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DIAGNOSIS FUNCTION
FCM/LDW/AHB-ECU has the following functions for easier system checks.
All the above items can be diagnosed using scan tool (M.U.T.-IIISE).
 
 
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using the scan tool (M.U.T.-IIISE).
 
 
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 (M.U.T.-IIISE), the troubleshooting can be performed more efficiently. The displayed items are as the table below.
Display item list
Item No.Item nameData itemUnit
1OdometerTotal driving distance at the first time a DTC has been setkm (mile)
2Odometer(Last time fail detect.)Total driving distance at the last time a DTC has been setkm (mile)
3Detection counterNumber of set DTCsNumber of counts
4Ignition cycleNumber of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transitionNumber of counts
5ECU power supply voltageVoltage of power supply when the DTC is generatedV
6ECU temperatureFCM/LDW/AHB-ECU temperature at the time a DTC has been set°C (°F)
7Outside temperatureAmbient temperature at the time a DTC has been set°C (°F)
8Steering wheel angleSteering angle of steering wheel sensor when the DTC is generateddeg
9Accelerator pedal positionAccelerator pedal position when the DTC is generated%
10Yaw rateYaw rate of G and yaw rate sensor when the DTC is generateddeg/s
11AS&G statusNot used
12A.S.C. statusASC control when the DTC is generated: A.S.C. ON/A.S.C. OFF/Not defined/A.S.C. fail-
13Master cylinder pressureMaster cylinder pressure of Master cylinder pressure sensor when the DTC is generatedMPa
14Longitudinal GLongitudinal G of G and yaw rate sensor when the DTC is generatedm/s2
15Lateral GLateral G of G and yaw rate sensor when the DTC is generatedm/s2
16Vehicle speedVehicle speed when the DTC is generatedkm/h (mph)
17FCM functionFCM function when the DTC is generated: OFF/ON-
18Camera/LaserRadar blockage stateBlockage state when the DTC is generated: Normal/Blocked-
19FCM auto brake requestFCM auto break when the DTC is generated: OFF/ON-
20FCM target decelerationFCM target deceleration when the DTC is generatedm/s2
21FCM brake prefill requestFCM brake prefill request when the DTC is generated: OFF/ON-
22FCM brake assist requestFCM brake assist request when the DTC is generated: OFF/ON-
23FCM engine brake requestFCM engine brake request when the DTC is generated: OFF/ON-
24FCM standstill requestFCM standstill request when the DTC is generated: OFF/ON-
25LDW functionLDW function when the DTC is generated: "OFF /Fail"/ON/Standby/Warning-
26Brake switchBrake switch when the DTC is generated: OFF/ON-
27Ignition switch / Electric motor switchIgnition switch when the DTC is generated: Lock/ACC/ON/Start-
28TSR functionNot used
 
 
FAIL-SAFE FUNCTIONS
<Up to 19 Model year>
<20 Model year>
When the FCM/LDW/AHB-ECU detects any malfunction, it will show a message on the multi-information display and make the FCM OFF indicator, the LDW indicator and the automatic high beam indicator illuminate or flash.
<From 22 Model year>
 
