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DIAGNOSTIC FUNCTION
ASC-ECU has the following functions for easier system checks. All the following items can be diagnosed using the scan tool.
 
 
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using the scan tool.
 
 
When detecting fault and storing the DTC, the ECU connected to CAN bus line obtains the data before the determination of the DTC and the data when the DTC is determined, and then stores the ECU status of that time. By analyzing each data from scan tool, the troubleshooting can be performed more efficiently. The displayed items are as the table below.
Display item list
Item No.Item nameContentUnit
1OdometerTotal driving distance after the DTC is generatedmile
2Ignition cycleNumber of times the ignition switch is turned "ON" or "LOCK" (OFF) after the past failure transitionNumber of counts is displayed.
5ABS ControlABS control when the DTC is generated: OFF/ON-
6Brake TCL ControlTraction control (brake control) when the DTC is generated: OFF/ON-
7Engine TCL ControlTraction control (engine control) when the DTC is generated: OFF/ON-
8A.S.C. ControlASC control when the DTC is generated: OFF/ON-
9Brake assist controlBrake assist control when the DTC is generated: OFF/ON-
11Stoplight switchStop light switch condition when the DTC is generated: OFF/ON-
12Pump motorPump motor condition when the DTC is generated: OFF/ON-
13Brake TCL operationTraction control (brake control) operation when the DTC is generated: Permission/Prohibition-
14A.S.C./TCL off switchASC OFF switch condition when the DTC is generated: OFF/ON-
15Steering angle sensorSteering angle of steering wheel sensor when the DTC is generateddeg
16Yaw rate sensorYaw rate of G and yaw rate sensor when the DTC is generateddeg/s
17Lateral G sensorLateral G of G and yaw rate sensor when the DTC is generatedG
18G sensorLongitudinal G of G and yaw rate sensor when the DTC is generatedG
19Master cylinder pressure sensorMaster cylinder pressure of Master cylinder pressure sensor when the DTC is generatedbar
20Power supply voltageVoltage of power supply when the DTC is generatedV
21FR wheel speed sensorWheel speed (FR) when the DTC is generatedmph
22FL wheel speed sensorWheel speed (FL) when the DTC is generatedmph
23RR wheel speed sensorWheel speed (RR) when the DTC is generatedmph
24RL wheel speed sensorWheel speed (RL) when the DTC is generatedmph
 
 
FAIL-SAFE FUNCTIONS
  • ASC-ECU constantly monitors the input and output signals.
  • When a malfunction is determined by the diagnostic function, ASC-ECU illuminates the brake warning light, brake warning display, ABS warning light, ABS warning display, ASC warning light, ASC warning display, and ASC OFF light. At the same time, ASC-ECU prohibits the EBD, ABS, ASC, TCL, brake assist, HSA, ESS and FCM.
    noteThe brake warning light and brake warning display are used as the EBD control warning light.
  • When the brake pad temperature (assumed) exceeds the specified value, the ASC OFF light flashes (2 Hz).
  • Various controls are processed depending on the cause of malfunction as shown below.
 
