Mitsubishi Lancer (4A9 engine). Manual — part 269
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-100
ACB02645
AL
C-04 (GR)
Connector: C-04 <LHD>
ACB02647
AL
C-139
C-04 (GR)
Connectors: C-04, C-139 <RHD>
AC709894
AG
Connectors: C-54, C-139 <LHD>
C-54
C-139
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-101
FUNCTION
If the M.U.T.-III cannot communicate with the CAN
box unit <vehicles with MMCS (vehicles for Rus-
sia)>, 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) or CAN box unit connector improperly
connected]
• Malfunction of the wiring harness [open circuit
between the CAN box unit connector and the joint
connector (CAN1), power supply circuit of the
CAN box unit]
• Malfunction of the CAN box unit
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-04 joint connector
(CAN1) and C-54 CAN box unit 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-54
CAN box unit connector and C-04 joint connector
(CAN1)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect CAN box unit connector and joint con-
nector (CAN1), and check the following wiring har-
ness for open circuit
(1) The wiring harness between C-54 CAN box unit
connector terminal No.8 and C-04 joint connector
(CAN1) terminal No.6 <CAN_H>
OK: Continuity exists (2
Ω or less)
(2) The wiring harness between C-54 CAN box unit
connector terminal No.9 and C-04 joint connector
(CAN1) terminal No.17 <CAN_L>
OK: Continuity exists (2
Ω or less)
NOTE: Check C-139 intermediate connector, and
repair if necessary.
Q: Is the check result normal?
YES :
Check the power supply circuit of the CAN
box unit. Refer to GROUP 54A
− MMCS −
Troubleshooting .
NO :
Repair the wiring harness.
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-102
Diagnosis Item 20: Diagnose when the M.U.T.-III cannot receive the data sent by combination meter
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-103
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