DIAGNOSTIC FUNCTION


ASC-ECU has the following functions for easier system checks.

All the above items can be diagnosed using M.U.T.-III.

CHECK OF FREEZE FRAME DATA


The freeze frame data can be checked by using the M.U.T.-III.

When detecting fault and storing the diagnosis code, the ECU connected to CAN bus line obtains the data before the determination of the diagnosis code and the data when the diagnosis code is determined, and then stores the ECU status of that time. By analysing each data from M.U.T.-III, the troubleshooting can be performed more efficiently. The displayed items are as the table below.

Display item list
Item No.
Item name
Data item
Unit
1
Odometer
Total driving distance after the diagnosis code is generated
km
2
Ignition cycle
Number of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transition
Number of counts is displayed.
5
Power supply voltage
Voltage of power supply when the diagnosis code is generated
V
8
Lateral G sensor
Lateral G of G and yaw rate sensor when the diagnosis code is generated
G
9
G sensor
Longitudinal G of G and yaw rate sensor when the diagnosis code is generated
G
10
Master cylinder pressure
Master cylinder pressure of Master cylinder pressure sensor when the diagnosis code is generated
bar
11
Steering angle
Steering angle of steering wheel sensor when the diagnosis code is generated
deg
12
Yaw rate sensor
Yaw rate of G and yaw rate sensor when the diagnosis code is generated
deg/s
13
Stop lamp switch
Stop lamp switch condition when the diagnosis code is generated: OFF/ON
-
21
Pump motor
Pump motor condition when the diagnosis code is generated: OFF/ON
-
28
ASC/TCL off switch
ASC OFF switch condition when the diagnosis code is generated: OFF/ON
-
301
ABS control
ABS control when the diagnosis code is generated: OFF/ON
-
302
Brake TCL control
Traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
-
303
Engine TCL control
Traction control operation status (engine control) when the diagnosis code is generated: OFF/ON
-
304
ASC control
ASC control when the diagnosis code is generated: OFF/ON
-
305
Brake TCL operation
Traction control operation status (brake control) status when the diagnosis code is generated: Permission/Prohibition
-
306
Brake assist control
Brake assist control when the diagnosis code is generated: OFF/ON
-
401
FL wheel speed sensor
Wheel speed (FL) when the diagnosis code is generated
km/h
402
FR wheel speed sensor
Wheel speed (FR) when the diagnosis code is generated
km/h
403
RL wheel speed sensor
Wheel speed (RL) when the diagnosis code is generated
km/h
404
RR wheel speed sensor
Wheel speed (RR) when the diagnosis code is generated
km/h

FAIL-SAFE FUNCTIONS <ASC-ECU>




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 lamp
C100A
FL wheel speed sensor circuit
OFF*1
ON
ON
ON
C1015
FR wheel speed sensor circuit
C1020
RL wheel speed sensor circuit
C102B
RR wheel speed sensor circuit
C1011
FL wheel speed sensor signal
OFF*1
ON *2
ON*2
ON*2
C101C
FR wheel speed sensor signal
C1027
RL wheel speed sensor signal
C1032
RR wheel speed sensor signal
C1014
FL wheel speed sensor performance
OFF*1
ON *2
ON*2
ON*2
C101F
FR wheel speed sensor performance
C102A
RL wheel speed sensor performance
C1035
RR wheel speed sensor performance
C1041
FL wheel speed tone performance
OFF*1
ON *2
ON*2
ON*2
C1042
FR wheel speed tone performance
C1043
RL wheel speed tone performance
C1044
RR wheel speed tone performance
C1046
FL wheel speed sensor phase
OFF*1
ON *2
ON*2
ON*2
C1047
FR wheel speed sensor phase
C1048
RL wheel speed sensor phase
C1049
RR wheel speed sensor phase
C104B
FL inlet valve
ON
ON
ON
ON
C104F
FR inlet valve
C1053
RL inlet valve
C1057
RR inlet valve
C105F
FL outlet valve
ON
ON
ON
ON
C1063
FR outlet valve
C1067
RL outlet valve
C105B
RR outlet valve
C1200
FL-RR cut valve
ON
ON
ON
ON
C1204
FR-RL cut valve
C1208
FL-RR suction valve
C120C
FR-RL suction valve
C2104
Valve power supply circuit
ON
ON
ON
ON
C1073
Motor drive circuit
OFF
ON *2
ON*2
ON*2
C2116
Pump motor voltage low
OFF
ON *2
ON*2
ON*2
C121D
Brake fluid pressure sensor circuit
Only the hydraulic brake assist system is defective.
OFF
OFF
ON
OFF
Other than above
OFF
ON
ON
ON
C121E
Brake fluid pressure sensor
OFF
ON
ON
ON
C1000
Brake SW (stuck)
OFF
OFF
ON
ON
C123B
System control too long
OFF
OFF
ON*8
ON*8
C2200
ECU internal error
ON*5
ON*6
ON
ON
C2101
Power supply high voltage
18.0 ± 1.0 V or more
ON
ON
ON
ON
C1395
Incomplete Brake fluid filling
OFF