 
Illumination condition of warning light and display in case of failure
Diagnostic trouble code No.ItemBrake warning light,
brake warning display		ABS warning light,
ABS warning display		ASC warning light,
ASC warning display		ASC OFF light
ASC OFF display
C100AAbnormality in FL wheel speed sensor circuitOFF*1ON *2ONON
C1015Abnormality in FR wheel speed sensor circuit
C1020Abnormality in RL wheel speed sensor circuit
C102BAbnormality in RR wheel speed sensor circuit
C1011Abnormality in FL wheel speed sensor signalOFF*1ON *2ONON
C101CAbnormality in FR wheel speed sensor signal
C1027Abnormality in RL wheel speed sensor signal
C1032Abnormality in RR wheel speed sensor signal
C1014Mutual monitoring of FL wheel speed sensorOFF*1ON *2ONON
C101FMutual monitoring of FR wheel speed sensor
C102AMutual monitoring of RL wheel speed sensor
C1035Mutual monitoring of RR wheel speed sensor
C1041Abnormality in periodical signal for FL wheel speed sensorOFF*1ON *2ONON
C1042Abnormality in periodical signal for FR wheel speed sensor
C1043Abnormality in periodical signal for RL wheel speed sensor
C1044Abnormality in periodical signal for RR wheel speed sensor
C1046FL wheel speed sensor control phase time exceededOFF*1ON *2ONON
C1047FR wheel speed sensor control phase time exceeded
C1048RL wheel speed sensor control phase time exceeded
C1049RR wheel speed sensor control phase time exceeded
C104BAbnormality in FL wheel inlet valve systemONONONON
C104FAbnormality in FR wheel inlet valve system
C1053Abnormality in RL wheel inlet valve system
C1057Abnormality in RR wheel inlet valve system
C105FAbnormality in FL wheel outlet valve systemONONONON
C1063Abnormality in FR wheel outlet valve system
C1067Abnormality in RL wheel outlet valve system
C105BAbnormality in RR wheel outlet valve system
C1200Abnormality in FL/RR wheel cut valve systemONONONON
C1204Abnormality in FR/RL wheel cut valve system
C1208Abnormality in FL/RR wheel suction valve system
C120CAbnormality in FR/RL wheel suction valve system
C2104Faulty valve power supply circuitONONONON
C1073Faulty motor drive circuitOFFON *2ONON
C2116Low or high power supply voltage in pump motorOFFON *2ONON
C121DAbnormality in brake fluid pressure sensor circuitOFFONONON
C121EAbnormality in brake fluid pressure sensor output signalOFFONONON
C1000Abnormality in stoplight switch circuitOFFOFFONON
C123BProlonged operation of ASCOFFOFFONON
C2200Abnormality in ASC-ECUONONONON
C2101Abnormality in battery voltage (high voltage)18.0 ± 1.0 V or moreONONONON
C1395Brake fluid charging incompletionOFF
  • ABS warning light: Flashing (1 Hz)
  • ABS warning display: ON
OFFOFF
C121CTorque request signal rejectionOFFOFFONON
C2206Re-execution of variant codingOFFONONON
C1210*5Longitudinal G sensor input circuitAbnormality in longitudinal G-sensor output voltageOFFONONON
C1242*5Longitudinal G sensor signalAbnormality in longitudinal G-sensor output signalOFFONONON
C123CSensor cluster malfunctionAbnormality in lateral G-sensor and yaw rate output valueOFFOFFONON
C1392Incomplete learn (Longitudinal G)ONONONON
C1393Incomplete learn neutral(Lateral G)ONONONON
C2204Sensor cluster internal errorOFF
  • OFF*4
  • ON*5, 7
ONON
C123AAbnormality in sensor calibrationOFF
  • OFF*4
  • ON*5, 7
ONON
C1219Abnormality in steering wheel sensor signalOFFOFFONON
C121AAbnormality in steering wheel sensor initializationSteering wheel sensor neutral point not learnedOFF
  • ABS warning light: Flashing (2 Hz)
  • ABS warning display: ON
ONON
C2205Internal abnormality in steering wheel sensorOFFOFFONON
C2002Valve calibration errorONONONON
C1608Implausible diagnosis dataOFFOFFOFFOFF
C1707Implausible coding dataOFFON*7OFFON*7
C1800Accele./Decele. monitorOFFOFFONOFF
C1801ACC/FCM Auto Stoplight monitorOFFOFFONOFF
C1805FCM/LDW/AHB malfunctionOFFOFFONOFF
C1807FCM/LDW/AHB target deceleration signalOFFOFFONOFF
U0100Engine time-out errorOFFOFFOFFOFF
U0101CVT time-out errorOFFOFFOFFOFF
U0114*5AWD-ECU time-out errorOFFOFFOFFOFF
U0126Steering wheel sensor time-out errorOFFOFFOFFOFF
U0141ETACS time-out errorOFFOFFONOFF
U0401Engine malfunction detectedOFFOFFONON
U0428Steering wheel sensor CRC, message errorOFFOFFONON
U1015FCM/LDW/AHB Parity/Toggle bit errorOFFOFFONOFF
U1073Bus-offOFFOFFONON
U1195Coding not completedOFFONONON
U1197Coding data unavailableOFFONONON
U15A5FCM/LDW/AHB CAN timeoutOFFOFFONOFF
note
  • *1: Turns on when two or more wheels are faulty.
  • *2: Stays on until the vehicle speed reaches 6 mph (10 km/h) when the ignition switch is turned to ON next time.
  • *3: This diagnostic trouble code is not set with the vehicle speed of 12 mph (20 km/h) or less.
  • *4: FWD.
  • *5: AWD.
  • *6: Does not illuminate when there is no effect to the EBD function.
  • *7: Does not illuminate when there is no effect to the ABS function.
 
