Mitsubishi Lancer (4A9 engine). Manual — part 41
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-17
C102B
Abnormality in RR wheel speed sensor circuit
C1011
Abnormality in FL wheel speed sensor signal
C101C
Abnormality in FR wheel speed sensor signal
C1027
Abnormality in RL wheel speed sensor signal
C1032
Abnormality in RR wheel speed sensor signal
C1014
Mutual monitoring of FL wheel speed sensor
C101F
Mutual monitoring of FR wheel speed sensor
C102A
Mutual monitoring of RL wheel speed sensor
C1035
Mutual monitoring of RR wheel speed sensor
C1041
Abnormality in periodical signal for FL wheel speed sensor
C1042
Abnormality in periodical signal for FR wheel speed sensor
C1043
Abnormality in periodical signal for RL wheel speed sensor
C1044
Abnormality in periodical signal for RR wheel speed sensor
C1046
FL wheel speed sensor control phase time exceeded
C1047
FR wheel speed sensor control phase time exceeded
C1048
RL wheel speed sensor control phase time exceeded
C1049
RR wheel speed sensor control phase time exceeded
C104B
Abnormality in FL wheel inlet valve system
C104F
Abnormality in FR wheel inlet valve system
C1053
Abnormality in RL wheel inlet valve system
C1057
Abnormality in RR wheel inlet valve system
C105F
Abnormality in FL wheel outlet valve system
C1063
Abnormality in FR wheel outlet valve system
C1067
Abnormality in RL wheel outlet valve system
C105B
Abnormality in RR wheel outlet valve system
C1200
Abnormality in FL/RR wheel cut valve system
C1204
Abnormality in FR/RL wheel cut valve system
C1208
Abnormality in FL/RR wheel suction valve system
C120C
Abnormality in FR/RL wheel suction valve system
C2104
Faulty valve power supply circuit
C1073
Faulty motor drive circuit
C2116
Low or high power supply voltage in pump motor
C121D
Abnormality in brake fluid pressure sensor circuit
C121E
Abnormality in brake fluid pressure sensor output signal
C1000
Abnormality in stop lamp switch circuit
C123B
Prolonged operation of ASC
C2200
Abnormality in ASC-ECU
Diagnosis code
No.
Item
Reference page
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-18
C2101
Abnormality in battery
voltage (high voltage)
18.0
± 1.0 V or more
C1395
Brake fluid filling not completed
C121C
Torque request signal rejection
C1290
CAN time-out error
C2203
Chassis No. not programmed
C2206
Re-execution of variant coding
C123C
Abnormality in G and yaw
rate sensor output value
Abnormality in lateral G and
yaw rate output value
C2204
Internal abnormality in G and yaw rate sensor
C2111
Brake fluid pressure sensor
power supply circuit
Low input
C2112
Brake fluid pressure sensor
power supply circuit
High input
C2114
Abnormality in G and yaw
rate sensor operation voltage
Low voltage (below 6.5
± 0.5 V)
C2115
Abnormality in G and yaw
rate sensor operation voltage
High voltage (18.0
± 1.0 V or
more)
C123A
Abnormality in sensor calibration
C1219
Abnormality in steering wheel sensor signal
C121A
Abnormality in steering wheel
sensor calibration
Steering wheel sensor neutral
point not learned
C2205
Internal abnormality in steering wheel sensor
C2002
Valve calibration not completed
C2003
Control parameter not implement
C1608
Implausible diagnosis data
U0001
Bus-off
U0100
Engine time-out error
U0101
A/T or CVT time-out error
U0126
Steering wheel sensor time-out error
U0141
ETACS time-out error
U0125
G and yaw rate sensor message time-out error/message error
U0401
Engine signal malfunction detected
U0404
Abnormality in AS&G signal
U0428
Communication error in steering wheel sensor
U1003
G and yaw rate sensor bus-off
U1004
AS&G CAN time-out
U1415
Variant coding not implemented
U1417
Variant coding value invalid (includes faulty installation)
Diagnosis code
No.
Item
Reference page
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-19
DIAGNOSIS CODE PROCEDURES
Code No. C100A Abnormality in FL wheel speed sensor circuit
Wheel Speed Sensor Circuit
ASC-ECU
(LH)
(LH)
(RH)
(RH)
FRONT WHEEL SPEED SENSOR
REAR WHEEL SPEED SENSOR
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
ACB02565
AC612690
AP
Connector: A-08 <LHD>
A-08 (B)
AC701238 AE
Connectors: A-08, A-58 <RHD>
A-58 (B)
A-08 (B)
AC701229AH
Connector: A-58 <LHD>
A-58 (B)
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-20
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C
− CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with ASC-
ECU) is replaced, always carry out the calibra-
tion of the steering wheel sensor, the G and
yaw rate sensor and brake fluid pressure sen-
sor (Refer to
and
OPERATION
• The wheel speed sensor is a kind of a pulse gen-
erator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ASC-ECU. ASC-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU monitors the voltage fluctuation in each
wheel speed sensor circuit. If ASC-ECU detects the
open or short circuit in the circuit, it will set a diagno-
sis code.
PROBABLE CAUSES
Current trouble
• Damaged wiring harness and connectors
• Noise interference
• Malfunction of wheel speed sensor
• Malfunction of ASC-ECU
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
ASC-ECU and the wheel speed sensor. For diag-
nosis procedures, refer to How to treat past trou-
ble (GROUP 00
− How to Use Troubleshooting/
How to Treat Past Trouble ).
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the CAN bus lines (Refer to GROUP
54C
− CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No. C100A set?
YES :
Go to Step 3.
NO :
This diagnosis is complete.
STEP 3. M.U.T.-III data list
Check the following data list (Refer to
• Item No.01: FL wheel speed sensor
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Go to Step 4.
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