    ABS warning lamp: Flashing (2 Hz)
    ABS warning display: ON

OFF
OFF
C121C
Torque request signal rejection
OFF
OFF
ON
ON
C2206
Re-execution of variant coding
OFF
ON
ON
ON
C1210
Longitudinal G sensor input circuit
Abnormality in longitudinal G-sensor output voltage
OFF
OFF*3, ON*4
ON
OFF*3, ON*4
C1242
Longitudinal G sensor signal
Abnormality in longitudinal G-sensor output signal
OFF
OFF*3, ON*2*4
ON*2
OFF*3, ON*2*4
C123C
Sensor cluster malfunction
Abnormality in lateral G & yaw rate output value
OFF
OFF
ON*8
ON*8
C1392
Incomplete learn (Longitudinal G)
ON
ON
ON
ON
C1393
Incomplete learn neutral(Lateral G)
ON
ON
ON
ON
C2204
Sensor cluster internal error
OFF

    OFF*3
    ON*4, 6

ON*8
ON*8
C1219
Steering angle sensor signal
OFF
OFF
ON*8
ON*8
C121A
SAS initialization
Steering wheel sensor neutral point not learned
ON
ON
ON
ON
C2205
SAS internal error
OFF
OFF
ON
ON
C2002
Valve calibration not completed
OFF
ON
ON
ON
C1608
EEPROM fail
OFF
OFF
OFF
OFF
C1707
Implausible coding data
OFF
ON*7
ON
ON*7
C1800*9
ACC Acceleration/Deceleration monitor
OFF
OFF
ON
OFF
C1801*9
ACC/FCM Auto Stop lamp monitor
OFF
OFF
ON
OFF
C1802*9
ACC/FCM ECU fail
OFF
OFF
ON
OFF
C1803*9
ACC mode off disagreement
OFF
OFF
ON
OFF
C1804*9
ACC deactivation disagreement
OFF
OFF
ON
OFF
U0100
Engine CAN timeout
OFF
OFF
ON
ON
U0101
T/M CAN timeout
OFF
OFF
ON
ON
U0114*4
4WD CAN timeout
OFF
OFF
ON
ON
U0126
SAS CAN timeout
OFF
OFF
ON
ON
U0141
ETACS CAN timeout
OFF
OFF
ON *7
ON
U0401
Engine (CAN message)
OFF
OFF
ON
ON
U0404*10
AS&G (CAN message)
OFF
OFF
OFF
OFF
U0428
SAS (CAN message)
OFF
OFF
ON
ON
U1004*10
AS&G CAN timeout
OFF
OFF
OFF
OFF
U1011*9
ACC/FCM CAN signal error
OFF
OFF
ON
OFF
U1013*9
Driver demand torque signal
OFF
OFF
ON
OFF
U1073
Bus-off
OFF
OFF
ON
ON
U1195
Coding not completed
OFF
ON
ON
ON
U1197
Coding data unavailable
OFF
ON
ON
ON
U15A0*9
ACC/FCM ECU CAN timeout
OFF
OFF
ON
OFF
note
  • *1: Turns on when two or more wheels are faulty.
  • *2: Stays on until the vehicle speed reaches 10 km/h when the ignition switch is turned to ON next time.
  • *3: 2WD.
  • *4: 4WD.
  • *5: Does not illuminate when there is no effect to the EBD function.
  • *6: Does not illuminate when there is no effect to the ABS function.
  • *7: May not illuminate in some trouble causes.
  • *8: Stays on until the vehicle speed 20 km/h or higher and turn left or right when the ignition switch is turned to on next time.
  • *9: Vehicles with ACC/FCM.
  • *10: Vehicles with AS&G.