 
Under EBD, ABS, ASC, TCL, brake assist, HSA, ESS and FCM in case of failure
Diagnostic trouble code No.ItemEBDABSASCTCLBrake assistHSAESSFCM
C100AFL wheel speed sensor circuitEnabled*1ProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1015FR wheel speed sensor circuit
C1020RL wheel speed sensor circuit
C102BRR wheel speed sensor circuit
C1011FL wheel speed sensor signalEnabled*1ProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C101CFR wheel speed sensor signal
C1027RL wheel speed sensor signal
C1032RR wheel speed sensor signal
C1014FL wheel speed sensor performanceEnabled*1ProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C101FFR wheel speed sensor performance
C102ARL wheel speed sensor performance
C1035RR wheel speed sensor performance
C1041FL wheel speed tone performanceEnabled*1ProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1042FR wheel speed tone performance
C1043RL wheel speed tone performance
C1044RR wheel speed tone performance
C1046FL wheel speed sensor phaseEnabled*1ProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1047FR wheel speed sensor phase
C1048RL wheel speed sensor phase
C1049RR wheel speed sensor phase
C104BFL inlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C104FFR inlet valve
C1053RL inlet valve
C1057RR inlet valve
C105FFL outlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1063FR outlet valve
C1067RL outlet valve
C105BRR outlet valve
C1200FL-RR cut valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1204FR-RL cut valve
C1208FL-RR suction valve
C120CFR-RL suction valve
C2104Valve power supply circuitProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1073Motor drive circuitEnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C2116Pump motor voltage lowEnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C121DBrake fluid pressure sensor circuit (Only the brake assist is defective.)EnabledEnabledEnabledEnabledProhibitedEnabledEnabledEnabled
(Other than above)EnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C121EBrake fluid pressure sensorEnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1000Brake SW (stuck)EnabledEnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C123BSystem control too longEnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
C2200ECU internal errorProhibited*4Prohibited*5ProhibitedProhibitedProhibited*5ProhibitedProhibitedProhibited
C2101Power supply high voltage (18.0 ± 1.0 V or more)ProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1395Incomplete Brake fluid fillingEnabledEnabledEnabledEnabledEnabledEnabledEnabledEnabled
C121CTorque request signal deniedEnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
C2206Re-execution of variant codingEnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1210Longitudinal G sensor input circuit (Abnormality in longitudinal G-sensor output voltage)EnabledEnabled*2, Prohibited*3Enabled*2, Prohibited*3Enabled*2, Prohibited*3Enabled*2, Prohibited*3ProhibitedEnabled*2, Prohibited*3Enabled*2, Prohibited*3
C1242Longitudinal G sensor signal (Abnormality in longitudinal G-sensor output signal)EnabledEnabled*2, Prohibited*3Enabled*2, Prohibited*3Enabled*2, Prohibited*3Enabled*2, Prohibited*3ProhibitedEnabled*2, Prohibited*3Enabled*2, Prohibited*3
C123CSensor cluster malfunction (Abnormality in lateral G-sensor and yaw rate output value)EnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
C1392Incomplete learn (Longitudinal G)EnabledEnabled*2, Prohibited*3Enabled*2, Prohibited*3Enabled*2, Prohibited*3Enabled*2, Prohibited*3ProhibitedEnabled*2, Prohibited*3Enabled*2, Prohibited*3
C1393Incomplete learn neutral(Lateral G)EnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
C2204Sensor cluster internal errorEnabledEnabled*2, Prohibited*3, 6Enabled*2, Prohibited*3Enabled*2, Prohibited*3Enabled*2, Prohibited*3ProhibitedEnabled*2, Prohibited*3Prohibited
C123AAbnormality in sensor calibrationEnabledEnabled*2, Prohibited*3, 6Enabled*2, Prohibited*3Enabled*2, Prohibited*3Enabled*2, Prohibited*3ProhibitedEnabled*2, Prohibited*3Prohibited
C1219Steering angle sensor signalEnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
C121AAbnormality in steering wheel sensor initialization (Steering wheel sensor neutral point not learned)EnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
C2205Internal malfunction of steering wheel sensorEnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
C2002Valve calibration not completedEnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1608Implausible diagnosis dataEnabledEnabledEnabledEnabledEnabledEnabledEnabledEnabled
C1707Implausible coding dataEnabledProhibited*6Prohibited*6Prohibited*6Prohibited*6ProhibitedProhibited*6Prohibited*6
C1800Accele./Decele. monitorEnabledEnabledEnabledEnabledEnabledEnabledEnabledProhibited
C1801ACC/FCM Auto Stoplight monitorEnabledEnabledEnabledEnabledEnabledEnabledEnabledProhibited
C1805FCM/LDW/AHB malfunctionEnabledEnabledEnabledEnabledEnabledEnabledEnabledProhibited
C1807FCM/LDW/AHB target deceleration signalEnabledEnabledEnabledEnabledEnabledEnabledEnabledProhibited
U0100Engine CAN timeoutEnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
U0101T/M CAN timeoutEnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
U0114*3AWD CAN timeoutEnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
U0126SAS CAN timeoutEnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
U0141ETACS CAN timeoutEnabledEnabledProhibited*6Prohibited*6Prohibited*6Prohibited*6Prohibited*6Prohibited*6
U0401Engine (CAN message)EnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
U0428SAS (CAN message)EnabledEnabledProhibitedProhibitedEnabledProhibitedEnabledProhibited
U1015FCM/LDW/AHB Parity/Toggle bit errorEnabledEnabledEnabledEnabledEnabledEnabledEnabledProhibited
U1073Bus-offEnabledEnabledProhibitedProhibitedEnabledProhibitedProhibitedProhibited
U1195Coding not completedEnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
U1197Coding data unavailableEnabledProhibitedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
U15A5FCM/LDW/AHB CAN timeoutEnabledEnabledEnabledEnabledEnabledEnabledEnabledProhibited
note
  • *1: Prohibited when two or more wheels are faulty.
  • *2: FWD.
  • *3: AWD.
  • *4: Not prohibited when the brake warning light is not illuminated.
  • *5: Not prohibited when the ABS warning light is not illuminated.
  • *6: Enabled in some cases.