Mitsubishi Lancer Evolution X. Manual — part 2

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-33

DIAGNOSTIC ITEM 2: Malfunction of the ETACS-ECU.

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, a component con-
nected to the CAN bus line may be broken.

.

FUNCTION

When the CAN bus diagnosis is carried out, the scan
tool sets communication "OK" flags in the patch
between the ETACS-ECU and active other ECUs. If
a commutation "OK" flag is not set for the ECUs
other than the ETACS-ECU, this diagnosis result will
be set.

.

TROUBLE JUDGEMENT CONDITIONS

If no communication flags are set for the ECUs (on
the CAN-B or CAN-C lines) other than the
ETACS-ECU, the ETACS-ECU determines that there
is a failure.

.

TROUBLESHOOTING HINT

Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A

Recheck for other system diagnostic trouble code.

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.
Check whether ETACS-ECU-related DTC is set.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES (The DTC other than the U code is set.) :

Troubleshoot the ETACS-ECU. Refer to GROUP 54A,
ETACS-ECU

P.54A-646

.

YES (Only U-code DTC is set.) : Check the power supply

circuit of the ETACS-ECU. Refer to GROUP 54A,
ETACS-ECU

P.54A-699

.

NO (The DTC is not set.) : Check the power supply circuit

of the ETACS-ECU. Refer to GROUP 54A,
ETACS-ECU

P.54A-699

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-34

DIAGNOSTIC ITEM 3: Abnormal short between the CAN-C bus lines.

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

AWC-ECU

ENGINE CONTROL
MODULE

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-35

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-36

.

FUNCTION

If a line-to-line short is present in the CAN-C lines,
this diagnosis result will be set.

.

TROUBLE JUDGMENT CONDITIONS

If only diagnostic trouble code U0001 is set, the
ETACS-ECU determines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector (joint connectors or

ECU connectors improperly connected)

• Malfunction of the wiring harness (line-to-line

short in the CAN-C main or sub bus lines)

• Malfunction of the ECU (ECU on CAN-C lines

failed)

AC708948

Connector: A-05

A-05 (B)

AB

AC708949AM

Connector: A-14

AC709137

Connectors: B-10, B-107

AC

B-10 (GR)

B-107 (B)

AC708951CB

Connectors: C-27, C-127

C-27

C-127

AC708950BU

C-46

C-104

Connectors: C-46, C-104

AC708953AH

Connector: C-209

AC708972AY

Connector: C-301

ETACS-ECU