54A-DIAGNOSTIC FUNCTION

DIAGNOSIS FUNCTION

FCM/LDW/AHB-ECU has the following functions for easier system checks.

DTC set (Refer to ).
Data list output (Refer to ).
Freeze frame data output (Refer to ).

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 name	Data item	Unit
1	Odometer	Total driving distance at the first time a DTC has been set	km (mile)
2	Odometer(Last time fail detect.)	Total driving distance at the last time a DTC has been set	km (mile)
3	Detection counter	Number of set DTCs	Number of counts
4	Ignition cycle	Number of times the electric motor switch is turned "ON" or "LOCK (OFF)" after the past failure transition	Number of counts
5	ECU power supply voltage	Voltage of power supply when the DTC is generated	V
6	ECU temperature	FCM/LDW/AHB-ECU temperature at the time a DTC has been set	°C (°F)
7	Outside temperature	Ambient temperature at the time a DTC has been set	°C (°F)
8	Steering wheel angle	Steering angle of steering wheel sensor when the DTC is generated	deg
9	Accelerator pedal position	Accelerator pedal position when the DTC is generated	%
10	Yaw rate	Yaw rate of G and yaw rate sensor when the DTC is generated	deg/s
11	AS&G status	Not used	-
12	A.S.C. status	ASC control when the DTC is generated: A.S.C. ON/A.S.C. OFF/Not defined/A.S.C. fail	-
13	Master cylinder pressure	Master cylinder pressure of Master cylinder pressure sensor when the DTC is generated	MPa
14	Longitudinal G	Longitudinal G of G and yaw rate sensor when the DTC is generated	m/s²
15	Lateral G	Lateral G of G and yaw rate sensor when the DTC is generated	m/s²
16	Vehicle speed	Vehicle speed when the DTC is generated	km/h (mph)
17	FCM function	FCM function when the DTC is generated: OFF/ON	-
18	Camera/LaserRadar blockage state	Blockage state when the DTC is generated: Normal/Blocked	-
19	FCM auto brake request	FCM auto break when the DTC is generated: OFF/ON	-
20	FCM target deceleration	FCM target deceleration when the DTC is generated	m/s²
21	FCM brake prefill request	FCM brake prefill request when the DTC is generated: OFF/ON	-
22	FCM brake assist request	FCM brake assist request when the DTC is generated: OFF/ON	-
23	FCM engine brake request	FCM engine brake request when the DTC is generated: OFF/ON	-
24	FCM standstill request	FCM standstill request when the DTC is generated: OFF/ON	-
25	LDW function	LDW function when the DTC is generated: "OFF /Fail"/ON/Standby/Warning	-
26	Brake switch	Brake switch when the DTC is generated: OFF/ON	-
27	Ignition/Electric motor switch	Electric motor switch when the DTC is generated: Lock/ACC/ON/Start	-

FAIL-SAFE FUNCTIONS

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 display, the LDW indicator display and the automatic high beam indicator illuminate or flash.

Illumination condition of display in case of failure

DTC No.	Item	Multi information display message	FCM OFF indicator	LDW indicator display screen	Automatic high beam indicator
C1394	INCOMP.learn neutral(SAS)	FCM TEMPORARILY NOT AVAILABLE	ON	ON	ON
C1705	LDW SW circuit low (short)	LDW SERVICE REQUIRED	OFF	OFF	ON
C1707	Implausible coding data	DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE	ON	OFF	ON
C1750	Voltage out of range	DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE	ON	ON	ON
C1751	ECU failure	DRIVER ASSISTANCE CAMERA SERVICE REQUIRED	ON	OFF	OFF
C1752	Radar temperature out of range	DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE	ON	ON	ON
C1753	Radar blockage detected	DRIVER ASSISTANCE CAMERA BLOCKED	ON	ON	ON
C1754	Radar calibration not completed	UNCALIBRATED	Flash (1 Hz)	OFF	OFF
C1777	System fail detected (ASC)	FCM TEMPORARILY NOT AVAILABLE	ON	Normal control^*	ON
C1778	Vehicle speed signal fail	DRIVER ASSISTANCE CAMERA SERVICE REQUIRED	ON	OFF	OFF
C1779	Brake master cylinder PRS.signal	FCM SERVICE REQUIRED	ON	Normal control^*	ON
C1781	SAS fail	FCM SERVICE REQUIRED	ON	OFF	ON
C1782	SAS signal fail	FCM SERVICE REQUIRED	ON	Normal control^*	ON
C1784	FCM switch fixed ON	FCM SERVICE REQUIRED	ON	Normal control^*	ON
C1787	APS signal	FCM SERVICE REQUIRED	ON	Normal control^*	ON
C1788	Longitudinal G sensor signal	FCM SERVICE REQUIRED	ON	Normal control^*	ON
C1791	Vehicle speed signal (invalid)	DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE	ON	ON	ON
C1792	Brake M/C PRS. signal (invalid)	FCM TEMPORARILY NOT AVAILABLE	ON	Normal control^*	ON
C1793	Lateral ACC. signal (invalid)	FCM TEMPORARILY NOT AVAILABLE	ON	ON	ON
C1794	Longitudinal G signal (invalid)	FCM TEMPORARILY NOT AVAILABLE	ON	Normal control^*	ON
C1795	Yawrate signal (invalid)	FCM TEMPORARILY NOT AVAILABLE	ON	ON	ON
C1796	APS signal (invalid)	FCM TEMPORARILY NOT AVAILABLE	ON	Normal control^*	ON
C1798	FCM control disabled (ASC)	FCM SERVICE REQUIRED	ON	Normal control^*	ON
C1809	System temporary not available	DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE	ON	ON	ON
C2256	Brake switch signal fail	FCM SERVICE REQUIRED	ON	Normal control^*	ON
C2271	SAS signal fail	FCM TEMPORARILY NOT AVAILABLE	ON	ON	ON
C2272	Delta SAS signal fail	FCM TEMPORARILY NOT AVAILABLE	ON	Normal control^*	ON
C2276	Brake switch signal	FCM TEMPORARILY NOT AVAILABLE	ON	Normal control^*	ON
C2292	Auto calibration out of range	DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE	ON	ON	ON
C2298	Ambient sensor signal	FCM TEMPORARILY NOT AVAILABLE	ON	Normal control^*	ON
C2299	Implausible coding data	DRIVER ASSISTANCE CAMERA SERVICE REQUIRED	ON	OFF	OFF
U0121	ABS/ASC CAN timeout	DRIVER ASSISTANCE CAMERA SERVICE REQUIRED	ON	OFF	OFF
U0126	SAS CAN timeout	FCM SERVICE REQUIRED	ON	Normal control^*	ON
U0141	ETACS CAN timeout	DRIVER ASSISTANCE CAMERA SERVICE REQUIRED	ON	OFF	ON
U110A	PHEV-ECU CAN timeout	FCM SERVICE REQUIRED	ON	OFF	OFF
U1190	No receive fault detect signal	DRIVER ASSISTANCE CAMERA SERVICE REQUIRED	ON	OFF	OFF
U1195	Coding not completed	DRIVER ASSISTANCE CAMERA TEMPORARILY NOT AVAILABLE	ON	OFF	OFF
-	Bus off	DRIVER ASSISTANCE CAMERA SERVICE REQUIRED	ON	OFF	OFF
-	Calibration is in progress	CALIBRATING	Flash (2 Hz)	Flash (2 Hz)	OFF

note	^*: The LDW indicator display is not associated with the relevant DTC.