17-DIAGNOSTIC FUNCTION

DIAGNOSIS FUNCTION

WARNING DISPLAY

When a malfunction occurs in the ACC system, the figure will be displayed on the information screen of multi-information display.

If the indicator continues to be displayed on the information screen of multi-information display, check the diagnostic trouble code that is set.

HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE)

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long

caution

To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).

1. Ensure that the ignition switch is at the "LOCK" (OFF) position.

2. Start up the personal computer.

3. Connect special tool MB992747/M992748 to special tool MB992744 and the personal computer.

4. Connect special tool MB992745 to special tool MB992744.

5. Connect special tool MB992745 to the data link connector.

note	When the special tool MB992745 is connected to the data link connector, the special tool MB992744 indicator light will be illuminated in a green color.

6. Start the scan tool (M.U.T.-IIISE) system on the personal computer.

note	Disconnecting scan tool (M.U.T.-IIISE) is the reverse of the connecting sequence, making sure that the ignition switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long

note	If the battery voltage is low, diagnostic trouble codes will not be set. Check the battery if scan tool (M.U.T.-IIISE) does not display.

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "STV."

4. Select "ACC/FCM" from "System List," and press the "OK" button.

5. Select "Diagnostic Trouble Code" to read the DTC.

6. If a DTC is set, it is shown.

7. Choose "Erase DTCs" to erase the DTC.

HOW TO READ DATA LIST

Required Special Tools:

MB992744: Vehicle communication interface-Line (V.C.I.-Line)
MB992745: V.C.I.-Line main harness A (for vehicle with CAN communication)
MB992747: V.C.I.-Line USB cable short
MB992748: V.C.I.-Line USB cable long

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "STV".

4. Select "ACC/FCM" from "System List," and press the "OK" button.

5. Select "Data List."

6. Choose an appropriate item and select the "OK" button.

HOW TO DIAGNOSE THE CAN BUS LINES

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "CAN bus diagnosis" from the start-up screen.

4. When the optional equipment screen is displayed, choose the one which the vehicle is fitted with, and then select the "OK" button.

CHECK OF THE FREEZE FRAME DATA

Various data of when the DTC has been set is obtained, and the status of that time is stored. By analyzing each data using scan tool (M.U.T.-IIISE), troubleshooting can be carried out efficiently.

Display items of the freeze frame data are as follows.

DISPLAY ITEM LIST

Item No.	Item	Unit/display contents
1	Odometer	km (mile)
2	Odometer (Last time fail detected)	km (mile)
3	Detection counter	times
4	Ignition cycle	times
5	ECU power supply voltage	V
6	ECU temperature	°C (°F)
7	Steering wheel angle	deg
8	Accelerator pedal position	%
9	Yaw rate	deg/s
10	AS&G status	- (Not used)
11	A.S.C. status	A.S.C. ON, A.S.C. OFF, Not defined, A.S.C. fail
12	Master cylinder pressure	MPa
13	Longitudinal G	m/s²
14	Lateral G	m/s²
15	Vehicle speed	km/h (mph)
16	FCM function	OFF, ON
17	RADAR blockage state	Normal, Blocked
18	FCM auto brake request	OFF, ON
19	FCM target deceleration	m/s²
20	FCM brake prefill request	OFF, ON
21	FCM brake assist request	OFF, ON
22	FCM engine brake request	OFF, ON
23	FCM standstill request	OFF, ON
24	Brake switch	OFF, ON
25	Ignition switch	Lock, ACC, ON, Start
26	ACC set speed (unit)	km/h, mph
27	ACC system status	OFF, Standby, Active, Accel override, Temporary fail, System fail, Auto canceled, -
28	Auto brake status	Not active, ACC Braking, FCM Pre- braking, FCM Braking
29	ACC set speed	-
30	Vertical alignment angle (Current)	deg
31	Horizontal alignment angle (Current)	deg

FAIL-SAFE FUNCTIONS <ACC/FCM-ECU>

When the ACC/FCM-ECU detects any malfunction, it will show a message on the multi-information display and make the ACC indicator and the FCM OFF indicator illuminate or flash.

