Mitsubishi Lancer (4A9 engine). Manual — part 268
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-96
ACB02645
AL
C-04 (GR)
Connector: C-04 <LHD>
ACB02647
AH
C-04 (GR)
Connector: C-04 <RHD>
AC709894
AF
Connector: C-15 <LHD>
C-15 (B)
AC701121BT
Connector: C-15 <RHD>
C-15 (B)
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-97
FUNCTION
If the M.U.T.-III cannot communicate with the heater
control unit <vehicles without A/C> or A/C-ECU
<vehicles with A/C>, this diagnosis result will be set.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the heater con-
trol unit <vehicles without A/C> or A/C-ECU <vehi-
cles with A/C>, the ETACS-ECU determines that
there is a failure.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN1) or heater control unit <vehicles without A/
C> or A/C-ECU <vehicles with A/C> connector
improperly connected]
• Malfunction of the wiring harness [open circuit
between the heater control unit <vehicles without
A/C> or A/C-ECU <vehicles with A/C> connector
and the joint connector (CAN1), or power supply
circuit to the heater control unit <vehicles without
A/C> or A/C-ECU <vehicles with A/C>]
• Malfunction of the heater control unit <vehicles
without A/C> or A/C-ECU <vehicles with A/C>
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-04 joint connector
(CAN1) and C-60 heater control unit connector
<vehicles without A/C> or C-15 A/C-ECU
connector <vehicles with A/C>
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-60
heater control unit connector <vehicles without
A/C> or C-15 A/C-ECU connector <vehicles with
A/C> and C-04 joint connector (CAN1)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect heater control unit connector <vehicles
without A/C> or A/C-ECU connector <vehicles with
A/C> and joint connector (CAN1), and check the fol-
lowing wiring harness for open circuit
(1) The wiring harness between C-60 heater control
unit connector <vehicles without A/C> or C-15 A/
C-ECU connector <vehicles with A/C> terminal
No.11 and C-04 joint connector (CAN1) terminal
No.8 <CAN_H>
OK: Continuity exists (2
Ω or less)
(2) The wiring harness between C-60 heater control
unit connector <vehicles without A/C> or C-15 A/
C-ECU connector <vehicles with A/C> terminal
No.12 and C-04 joint connector (CAN1) terminal
No.19 <CAN_L>
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-98
YES :
Check the power supply circuit of the heater
control unit <vehicles without A/C> or A/C-
ECU <vehicles with A/C>. Refer to GROUP
55A, Manual A/C Diagnosis or GROUP
55B, Auto A/C Diagnosis .
NO :
Repair the wiring harness.
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-99
Diagnosis Item 19: Diagnose when the M.U.T.-III cannot receive the data sent by CAN box unit
<vehicles with MMCS (vehicles for Russia)>
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.
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