Mitsubishi Lancer (4A9 engine). Manual — part 262
AC709894
AE
Connector: C-114 <LHD>
AC701121BR
Connector: C-114 <RHD>
ACB02645
AH
Connector: C-124 <LHD>
C-124 (GR)
ACB02647
AE
C-124 (GR)
Connector: C-124 <RHD>
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-72
FUNCTION
If the M.U.T.-III cannot communicate with the electric
power steering-ECU, this diagnosis result will be set.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the electric
power steering-ECU, the ETACS-ECU determines
that there is a failure.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN3) or electric power steering-ECU connector
improperly connected]
• Malfunction of the wiring harness [open circuit
between the electric power steering-ECU and the
joint connector (CAN3), power supply circuit to
the electric power steering-ECU]
• Malfunction of the electric power steering-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-114 electric power
steering-ECU connector and C-124 joint
connector (CAN3)
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-114
electric power steering-ECU connector and C-
124 joint connector (CAN3)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect electric power steering-ECU connector
and joint connector (CAN3), and check the following
wiring harness for open circuit.
(1) The wiring harness between C-114 electric power
steering-ECU connector terminal No.4 and C-124
joint connector (CAN3) terminal No.6 <Petrol> or
7 <Diesel> <CAN_H>
OK: Continuity exists (2
Ω or less)
(2) The wiring harness between C-114 electric power
steering-ECU connector terminal No.3 and C-124
joint connector (CAN3) terminal No.17 <Petrol>
or 18 <Diesel> <CAN_L>
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Check the power supply circuit of the
electric power steering-ECU. Refer to
GROUP 37B
− Electric power steering −
Troubleshooting .
NO :
Repair the wiring harness.
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-73
Diagnosis Item 11: Diagnose when the M.U.T.-III cannot receive the data sent by A/T-ECU <A/T> or
CVT-ECU <CVT>
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-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-74
ACB02645
AI
C-35
Connectors: C-32, C-35, C-124 <LHD>
C-32 (GR)
C-124 (GR)
ACB02648
AE
Connector: C-35 <RHD>
ACB02647
AE
C-124 (GR)
Connector: C-124 <RHD>
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-75
FUNCTION
If the M.U.T.-III cannot communicate with the A/T-
ECU <A/T> or CVT-ECU <CVT>, this diagnosis
result will be set.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the A/T-ECU
<A/T> or CVT-ECU <CVT>, the ETACS-ECU deter-
mines that there is a failure.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN3) or A/T-ECU <A/T> or CVT-ECU <CVT>
improperly connected]
• Malfunction of the wiring harness [open circuit
between the A/T-ECU <A/T> or CVT-ECU <CVT>
and the joint connector (CAN3), power supply cir-
cuit to the A/T-ECU <A/T> or CVT-ECU <CVT>]
• Malfunction of the A/T-ECU <A/T> or CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-124 joint connector
(CAN3) and C-32 A/T-ECU connector <A/T> or C-
35 CVT-ECU connector <CVT>
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-32
A/T-ECU connector <A/T> or C-35 CVT-ECU
connector <CVT> and C-124 joint connector
(CAN3)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect shift lever connector and joint connector
(CAN3), and check the following wiring harness for
open circuit.
(1) The wiring harness between C-32 A/T-ECU <A/
T> or C-35 CVT-ECU <CVT> connector terminal
No.4 and C-124 joint connector (CAN3) terminal
No.8 <CAN_H>
OK: Continuity exists (2
Ω or less)
(2) The wiring harness between C-32 A/T-ECU <A/
T> or C-35 CVT-ECU <CVT> connector terminal
No.5 and C-124 joint connector (CAN3) terminal
No.19 <CAN_L>
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Check the power supply circuit of the CVT-
ECU <CVT> or A/T-ECU <A/T>. Refer to
GROUP 23A
− Troubleshooting <CVT> or
GROUP 23C
− Troubleshooting <A/T>.
NO :
Repair the wiring harness.
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