Mitsubishi Evolution X. Manual — part 1104

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-51

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

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-52

.

FUNCTION

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

.

TROUBLE JUDGEMENT CONDITIONS

If DTC U1120 is set, the ETACS-ECU determines
that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector (short to ground

inside connector)

• Malfunction of the wiring harness (short to ground

in the CAN-C main or sub bus lines)

• Malfunction of the ECU (ETACS-ECU, or ECUs

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

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-53

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• 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

• MB992110: Power plant ECU check harness

• MB991997: ASC Check Harness

STEP 1. Check the wiring harness between joint connector
(CAN2) C-104 and steering wheel sensor connector C-209
for a short to ground. Measure the resistance at joint
connector (CAN2) C-104.

CAUTION

Disconnect the negative battery terminal. For details refer
to

P.54C-7

.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-7

.

CAUTION

The test wiring harness should be used. For details refer to

P.54C-7

.

(1) Disconnect joint connector (CAN2), and measure the

resistance at the wiring harness side of joint connector
(CAN2).

(2) Measure the resistance between joint connector (CAN2)

terminal 7 and body ground.

OK: 1 kilo ohm or more

(3) Measure the resistance between joint connector (CAN2)

terminal 20 and body ground.

OK: 1 kilo ohm or more

Q: Do all the resistances measure 1 kilo ohm or more?

YES : Go to Step 2.
NO : Go to Step 10.

AC709707

Harness side: C-104

AP

TEST
HARNESS

AC709707AQ

TEST
HARNESS

Harness side: C-104

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-54

STEP 2. Check the wiring harness between joint connector
(CAN2) C-104 and S-AWC-ECU connector C-46 for a short
to ground. Measure the resistance at joint connector
(CAN2) C-104.

CAUTION

Disconnect the negative battery terminal. For details refer
to

P.54C-7

.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-7

.

CAUTION

The test wiring harness should be used. For details refer to

P.54C-7

.

(1) Disconnect joint connector (CAN2), and measure the

resistance at the wiring harness side of joint connector
(CAN2).

(2) Measure the resistance between joint connector (CAN2)

terminal 5 and body ground.

OK: 1 kilo ohm or more

(3) Measure the resistance between joint connector (CAN2)

terminal 16 and body ground.

OK: 1 kilo ohm or more

Q: Do all the resistances measure 1 kilo ohm or more?

YES : Go to Step 3.
NO : Go to Step 11.

STEP 3. Check the wiring harness between joint connector
(CAN2) C-104 and ETACS-ECU connector C-301 for a short
to ground. Measure the resistance at joint connector
(CAN2) C-104.

CAUTION

Disconnect the negative battery terminal. For details refer
to

P.54C-7

.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-7

.

AC709707

Harness side: C-104

AR

TEST
HARNESS

AC709707AS

TEST
HARNESS

Harness side: C-104