 
Illumination condition of display in case of failure
DTC No.ItemMessage (Multi information display)LDW indicatorFCM OFF indicatorAutomatic high beam indicator
C1394INCOMP.learn neutral(SAS)FCM TEMPORARILY NOT AVAILABLENormal control*ONON
C1705LDW SW circuit low (short)LDW SERVICE REQUIREDOFFOFFON
C1707Implausible coding data<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM TEMPORARILY NOT AVAILABLE
OFFONON
C1747Shift signal undeterminedFCM TEMPORARILY NOT AVAILABLENormal control*ONON
C1750Voltage out of range<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM TEMPORARILY NOT AVAILABLE
ONONON
C1751ECU failure<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA SERVICE REQUIRED
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM SERVICE REQUIRED
OFFONOFF
C1752Radar temperature out of range<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM TEMPORARILY NOT AVAILABLE
ONONON
C1753Radar blockage detectedDRIVER ASSISTANCE CAMERA BLOCKEDONONON
C1754Radar calibration not completedUNCALIBRATEDOFFFlash (1 Hz)OFF
C1777System fail detected (ASC)FCM TEMPORARILY NOT AVAILABLENormal control*ONON
C1778Vehicle speed signal fail<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA SERVICE REQUIRED
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM SERVICE REQUIRED
OFFONOFF
C1779Brake master cylinder PRS.signalFCM SERVICE REQUIREDNormal control*ONON
C1781SAS failFCM SERVICE REQUIREDNormal control*ONON
C1782SAS signal failFCM SERVICE REQUIREDNormal control*ONON
C1784FCM switch fixed ONFCM SERVICE REQUIREDNormal control*ONON
C1787APS signalFCM SERVICE REQUIREDNormal control*ONON
C1788Longitudinal G sensor signalFCM SERVICE REQUIREDNormal control*ONON
C1791Vehicle speed signal (invalid)<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM TEMPORARILY NOT AVAILABLE
ONONON
C1792Brake M/C PRS. signal (invalid)FCM TEMPORARILY NOT AVAILABLENormal control*ONON
C1793Lateral ACC. signal (invalid)FCM TEMPORARILY NOT AVAILABLENormal control*ONON
C1794Longitudinal G signal (invalid)FCM TEMPORARILY NOT AVAILABLENormal control*ONON
C1795Yaw rate signal (invalid)FCM TEMPORARILY NOT AVAILABLENormal control*ONON
C1796APS signal (invalid)FCM TEMPORARILY NOT AVAILABLENormal control*ONON
C1798FCM control disabled (ASC)FCM SERVICE REQUIREDNormal control*ONON
C1809System temporary not available<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM TEMPORARILY NOT AVAILABLE
ONONON
C2256Brake switch signal failFCM SERVICE REQUIREDNormal control*ONON
C2271SAS signal failFCM TEMPORARILY NOT AVAILABLENormal control*ONON
C2272Delta SAS signal failFCM TEMPORARILY NOT AVAILABLENormal control*ONON
C2276Brake switch signalFCM TEMPORARILY NOT AVAILABLENormal control*ONON
C2292Auto calibration out of range<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM TEMPORARILY NOT AVAILABLE
ONONON
C2298Ambient sensor signalFCM TEMPORARILY NOT AVAILABLENormal control*ONON
C2299Implausible coding data<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA SERVICE REQUIRED
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM SERVICE REQUIRED
OFFONOFF
C2351FCM state from ACC/FCM ECU signal (invalid)FCM TEMPORARILY NOT AVAILABLENormal control*ONON
C2352Received FCM system fail from ACC/FCM ECUFCM SERVICE REQUIREDNormal control*ONON
C2353Received FCM temporary fail from ACC/FCM ECUFCM TEMPORARILY NOT AVAILABLENormal control*ONON
C2354FCM mode disagreement detectionFCM SERVICE REQUIREDNormal control*ONON
U0100Engine CAN timeoutFCM SERVICE REQUIREDNormal control*ONON
U0101T/M CAN timeoutFCM SERVICE REQUIREDNormal control*ONON
U0121ABS/ASC CAN timeout<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA SERVICE REQUIRED
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM SERVICE REQUIRED
OFFONOFF
U0126SAS CAN timeoutFCM SERVICE REQUIREDNormal control*ONON
U0141ETACS CAN timeout<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA SERVICE REQUIRED
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM SERVICE REQUIRED
OFFONON
U1190No receive fault detect signal<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA SERVICE REQUIRED
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM SERVICE REQUIRED
OFFONOFF
U1195Coding not completed<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM TEMPORARILY NOT AVAILABLE
OFFONOFF
U15A0ACC/FCM ECU CAN timeoutFCM SERVICE REQUIREDNormal control*ONON
-Bus off<Up to 20 Model year>
DRIVER ASSISTANCE CAMERA SERVICE REQUIRED
<From 22 Model year>
DRIVER ASSISTANCE SYSTEM SERVICE REQUIRED
OFFONOFF
-Calibration is in progressCALIBRATINGFlash (2 Hz)Flash (2 Hz)OFF
note*: The LDW indicator display is not associated with the relevant DTC.