Mitsubishi Evolution X. Manual - part 1130

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-155

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

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-156

CAN Communication Circuit

ETACS-ECU

INTERFACE
CIRCUIT

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

HANDS FREE
MODULE

OCCUPANT 
CLASSIFICATION-
ECU

SATELLITE
RADIO 
TUNER

RADIO AND CD
PLAYER OR CD
CHANGER

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

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-157

.

FUNCTION

If a short to power supply or ground is present in both 
CAN_H and CAN_L lines, this diagnosis result will be 
set.

.

TROUBLE JUDGEMENT CONDITIONS

If a communication flag is set for the ETACS-ECU, 
no communication is present through the CAN-B 
line, and diagnostic trouble code U0019 is set, the 
ETACS-ECU determines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector (ETACS-ECU con-

nector improperly connected)

• Malfunction of the wiring harness (CAN_H and 

CAN_L lines are short to power supply or ground 
on the CAN-B line.)

• Malfunction of ECUs

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

AC708950CC

C-04

C-05

C-105

Connectors: C-04, C-05, C-105

AC708951CF

Connectors: C-07, C-11, C-15, C-18, C-22, 
C-37, C-107

C-07

C-15

C-18

C-22 (B)

C-11

C-37 (Y)

C-107

AC708972AY

Connector: C-301

ETACS-ECU

AC708954AW

Connector: D-39-2

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-158

STEP 1. Check the wiring harness between ETACS-ECU 
connector C-301 and body ground for a short to power 
supply. Measure the voltage at ETACS-ECU connector 
C-301.

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 ETACS-ECU connector C-301, and measure 

the voltage at the wiring harness side of ETACS-ECU 
connector.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between ETACS-ECU connector 

terminal 6 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between ETACS-ECU connector 

terminal 7 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 13.

AC608178

TEST 
HARNESS

Harness side: C-301

AL

AC608178

TEST 
HARNESS

Harness side: C-301

AM