Mitsubishi Evolution X. Manual — part 1109

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-71

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

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CONTROLLER AREA NETWORK (CAN)

54C-72

.

FUNCTION

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

.

TROUBLE JUDGEMENT CONDITIONS

The wiring harness wire or connectors may have
loose, corroded, or damage terminals, or terminals
pushed back in the connector, or an ECU may be
defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector (short to power sup-

ply in connector)

• Malfunction of the wiring harness (short to power

supply 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

AC708950BV

C-41

C-104

Connectors: C-41, C-104

AC708953AH

Connector: C-209

AC708972AY

Connector: C-301

ETACS-ECU

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-73

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 power supply. Measure the voltage at joint
connector (CAN2) C-104.
(1) Disconnect joint connector (CAN2), and measure the

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

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN2)

terminal 7 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN2)

terminal 20 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

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

AC709708

Harness side: C-104

AD

TEST
HARNESS

AC709708

Harness side: C-104

AE

TEST
HARNESS

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-74

STEP 2. Check the wiring harness between joint connector
(CAN2) C-104 and S-AWC-ECU connector C-41 for a short
to power supply. Measure the voltage at joint connector
(CAN2) C-104.
(1) Disconnect joint connector (CAN2), and measure the

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

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN2)

terminal 5 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN2)

terminal 16 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

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 power supply. Measure the voltage at joint connector
(CAN2) C-104.
(1) Disconnect joint connector (CAN2), and measure the

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

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN2)

terminal 6 and body ground.

OK: 4.7 volts or less

AC709708

TEST
HARNESS

Harness side: C-104

AF

AC709708

Harness side: C-104

AG

TEST
HARNESS

AC709708

TEST
HARNESS

Harness side: C-104

AH