DIAGNOSIS FUNCTION

ASTC-ECU has the following functions for easier system checks. The following items can be diagnosed using M.U.T-III.

Diagnosis code set (Refer to ).
Service data output (Refer to ).
Actuator test (Refer to ).

CHECK OF FREEZE FRAME DATA

To detect fault and store the diagnosis code, the ASTC-ECU obtains data before the confirmation of the diagnosis code and data when the diagnosis code is confirmed, and then stores the current condition of the ASTC-ECU. By analysing each data from M.U.T.-III, the troubleshooting can be performed more efficiently. Display items of the freeze frame data are as follows.

Display item list

Item No.	Item name	Data item	Unit
02	Ignition cycle	Number of times the ignition switch is turned "ON" or "LOCK (Extinguished)" after the past failure transition.	Number of counts is displayed.
03	Elapsed time	Total elapsed time after a diagnosis code is generated	min^*
04	Accumulated minute	Cumulative time for current malfunction of diagnosis code	min

note

^*: Total elapsed time can be stored up to 65534 minutes. The display of M.U.T.-III is fixed to 65534 minutes after 65534 minutes have elapsed. Or, if the battery is disconnected, the total elapsed time cannot be measured properly. Thus, 65535 minutes (null value) is displayed. Since the value is calculated according to the information from the ASTC-ECU, a proper value may not be displayed when the ASTC-ECU time-out has occurred.

FAIL-SAFE FUNCTION

If any malfunction is detected by the self-diagnostic function, ASTC-ECU Illuminates the ABS warning lamp, brake warning lamp^*, ASTC indicator lamp and ASTC OFF indicator lamp, and it disables ABS, EBD and ASTC control.

note

*: The brake warning lamp and display are used as EBD control warning lamp.

