Mitsubishi Evolution X. Manual - part 1109

DIAGNOSIS

TSB Revision

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

TSB Revision

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

TSB Revision

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

TSB Revision

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