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.