Illumination condition of warning lamp in case of failure

Diagnosis code No.	Item	ABS warning lamp	Brake warning lamp	ASTC indicator lamp	ASTC OFF indicator lamp
C1200	Wheel speed sensor (FR) (signal open circuit)	Illuminated	Extinguished^1 Illuminated^2	Illuminated	Illuminated
C1205	Wheel speed sensor (FL) (signal open circuit)		Extinguished^1 Illuminated^2
C1210	Wheel speed sensor (RR) (signal open circuit)		Extinguished^3 Illuminated^2
C1215	Wheel speed sensor (RL) (signal open circuit)		Extinguished^3 Illuminated^2
C1201	Wheel speed sensor (FR) (signal short circuit)	Illuminated	Extinguished^1 Illuminated^2	Illuminated	Illuminated
C1206	Wheel speed sensor (FL) (signal short circuit)		Extinguished^1 Illuminated^2
C1211	Wheel speed sensor (RR) (signal short circuit)		Extinguished^3 Illuminated^2
C1216	Wheel speed sensor (RL) (signal short circuit)		Extinguished^3 Illuminated^2
C1202	Wheel speed sensor (FR) (malfunction power circuit)	Illuminated	Extinguished^1 Illuminated^2	Illuminated	Illuminated
C1207	Wheel speed sensor (FL) (malfunction power circuit)		Extinguished^1 Illuminated^2
C1212	Wheel speed sensor (RR) (malfunction power circuit)		Extinguished^3 Illuminated^2
C1217	Wheel speed sensor (RL) (malfunction power circuit)		Extinguished^3 Illuminated^2
C1223	G and yaw rate sensor (active check error)	Illuminated	Extinguished	Illuminated	Illuminated
C1225^*4	Wheel speed sensor malfunction (abnormality in tyre size)	Illuminated	Extinguished	Illuminated	Illuminated
C1226	Control solenoid valve (FR) pressure holding system	Illuminated	Illuminated	Illuminated	Illuminated
C1231	Control solenoid valve (FR) decompressing system
C1236	Control solenoid valve (FL) pressure holding system
C1241	Control solenoid valve (FL) pressure reducing system
C1246	Control solenoid valve (RR) pressure holding system
C1251	Control solenoid valve (RR) pressure reducing system
C1256	Control solenoid valve (RL) pressure holding system
C1261	Control solenoid valve (RL) decompressing system
C1266^*5	Motor system	Illuminated	Illuminated	Illuminated	Illuminated
C1273^*5	Motor relay (stuck off)	Illuminated	Illuminated	Illuminated	Illuminated
C1274	Motor relay (stuck on)	Illuminated	Illuminated	Illuminated	Illuminated
C1278	Solenoid valve relay (open circuit)	Illuminated	Illuminated	Illuminated	Illuminated
C1279	Solenoid valve relay (short circuit)	Illuminated	Illuminated	Illuminated	Illuminated
C1280	Motor fail-safe relay (short circuit)	Illuminated	Illuminated	Illuminated	Illuminated
C1291	Reverse signal (seizure)	Extinguished	Extinguished	Illuminated	Illuminated
C1292	CAN communication error	Extinguished (Illuminated when the G-sensor CAN communication error occurs.)	Extinguished	Illuminated	Illuminated
C1293^{5, 6}	Abnormal rear differential lock detection circuit	Illuminated	Extinguished	Illuminated	Illuminated
C1300	Linear valve (secondly)	Illuminated	Illuminated	Illuminated	Illuminated
C1310	Linear valve (primary)	Illuminated	Illuminated	Illuminated	Illuminated
C1340	Abnormal stop lamp switch circuit	Illuminated	Extinguished	Illuminated	Illuminated
C1361	Abnormal pressure sensor characteristics	Extinguished	Extinguished	Illuminated	Illuminated
C1362	Abnormal pressure sensor (abnormal output value, open or short circuit)	Extinguished	Extinguished	Illuminated	Illuminated
C1364	Pressure sensor malfunction	Extinguished	Extinguished	Illuminated	Illuminated
C1369^*5	G and yaw rate sensor (bank run record error)	Extinguished	Extinguished	Illuminated	Illuminated
C1371	Yaw rate sensor (output error, oscillation error, zero-point error)	Extinguished	Extinguished	Illuminated	Illuminated
C1381^*5	G-sensor (output error, seizure)	Illuminated	Extinguished	Illuminated	Illuminated
C1385	Yaw rate sensor (internal error)	Extinguished	Extinguished	Illuminated	Illuminated
C1386	G-sensor (internal error)	Illuminated	Extinguished	Illuminated	Illuminated
C1388	Yaw rate sensor (active check error)	Extinguished	Extinguished	Illuminated	Illuminated
C1389	G-sensor (active check error)	Illuminated	Extinguished	Illuminated	Illuminated
C1393	G and yaw rate sensor (zero-point not calibrated)	Flashes (Turns Extinguished when the yaw rate sensor learned the neutral point.)	Flashes (Turns Extinguished when the yaw rate sensor learned the neutral point.)	Flashes	Flashes
C1394	Steering wheel sensor neutral point not learned	Flashes	Flashes	Flashes	Flashes
C1395	Brake fluid charging incompletion	Flashes	Flashes	Flashes	Flashes
C1396	Engine-ECU malfunction	Extinguished	Extinguished	Illuminated	Illuminated
C1505	Steering wheel sensor abnormality (detected at ASTC-ECU-side)	Extinguished	Extinguished	Illuminated	Illuminated
C1506	Steering wheel sensor abnormality (self-detection at steering wheel sensor-side)	Extinguished	Extinguished	Illuminated	Illuminated
C1620	Engine-ECU communication error	Extinguished	Extinguished	Illuminated	Illuminated
C1860	High voltage at ASTC-ECU power supply	Illuminated	Illuminated	Illuminated	Illuminated
C1861	Low voltage at ASTC-ECU power supply	Illuminated	Illuminated	Illuminated	Illuminated
U1073	Bus-off	Illuminated	Extinguished	Illuminated	Illuminated
U1100	Engine-ECU timeout error	Extinguished	Extinguished	Illuminated	Illuminated
U1101^*7	A/T-ECU timeout error	Extinguished	Extinguished	Illuminated	Illuminated
U1104	Steering wheel sensor timeout error	Extinguished	Extinguished	Illuminated	Illuminated
U1105	G & yaw rate sensor timeout error	Illuminated	Extinguished	Illuminated	Illuminated
U1109	ETACS-ECU timeout error	Extinguished	Extinguished	Extinguished	Extinguished
U1120	Engine malfunction detected	Extinguished	Extinguished	Illuminated	Illuminated
U1190	ETACS signal receiving error	Extinguished	Extinguished	Extinguished	Extinguished
U1200	Steering wheel sensor communication error	Extinguished	Extinguished	Illuminated	Illuminated
U1201	Yaw rate sensor parity error	Extinguished	Extinguished	Illuminated	Illuminated
U1202	G-sensor parity error	Illuminated	Extinguished	Illuminated	Illuminated
U1204	Steering wheel sensor communication error	Extinguished	Extinguished	Illuminated	Illuminated
U1205	G and yaw rate sensor message counter error	Illuminated	Extinguished	Illuminated	Illuminated