Under EBD, ABS, ASC, TCL, brake assist, HSA, ESS, ACC/FCM in case of failure


Diagnosis code No.
Item
EBD
ABS
ASC
TCL
Brake assist
HSA
ESS
ACC/FCM
C100A
FL wheel speed sensor circuit
Enabled*1
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1015
FR wheel speed sensor circuit
C1020
RL wheel speed sensor circuit
C102B
RR wheel speed sensor circuit
C1011
FL wheel speed sensor signal
Enabled*1
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C101C
FR wheel speed sensor signal
C1027
RL wheel speed sensor signal
C1032
RR wheel speed sensor signal
C1014
FL wheel speed sensor performance
Enabled*1
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C101F
FR wheel speed sensor performance
C102A
RL wheel speed sensor performance
C1035
RR wheel speed sensor performance
C1041
FL wheel speed tone performance
Enabled*1
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1042
FR wheel speed tone performance
C1043
RL wheel speed tone performance
C1044
RR wheel speed tone performance
C1046
FL wheel speed sensor phase
Enabled*1
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1047
FR wheel speed sensor phase
C1048
RL wheel speed sensor phase
C1049
RR wheel speed sensor phase
C104B
FL inlet valve
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C104F
FR inlet valve
C1053
RL inlet valve
C1057
RR inlet valve
C105F
FL outlet valve
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1063
FR outlet valve
C1067
RL outlet valve
C105B
RR outlet valve
C1200
FL-RR cut valve
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1204
FR-RL cut valve
C1208
FL-RR suction valve
C120C
FR-RL suction valve
C2104
Valve power supply circuit
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1073
Motor drive circuit
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C2116
Pump motor voltage low
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C121D
Brake fluid pressure sensor circuit
Only the brake assist is defective.
Enabled
Enabled
Enabled
Enabled
Prohibited
Enabled
Enabled
Enabled
Other than above
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C121E
Brake fluid pressure sensor
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1000
Brake SW (stuck)
Enabled
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C123B
System control too long
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
C2200
ECU internal error
Prohibited*4
Prohibited*5
Prohibited
Prohibited
Prohibited*5
Prohibited
Prohibited
Prohibited
C2101
Power supply high voltage
18.0 ± 1.0 V or more
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1395
Incomplete Brake fluid filling
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
C121C
Torque request signal denied
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
C2206
Re-execution of variant coding
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1210
Longitudinal G sensor input circuit
Abnormality in longitudinal G-sensor output voltage
Enabled
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Prohibited
Prohibited*3
Prohibited*3
C1242
Longitudinal G sensor signal
Abnormality in longitudinal G-sensor output signal
Enabled
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Prohibited
Prohibited*3
Prohibited*3
C123C
Sensor cluster malfunction
Abnormality in lateral G & yaw rate output value
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
C1392
Incomplete learn (Longitudinal G)
Enabled
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Prohibited
Prohibited*3
Prohibited*3
C1393
Incomplete learn neutral(Lateral G)
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
C2204
Sensor cluster internal error
Enabled
Enabled*2, Prohibited*3, 6
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Enabled*2, Prohibited*3
Prohibited
Enabled*2, Prohibited*3
Prohibited
C1219
Steering angle sensor signal
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
C121A
SAS initialization
Steering wheel sensor neutral point not learned
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
C2205
SAS internal error
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
C2002
Valve calibration not completed
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1608
EEPROM fail
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
C1707
Implausible coding data
Enabled
Prohibited*6
Prohibited*6
Prohibited*6
Prohibited*6
Prohibited
Prohibited*6
Prohibited*6
C1800*7
ACC Acceleration/Deceleration monitor
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
C1801*7
ACC/FCM Auto Stop lamp monitor
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
C1802*7
ACC/FCM ECU fail
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
C1803*7
ACC mode off disagreement
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
C1804*7
ACC deactivation disagreement
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
U0100
Engine CAN timeout
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
U0101
T/M CAN timeout
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
U0114*3
4WD CAN timeout
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
U0126
SAS CAN timeout
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
U0141
ETACS CAN timeout
Enabled
Enabled
Prohibited*6
Prohibited*6
Prohibited*6
Prohibited*6
Prohibited*6
Prohibited*6
U0401
Engine (CAN message)
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
U0404*8
AS&G (CAN message)
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
U0428
SAS (CAN message)
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
U1073
Bus-off
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Prohibited
Prohibited
U1004*8
AS&G CAN timeout
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
U1011*7
ACC/FCM CAN signal error
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
U1013*7
Driver demand torque signal
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
U1195
Coding not completed
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
U1197
Coding data unavailable
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
U15A0*7
ACC/FCM ECU CAN timeout
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
note
  • *1: Prohibited when two or more wheels are faulty.
  • *2: 2WD.
  • *3: 4WD.
  • *4: Not prohibited when the brake warning lamp is not illuminated.
  • *5: Not prohibited when the ABS warning lamp is not illuminated.
  • *6: Enabled in some cases.
  • *7: Vehicles with ACC/FCM.
  • *8: Vehicles with AS&G.

