Mitsubishi Lancer (4A9 engine). Manual - part 270

ACB02645

AP

C-04 (GR)

C-01

Connectors: C-01, C-04 <LHD>

ACB02647

AM

C-04 (GR)

C-01

Connectors: C-01, C-04 <RHD>

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-104

FUNCTION
If the M.U.T.-III cannot communicate with the combi-
nation meter, this diagnosis result will be set.

TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the combination 
meter, the ETACS-ECU determines that there is a 
failure.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1) or combination meter connector improp-
erly connected]

• Malfunction of the wiring harness [open circuit 

between the combination meter connector and 
the joint connector (CAN1), or power supply cir-
cuit to the combination meter]

• Malfunction of the combination meter

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-04 joint connector 
(CAN1) and C-01 combination meter connector

CAUTION

The strand end of the twist wire should be within 
10 cm from the connector. For details refer to .

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Check the wiring harness between C-01 
combination meter connector and C-04 joint 
connector (CAN1)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect combination meter connector and joint 
connector (CAN1), and check the following wiring 
harness for open circuit
(1) The wiring harness between C-01 combination 

meter connector terminal No.14 and C-04 joint 
connector (CAN1) terminal No.9 <CAN_H>

OK: Continuity exists (2 

Ω or less)

(2) The wiring harness between C-01 combination 

meter connector terminal No.15 and C-04 joint 
connector (CAN1) terminal No.20 <CAN_L>

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Check the power supply circuit of the 

combination meter. Refer to GROUP 54A 

− 

Combination meter 

− Troubleshooting .

NO : 

Repair the wiring harness.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-105

Diagnosis Item 21: Diagnose when the M.U.T.-III cannot receive the data sent by radio and CD player 
<vehicles with radio and CD player>

CAUTION

When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water 
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

CAN-B Communication Circuit

ETACS-ECU

INTERFACE 
CIRCUIT

CAN DRIVE 
CIRCUIT

SRS-ECU

CPU

WCM

CAN BOX UNIT

KOS-ECU

CAN 
TRANSCEIVER 
CIRCUIT

CAN DRIVE 
CIRCUIT

CAN DRIVE 
CIRCUIT

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

RADIO AND 
CD PLAYER

CAN 
TRANSCEIVER 
CIRCUIT

INTERFACE 
CIRCUIT

VEHICLES WITHOUT A/C

:

VEHICLES WITH A/C

:

VEHICLES WITH KOS

:

NOTE

VEHICLES WITH WCM

:

VEHICLES WITH RADIO AND CD PLAYER

:

VEHICLES WITHOUT AUDIO

:

VEHICLES WITH MMCS

:

COMBINATION 
METER

HEATER CONTROL
PANEL
A/C-ECU

SPARE 
CONNECTOR 
(FOR AUDIO)

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-106

ACB02645

AL

C-04 (GR)

Connector: C-04 <LHD>

ACB02647

AN

C-103

C-04 (GR)

Connectors: C-04, C-103 <RHD>

AC709894

AH

Connector: C-103 <LHD>

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-107

FUNCTION
If the M.U.T.-III cannot communicate with the radio 
and CD player, this diagnosis result will be set.

TROUBLE JUDGMENT CONDITIONS
If a communication flag is not set for the radio and 
CD player, the ETACS-ECU determines that there is 
a failure.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN1) or radio and CD player connector 
improperly connected]

• Malfunction of the wiring harness [open circuit 

between the radio and CD player connector and 
the joint connector (CAN1), power supply circuit 
of the radio and CD player]

• Malfunction of the radio and CD player

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-04 joint connector 
(CAN1) and C-103 radio and CD player connector

CAUTION

The strand end of the twist wire should be within 
10 cm from the connector. For details refer to .

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Check the wiring harness between C-103 
radio and CD player connector and C-04 joint 
connector (CAN1)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect radio and CD player connector and joint 
connector (CAN1), and check the following wiring 
harness for open circuit
(1) The wiring harness between C-103 radio and CD 

player connector terminal No.23 and C-04 joint 
connector (CAN1) terminal No.6 <CAN_H>

OK: Continuity exists (2 

Ω or less)

(2) The wiring harness between C-103 radio and CD 

player connector terminal No.33 and C-04 joint 
connector (CAN1) terminal No.17 <CAN_L>

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Check the power supply circuit of the radio 

and CD player. Refer to GROUP 54A 

− 

Radio and CD player 

− Troubleshooting .

NO : 

Repair the wiring harness.