

Connector: C-301

ETACS-ECU

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-193

STEP 2. Check the wiring harness between joint connector
(CAN1) C-105 and ETACS-ECU connector C-301.

CAUTION

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

P.54C-7

.

(1) Disconnect joint connector (CAN1) C-105 and ETACS-ECU

connector C-301, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1)

C-105 (terminal 6) and ETACS-ECU connector C-301
(terminal 6)

OK: Continuity exists (2

Ω or less)

(3) Check the wiring harness between joint connector (CAN1)

C-105 (terminal 19) and ETACS-ECU connector C-301
(terminal 7)

OK: Continuity exists (2

Ω or less)

Q: Is the wiring harness between joint connector (CAN1)

C-105 and ETACS-ECU connector C-301 in good
condition?
YES : Go to Step 3.
NO : Repair the wiring harness between joint connector

(CAN1) C-105 and ETACS-ECU connector C-301.

AC709707 CP

Harness side: C-105

Harness side: C-301

TEST
HARNESS

TEST
HARNESS

AC709707 CQ

Harness side: C-105

Harness side: C-301

TEST
HARNESS

TEST
HARNESS

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-194

STEP 3. Using scan tool MB991958, diagnose the CAN bus
line. (trouble symptom check)

CAUTION

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

P.54C-7

.

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

MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as
shown in the figure.

Q: Does scan tool MB991958 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)