note

^*1: Normality on rear wheels (both right and left)
^*2: Abnormality on rear wheels (both right and left)
^*3: Abnormality on rear wheel (right or left)
^*4: This diagnosis code is not set within the vehicle speed of 30 km/h or less.
^*5: This diagnosis code is not set within the vehicle speed of 10 km/h or less.
^*6: Vehicle with rear differential lock system.
^*7: A/T

System control in case of failure

Diagnosis code No.	Item	ABS	EBD	Active stability control	Active traction control
C1200	Wheel speed sensor (FR) system (open circuit)	Executed	Backup EBD control^1 Prohibited^2	Executed	Executed
C1205	Wheel speed sensor (FL) system (open circuit)		Backup EBD control^1 Prohibited^2
C1210	Wheel speed sensor (RR) system (open circuit)		Backup EBD control^3 Prohibited^2
C1215	Wheel speed sensor (RL) system (open circuit)		Backup EBD control^3 Prohibited^2
C1201	Wheel speed sensor (FR) system (sensor transmitting error)	Executed	Backup EBD control^1 Prohibited^2	Executed	Executed
C1206	Wheel speed sensor (FL) system (sensor transmitting error)		Backup EBD control^1 Prohibited^2
C1211	Wheel speed sensor (RR) system (sensor transmitting error)		Backup EBD control^3 Prohibited^2
C1216	Wheel speed sensor (RL) system (sensor transmitting error)		Backup EBD control^3 Prohibited^2
C1202	Wheel speed sensor (FR) system malfunction (power circuit)	Executed	Backup EBD control^1 Prohibited^2	Executed	Executed
C1207	Wheel speed sensor (FL) system malfunction (power circuit)		Backup EBD control^1 Prohibited^2
C1212	Wheel speed sensor (RR) system malfunction (power circuit)		Backup EBD control^3 Prohibited^2
C1217	Wheel speed sensor (RL) system malfunction (power circuit)		Backup EBD control^3 Prohibited^2
C1223	G and yaw rate sensor (active check error)	Executed	Backup EBD control	Executed	Executed
C1225^*4	Wheel speed sensor malfunction (abnormality in tyre size)	Executed	Backup EBD control	Executed	Executed
C1226	Control solenoid valve (FR) pressure holding system	Executed	Executed	Executed	Executed
C1231	Control solenoid valve (FR) decompressing system
C1236	Control solenoid valve (FL) pressure holding system
C1241	Control solenoid valve (FL) pressure reducing system
C1246	Control solenoid valve (RR) pressure holding system
C1251	Control solenoid valve (RR) pressure reducing system
C1256	Control solenoid valve (RL) pressure holding system
C1261	Control solenoid valve (RL) decompressing system
C1266^*5	Motor system	Executed	Executed	Executed	Executed
C1273^*5	Motor relay (stuck off)	Executed	Executed	Executed	Executed
C1274	Motor relay (stuck on)	Executed	Executed	Executed	Executed
C1278	Solenoid valve relay (open circuit)	Executed	Executed	Executed	Executed
C1279	Solenoid valve relay (short circuit)	Executed	Executed	Executed	Executed
C1280	Motor fail-safe relay (short circuit)	Executed	Executed	Executed	Executed
C1291	Reverse signal (seizure)	Normal control	Normal control	Executed	Executed
C1292	CAN communication error	Normal control	Normal control	Executed	Executed
C1293^{5, 6}	Abnormal rear differential lock detection circuit	Executed	Backup EBD control	Executed	Executed
C1300	Linear valve (secondly)	Executed	Executed	Executed	Executed
C1310	Linear valve (primary)	Executed	Executed	Executed	Executed
C1340	Abnormal stop lamp switch circuit	Executed	Backup EBD control	Executed	Executed
C1361	Abnormal pressure sensor characteristics	Normal control	Normal control	Executed	Executed
