Mitsubishi Lancer (4A9 engine). Manual — part 258
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-56
STEP 17. M.U.T.-III CAN bus diagnostics
(checking the AS&G-ECU for internal short to
earth)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect C-64 AS&G-ECU connector, and diag-
nose the CAN bus line.
ACB01921AB
M.U.T.
JC
JC
SAS
KOS/
WCM
SRS
A/C
AUDIO
METER
AT/
CVT
EPS
ENGINE
ETACS
ABS/
ASC
MMCS
: Red section on screen
AS&G
Levelling
Cor ner
JC
OK: The display of the M.U.T.-III is as shown
in the figure.
Q: Does M.U.T.-III screen correspond to the
illustration?
YES :
Repair the wiring harness between C-64
AS&G-ECU connector and C-124 joint
connector (CAN3).
NO :
Check the transmission assembly
connector, and repair if necessary. If the
AS&G-ECU connector is in good condition,
replace the AS&G-ECU.
STEP 18. M.U.T.-III CAN bus diagnostics
(checking the engine-ECU for internal short to
earth)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect B-09 <Petrol> or B-40 <Diesel> engine-
ECU connector, and diagnose the CAN bus line.
ACB01921AB
M.U.T.
JC
JC
SAS
KOS/
WCM
SRS
A/C
AUDIO
METER
AT/
CVT
EPS
ENGINE
ETACS
ABS/
ASC
MMCS
: Red section on screen
AS&G
Levelling
Cor ner
JC
OK: The display of the M.U.T.-III is as shown
in the figure.
Q: Does M.U.T.-III screen correspond to the
illustration?
YES :
Repair the wiring harness between B-09
<Petrol> or B-40 <Diesel> engine-ECU
connector and C-124 joint connector
(CAN3).
NO :
Check the engine-ECU connector, and
repair if necessary. If the engine-ECU
connector is in good condition, replace the
engine-ECU.
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-57
Diagnosis Item 6: Diagnose when the M.U.T.-III cannot receive the data sent by steering wheel sensor
<vehicles with ASC or AFS>
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-58
AC709893
AM
Connector: C-03 <LHD>
AC701121BP
Connector: C-03 <RHD>
AC612708 AW
Connector: C-211 <LHD>
AC612716 AX
Connectors: C-211 <RHD>
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-59
FUNCTION
If the M.U.T.-III cannot communicate with the steer-
ing wheel sensor, this diagnosis result will be set.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the steering
wheel sensor, the ETACS-ECU determines that there
is a failure.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN2) or steering wheel sensor connector
improperly connected]
• Malfunction of the wiring harness [open circuit
between the steering wheel sensor and the joint
connector (CAN2), power supply circuit to the
steering wheel sensor]
• Faulty steering wheel sensor
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-03 joint connector
(CAN2) and C-211 steering wheel sensor
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-211
steering wheel sensor connector and C-03 joint
connector (CAN2)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect steering wheel sensor connector and
joint connector (CAN2), and check the following wir-
ing harness for open circuit.
(1) The wiring harness between C-211 steering
wheel sensor connector terminal No.3 and C-03
joint connector (CAN2) terminal No.9 <CAN_H>
OK: Continuity exists (2
Ω or less)
(2) The wiring harness between C-211 steering
wheel sensor connector terminal No.4 and C-03
joint connector (CAN2) 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
steering wheel sensor. Refer to GROUP
35C
− Troubleshooting .
NO :
Repair the wiring harness.
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