Illumination condition of display in case of failure

DTC	Item	Multi-information display			FCM OFF indicator
DTC	Item	Message (ACC warning display)	ACC indicator	Message (FCM warning display)	FCM OFF indicator
C1394	INCOMP.learn neutral(SAS)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1707	Implausible coding data	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1747	Shift signal undetermined	-	-	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1750	Voltage out of range	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1751	ECU failure	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
C1752	Radar temperature out of range	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1753	Radar blockage detected	ACC RADAR BLOCKED^*1	ON^*1	FCM RADAR BLOCKED^*2	ON
C1754	Radar calibration not completed	ACC TEMPORARILY NOT AVAILABLE^*1	Flash (1 Hz)^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1768	Radar calibration fail (Left)	ACC TEMPORARILY NOT AVAILABLE^*1	Flash (1 Hz)^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1769	Radar calibration fail (Right)	ACC TEMPORARILY NOT AVAILABLE^*1	Flash (1 Hz)^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1770	Radar calibration fail (Lower)	ACC TEMPORARILY NOT AVAILABLE^*1	Flash (1 Hz)^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1771	Radar calibration fail (Upper)	ACC TEMPORARILY NOT AVAILABLE^*1	Flash (1 Hz)^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1772	Alignment sensor too far (Right)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1773	Alignment sensor too far (Left)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1774	Alignment sensor too far (Lower)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1775	Alignment sensor too far (Upper)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1776	ACC system fail detected (ENG)	ACC SERVICE REQUIRED	OFF	-	-
C1777	System fail detected (ASC)	ACC SERVICE REQUIRED	OFF	-	-
C1778	Vehicle speed signal fail	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
C1779	Brake master cylinder PRS.signal	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
C1780	Acceleration signal fail	ACC SERVICE REQUIRED	OFF	-	-
C1781	SAS fail	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
C1782	SAS signal fail	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
C1783	ACC distance switch fixed ON	ACC SERVICE REQUIRED	OFF	-	-
C1786	System fail detected (T/M)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	-	-
C1787	APS signal	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
C1788	Longitudinal G sensor signal	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
C1791	Vehicle speed signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1792	Brake M/C PRS. signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1793	Lateral ACC. signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1794	Longitudinal G signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1795	Yawrate signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1796	APS signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C1809	System temporary not available	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C2256	Brake switch signal fail	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
C2267	Wheel speed signal fail	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C2268	Distance travelled signal fail	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C2271	SAS signal fail	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C2272	Delta SAS signal fail	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C2276	Brake switch signal	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C2299	Implausible coding data	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE	ON
C2337	Engine RPM signal failure	ACC SERVICE REQUIRED	OFF	-	-
C2338	Engine RPM signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	-	-
C2339	ASC system fail (ASC ECU)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C2340	FCM control disabled (ASC)	-	-	FCM SERVICE REQUIRED	ON
C2341	ACC system status of ASC ECU signal failure	ACC SERVICE REQUIRED	OFF	-	-
C2342	Auto Hold information signal failure	ACC SERVICE REQUIRED	OFF	-	-
C2343	Auto Hold status signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	-	-
C2344	Standstill status signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	-	-
C2345	Accel and Brake override signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	-	-
C2346	Acceleration signal (invalid)	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	-	-
C2347	EPB state signal failure	ACC SERVICE REQUIRED	OFF	-	-
C2348	FCM state from FCM/LDW/AHB ECU signal (invalid)	-	-	FCM TEMPORARILY NOT AVAILABLE^*2	ON
C2349	Received FCM system fail from FCM/LDW/AHB ECU	-	-	-	ON
C2350	Received FCM temporary fail from FCM/LDW/AHB ECU	-	-	-	ON
U0100	Engine CAN timeout	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
U0101	T/M CAN timeout	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
U0121	ABS/ASC CAN timeout	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
U0126	SAS CAN timeout	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
U0141	ETACS CAN timeout	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
U0317	EPB CAN timeout	ACC SERVICE REQUIRED	OFF	-	-
U1190	No receive fault detect signal	ACC SERVICE REQUIRED	OFF	FCM SERVICE REQUIRED	ON
U1195	Coding not completed	ACC TEMPORARILY NOT AVAILABLE^*1	ON^*1	FCM TEMPORARILY NOT AVAILABLE^*2	ON
U15A5	FCM/LDW/AHB CAN timeout	-	-	FCM SERVICE REQUIRED	ON

note	^1: When the ACC system is turned on. ^2: When the FCM system is turned on.