C1362	Abnormal pressure sensor (abnormal output value, open or short circuit)	Normal control	Normal control	Executed	Executed
C1364	Pressure sensor malfunction	Normal control	Normal control	Executed	Executed
C1369^*5	G and yaw rate sensor (bank run record error)	Normal control	Normal control	Executed	Normal control
C1371	Yaw rate sensor (output error, oscillation error, zero-point error)	Normal control	Normal control	Executed	Executed
C1381^*5	G-sensor (output error, seizure)	Executed	Backup EBD control	Executed	Executed
C1385	Yaw rate sensor (internal error)	Normal control	Normal control	Executed	Executed
C1386	G-sensor (internal error)	Executed	Backup EBD control	Executed	Executed
C1388	Yaw rate sensor (active check error)	Normal control	Normal control	Executed	Executed
C1389	G-sensor (active check error)	Executed	Backup EBD control	Executed	Executed
C1393	G and yaw rate sensor (zero-point not calibrated)	Normal control	Normal control	Executed	Executed
C1394	Steering wheel sensor neutral point not learned	Normal control	Normal control	Executed	Executed
C1395	Brake fluid charging incompletion	Executed	Executed	Executed	Executed
C1396	Engine-ECU malfunction	Normal control	Normal control	Executed	Executed
C1505	Steering wheel sensor abnormality (detected at ASTC-ECU-side)	Normal control	Normal control	Executed	Executed
C1506	Steering wheel sensor abnormality (self-detection at steering wheel sensor-side)	Normal control	Normal control	Executed	Executed
C1620	Engine-ECU communication error	Normal control	Normal control	Executed	Executed
C1860	High voltage at ASTC-ECU power supply	Executed	Executed	Executed	Executed
C1861	Low voltage at ASTC-ECU power supply	Executed	Executed	Executed	Executed
U1073	Bus-off	Executed	Backup EBD control	Executed	Executed
U1100	Engine-ECU timeout error	Normal control	Normal control	Executed	Executed
U1101^*7	A/T-ECU timeout error	Normal control	Normal control	Executed	Executed
U1104	Steering wheel sensor timeout error	Normal control	Normal control	Executed	Executed
U1105	G and yaw rate sensor timeout error	Executed	Backup EBD control	Executed	Executed
U1109	ETACS-ECU timeout error	Normal control	Normal control	Normal control	Normal control
U1120	Engine malfunction detected	Normal control	Normal control	Executed	Executed
U1190	ETACS signal receiving error	Normal control	Normal control	Normal control	Normal control
U1200	Steering wheel sensor communication error	Normal control	Normal control	Executed	Executed
U1201	Yaw rate sensor parity error	Normal control	Normal control	Executed	Executed
U1202	G-sensor parity error	Executed	Backup EBD control	Executed	Executed
U1204	Steering wheel sensor communication error	Normal control	Normal control	Executed	Executed
U1205	G and yaw rate sensor message counter error	Executed	Backup EBD control	Executed	Executed

note

^*1: Normality on rear wheels (both right and left)
^*2: Abnormality on rear wheels (both right and left)
^*3: Abnormality on rear wheel (right or left)
^*4: This diagnosis code is not set within the vehicle speed of 30 km/h or less.
^*5: This diagnosis code is not set within the vehicle speed of 10 km/h or less.
^*6: Vehicle with rear differential lock system.
^*7: A/T

HOW TO READ DIAGNOSIS CODE

Refer to GROUP 00 - How to Use Troubleshooting and Inspection Service Points

HOW TO ERASE DIAGNOSIS CODE

Refer to GROUP 00 - How to Use Troubleshooting and Inspection Service Points