Mitsubishi Lancer (4A9 engine). Manual — part 264
CAN-C Communication Circuit <Except for RALLIART>
ETACS-ECU
INTERFACE
CIRCUIT
CAN DRIVE
CIRCUIT
ASC-ECU
A/T-ECU
ABS-ECU
CVT-ECU
STEERING
WHEEL SENSOR
<AFS, ASC>
ENGINE-ECU
ELECTRIC
POWER
STEERING-ECU
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
CORNER SENSOR/
BACK SENSOR-ECU
DIESEL
:
PETROL
:
1800-PETROL, 2000
:
NOTE
PETROL (EXCEPT SOHC)
:
VEHICLES WITHOUT ASC
:
VEHICLES WITH ASC
:
HEADLAMP
AUTOMATIC
LEVELLING-ECU
AS&G-ECU
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-80
AC709893
AM
Connector: C-03 <LHD>
AC701121BP
Connector: C-03 <RHD>
ACA00886
BE
Connector: C-301 <LHD>
ETACS-ECU
ACA00887
BF
Connector: C-301 <RHD>
ETACS-ECU
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-81
FUNCTION
If a failure is present in the wiring harness between
the ETACS-ECU connector and the joint connector
(CAN2), this diagnosis result will be set.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for any ECU con-
nected to CAN-C (CAN2 and CAN3), it is determined
that a failure has occurred.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN2) or ETACS-ECU connector improperly
connected]
• Malfunction of the wiring harness [open circuit
between the ETACS-ECU connector and the joint
connector (CAN2), power supply circuit to the
engine-ECU]
• Malfunction of the ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-03 joint connector
(CAN2) and C-301 ETACS-ECU 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-301
ETACS-ECU connector and C-03 joint connector
(CAN2)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect ETACS-ECU connector and joint con-
nector (CAN2), and check the following wiring har-
ness for open circuit
(1) The wiring harness between C-301 ETACS-ECU
connector terminal No.6 and C-03 joint connector
(CAN2) terminal No.11 <CAN_H>
OK: Continuity exists (2
Ω or less)
(2) The wiring harness between C-301 ETACS-ECU
connector terminal No.7 and C-03 joint connector
(CAN2) terminal No.22 <CAN_L>
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the wiring harness.
STEP 3. Trouble symptom check
Diagnose the CAN bus line, and check that normal
condition is displayed.
Q: Is the check result normal?
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-82
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Replace the ETACS-ECU.
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-83
Diagnosis Item 14: Diagnose the lines between joint connector (CAN2) and joint connector (CAN3)
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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