Mitsubishi Lancer (4A9 engine). Manual — part 39
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-9
FAIL-SAFE FUNCTIONS
ASC-ECU constantly monitors the input and output
signals. If an error is detected in the system, ASC-
ECU sends a fail signal and the corresponding indi-
cator lamp is illuminated or blinks. Various controls
are processed depending on the cause of malfunc-
tion as shown below.
Illumination condition of warning lamp and display in case of failure
Diagnosis
code No.
Item
Brake
warning
lamp,
brake
warning
display
ABS warning
lamp,
ABS warning
display
ASC warning
lamp,
ASC warning
display
ASC OFF
display
ASC OFF
lamp
C100A
Abnormality in FL wheel speed
sensor circuit
OFF
*1
ON
*2
ON
ON
C1015
Abnormality in FR wheel speed
sensor circuit
C1020
Abnormality in RL wheel speed
sensor circuit
C102B
Abnormality in RR wheel speed
sensor circuit
C1011
Abnormality in FL wheel speed
sensor signal
OFF
*1
ON
*2
ON
ON
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
OFF
*1
ON
*2
ON
ON
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
OFF
*1
ON
*2
ON
ON
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
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-10
C1046
FL wheel speed sensor control
phase time exceeded
OFF
*1
ON
*2
ON
ON
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
ON
ON
ON
ON
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
ON
ON
ON
ON
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
ON
ON
ON
ON
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
ON
ON
ON
ON
C1073
Faulty motor drive circuit
OFF
ON
*2
ON
ON
C2116
Low or high power supply
voltage in pump motor
OFF
ON
*2
ON
ON
C121D
Abnormality in brake fluid
pressure sensor circuit
OFF
ON
ON
ON
C121E
Abnormality in brake fluid
pressure sensor output signal
OFF
ON
ON
ON
Diagnosis
code No.
Item
Brake
warning
lamp,
brake
warning
display
ABS warning
lamp,
ABS warning
display
ASC warning
lamp,
ASC warning
display
ASC OFF
display
ASC OFF
lamp
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-11
C1000
Abnormality in stop lamp switch
circuit
OFF
OFF
ON
ON
C123B
Prolonged operation of ASC
OFF
OFF
ON
ON
C2200
Abnormality in ASC-ECU
ON
*3
ON
*4
ON
ON
C2101
Abnormality in
battery voltage
(high voltage)
18.0
± 1.0 V or
more
ON
ON
ON
ON
C1395
Brake fluid filling not completed OFF
ABS warning
lamp:
Flashing (1
Hz)
ABS warning
display:
ON
OFF
OFF
C121C
Torque request signal rejection OFF
OFF
ON
ON
C1290
CAN time-out error
OFF
OFF
ON
ON
C2203
Chassis No. not programmed
OFF
ON
OFF
OFF
C2206
Re-execution of variant coding
OFF
ON
ON
ON
C123C
Abnormality in
G & yaw rate
sensor output
value
Abnormality in
lateral G and
yaw rate output
value
OFF
OFF
ON
ON
C2204
Internal abnormality in G & yaw
rate sensor
OFF
OFF
ON
ON
C2111
Brake fluid
pressure
sensor power
supply circuit
Low input
OFF
ON
ON
ON
C2112
Brake fluid
pressure
sensor power
supply circuit
High input
OFF
ON
ON
ON
C2114
*5
Abnormality in
G & yaw rate
sensor
operation
voltage
Low voltage
(6.5
± 0.5 V or
less)
OFF
OFF
ON
ON
C2115
Abnormality in
G & yaw rate
sensor
operation
voltage
High voltage
(18.0
± 1.0 V or
more)
OFF
OFF
ON
ON
Diagnosis
code No.
Item
Brake
warning
lamp,
brake
warning
display
ABS warning
lamp,
ABS warning
display
ASC warning
lamp,
ASC warning
display
ASC OFF
display
ASC OFF
lamp
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-12
C123A
Abnormality in sensor
calibration
OFF
OFF
ON
ON
C1219
Abnormality in steering wheel
sensor signal
OFF
OFF
ON
ON
C121A
Abnormality in
steering wheel
sensor
calibration
Steering wheel
sensor neutral
point not
learned
OFF
ABS warning
lamp:
Flashing (2
Hz)
ABS warning
display:
ON
ON
ON
C2205
Internal abnormality in steering
wheel sensor
OFF
OFF
ON
ON
C2002
Valve calibration error
ON
ON
ON
ON
C2003
Control parameter not
implement
OFF
OFF
ON
ON
C1608
Implausible diagnosis data
OFF
OFF
OFF
OFF
U0001
Bus-off
OFF
OFF
OFF
OFF
U0100
Engine time-out error
OFF
OFF
OFF
OFF
U0101
A/T or CVT time-out error
OFF
OFF
OFF
OFF
U0126
Steering wheel sensor time-out
error
OFF
OFF
OFF
OFF
U0141
ETACS time-out error
OFF
OFF
OFF
OFF
U0125
G & yaw rate sensor message
time-out error/message error
OFF
OFF
ON
ON
U0401
Engine signal malfunction
detected
OFF
OFF
ON
ON
U0404
Abnormality in AS&G signal
OFF
OFF
OFF
OFF
U0428
Steering wheel sensor CRC,
message error
OFF
OFF
ON
ON
U1003
G & yaw rate sensor bus-off
OFF
OFF
ON
ON
U1004
AS&G CAN time-out
OFF
OFF
OFF
OFF
U1415
Variant coding not implemented OFF
ON
ON
ON
U1417
Variant coding value invalid
(includes faulty installation)
OFF
ON
*4
ON
ON
Diagnosis
code No.
Item
Brake
warning
lamp,
brake
warning
display
ABS warning
lamp,
ABS warning
display
ASC warning
lamp,
ASC warning
display
ASC OFF
display
ASC OFF
lamp
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