Mitsubishi Evolution X. Manual - part 1127

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-143

.

FUNCTION

If the scan tool MB991958 cannot communicate with 
the CAN box unit, this diagnosis result will be set.

.

TROUBLE JUDGEMENT CONDITIONS

If a communication flag is not set for the CAN box 
unit, the ETACS-ECU determines that there is a fail-
ure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1), CAN box unit connector improperly con-
nected]

• Malfunction of the wiring harness [open circuit 

between the CAN box unit connector and the joint 
connector (CAN1), power supply circuit to the 
CAN box unit]

• Malfunction of the CAN box unit

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105, CAN box unit 
connector C-15 and intermediate connector C-108 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm 
(4 inches) from the connector. For details refer to 

P.54C-7

.

Q: Are joint connector (CAN1) C-105, CAN box unit 

connector C-15 and intermediate connector C-108 in 
good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708951BP

Connectors: C-15, C-108

C-15

C-108

AC708950

Connector: C-105

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DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-144

STEP 2. Check the wiring harness between joint connector 
(CAN1) C-105 and CAN box unit connector C-15 for open 
circuit.

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to 

P.54C-7

.

(1) Disconnect joint connector (CAN1) C-105 and CAN box unit 

connector C-15, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) 

C-105 (terminal 5) and CAN box unit connector C-15 
(terminal 8)

OK: Continuity exists (2 

Ω or less)

(3) Check the wiring harness between joint connector (CAN1) 

C-105 (terminal 16) and CAN box unit connector C-15 
(terminal 9)

OK: Continuity exists (2 

Ω or less)

Q: Is the wiring harness between joint connector (CAN1) 

C-105 and CAN box unit connector C-15 in good 
condition?
YES : Check the power supply circuit of the CAN box unit. 

Refer to GROUP 54A, Diagnosis <MMCS> 

P.54A-408

.

NO :  Repair the wiring harness between joint connector 

(CAN1) C-105 and CAN box unit connector C-15.

AC709707

AC709707 CH

Harness side: C-105

Harness side: C-15

TEST 
HARNESS

TEST HARNESS

AC709707 CI

Harness side: C-105

Harness side: C-15

TEST 
HARNESS

TEST 
HARNESS

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-145

DIAGNOSTIC ITEM 22: Diagnose when the scan tool cannot receive the data sent by satellite radio 
tuner.

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-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-146

.

FUNCTION

If the scan tool MB991958 cannot communicate with 
the satellite radio tuner, this diagnosis result will be 
set.

.

TROUBLE JUDGEMENT CONDITIONS

If a communication flag is not set for the satellite 
radio tuner, the ETACS-ECU determines that there is 
a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1), satellite radio tuner connector improp-
erly connected]

• Malfunction of the wiring harness [open circuit 

between the satellite radio tuner connector and 
the joint connector (CAN1), power supply circuit 
to the satellite radio tuner]

• Malfunction of the satellite radio tuner

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and satellite 
radio tuner connector C-18 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.

CAUTION

The strand end of the twisted wire should be within 10 cm 
(4 inches) from the connector. For details refer to 

P.54C-7

.

Q: Are joint connector (CAN1) C-105 and satellite radio 

tuner connector C-18 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

AC708951BX

Connector: C-18

AC708950

Connector: C-105

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