FAIL-SAFE FUNCTIONS <ACC/FCM-ECU (Related to the FCM)>


If the ACC/FCM-ECU determines that the FCM is defective by means of its self-diagnosis, the FCM failure display or the FCM temporary failure display will illuminate.

Illumination condition of display in case of failure


Diagnosis code No.
Item
FCM failure display
FCM temporary failure display
C1394
Incompleted learn neutral (Steering wheel sensor)
ON
OFF
C1707
Implausible coding data
ON
OFF
C1750
ACC/FCM-ECU voltage out of range
OFF
ON
C1751
ACC/FCM-ECU failure
ON
OFF
C1752
ACC/FCM radar temperature out of range
OFF
ON
C1753
ACC/FCM radar blockage detected
OFF
ON
C1754
ACC/FCM radar calibration not completed
OFF
ON
C1768
Alignment left compensation
ON
OFF
C1769
Alignment right compensation
ON
OFF
C1770
Reflector plate in the lowermost
ON
OFF
C1771
Reflector plate in the uppermost
ON
OFF
C1772
Alignment sensor too far right
ON
OFF
C1773
Alignment sensor too far left
ON
OFF
C1774
Alignment sensor too low
ON
OFF
C1775
Alignment sensor too high
ON
OFF
C1777
Received ACC failure from ASC-ECU
ON
OFF
C1778
Vehicle speed signal failure
ON
OFF
C1779
Brake master pressure signal failure
ON
OFF
C1781
SAS failure
ON
OFF
C1782
SAS signal failure
ON
OFF
C1784
FCM switch fixed ON
ON
OFF
C1785
Fault detection signal failure
ON
OFF
U0100
Engine CAN timeout
ON
OFF
U0101
T/M CAN timeout
ON
OFF
U0121
ABS/ASC CAN timeout
ON
OFF
U0126
SAS CAN timeout
ON
OFF
U0141
ETACS CAN timeout
ON
OFF
U1195
Coding not completed
ON
OFF