DIAGNOSIS FUNCTION

TCL/ASC-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 ).

FAIL-SAFE FUNCTION

If any malfunction is detected by the self-diagnostic function, TCL/ASC-ECU illuminates the ABS warning lamp and brake warning lamp^*, and it disables ABS and EBD control.

note

*: The brake warning lamp is used as EBD control warning lamp.

Illumination condition of warning lamp in case of failure

Diagnosis code No.	Item		Countermeasures for failure
			Brake warning lamp	ABS warning lamp	TCL/ASC indicator lamp
C1200	Abnormality in FR wheel speed sensor circuit		Extinguished^*4	Illuminates	Illuminates
C1205	Abnormality in FL wheel speed sensor circuit
C1210	Abnormality in RR wheel speed sensor circuit
C1215	Abnormality in RL wheel speed sensor circuit
C1201^*1	Abnormality in FR wheel speed sensor signal
C1206^*1	Abnormality in FL wheel speed sensor signal
C1211^*1	Abnormality in RR wheel speed sensor signal
C1216^*1	Abnormality in RL wheel speed sensor signal
C1225^*1	Wheel speed sensor system malfunction (abnormality in tyre size)		Illuminates	Illuminates	Illuminates
C1226^*2	Abnormality in FR wheel inlet valve system		Illuminates	Illuminates	Illuminates
C1236^*2	Abnormality in FL wheel inlet valve system
C1246^*2	Abnormality in RR wheel inlet valve system
C1256^*2	Abnormality in RL wheel inlet valve system
C1231^*2	Abnormality in FR wheel outlet valve system		Illuminates	Illuminates	Illuminates
C1241^*2	Abnormality in FL wheel outlet valve system
C1251^*2	Abnormality in RR wheel outlet valve system
C1261^*2	Abnormality in RL wheel outlet valve system
C1266^*2	Abnormality in pump motor (stuck)		Illuminates	Illuminates	Illuminates
C1273^*2	Abnormality in pump motor relay (stuck off)
C1274^*2	Abnormality in pump motor relay (stuck on)
C1276	Abnormality in valve relay system		Illuminates	Illuminates	Illuminates
C1278	Abnormality in valve relay system (stuck off)
C1279	Abnormality in valve relay system (stuck on)		Illuminates	Illuminates	Illuminates
C1300	Abnormality in FR cut valve system		Illuminates	Illuminates	Illuminates
C1305	Abnormality in FR suction valve system
C1310	Abnormality in FL cut valve system
C1315	Abnormality in FL suction valve system
C1340	Abnormality in stop lamp switch		Extinguished	Illuminates	Illuminates
C1345	Abnormality in brake fluid level (low)		Illuminates	Extinguished	Extinguished
C1364	Brake fluid Pressure sensor malfunction		Extinguished	Illuminates	Illuminates
C1366	Lateral G sensor signal malfunction		Extinguished	Extinguished	Illuminates
C1371	Yaw rate sensor signal malfunction		Extinguished	Extinguished	Illuminates
C1385	Yaw rate sensor function decrease		Extinguished	Extinguished	Illuminates
C1387	Lateral G-sensor function decrease		Extinguished	Extinguished	Illuminates
C1388	Yaw rate sensor active check error		Extinguished	Extinguished	Illuminates
C1394	Steering wheel sensor neutral point not learned		Extinguished	Extinguished	Illuminates
C1396	Active stability system control temporarily disabled (Engine torque request rejected)		Extinguished	Extinguished	Illuminates
C1505	Steering wheel sensor malfunction		Extinguished	Extinguished	Illuminates
C1555	Output error in steering wheel sensor		Extinguished	Extinguished	Illuminates
C1607	Abnormality in TCL/ASC-ECU		Extinguished	Illuminates	Illuminates
C1621	Abnormality in G and yaw rate sensor		Extinguished	Illuminates	Illuminates
C1860	Abnormality in battery voltage (high voltage)	16.8 ± 1.0 V or more	Illuminates	Illuminates	Illuminates
C1861^*3	Abnormality in battery voltage (low voltage)	9.6 ± 0.3 V or less	Illuminates	Illuminates	Illuminates
C1862	G and yaw rate sensor power voltage malfunction (high voltage)		Extinguished	Extinguished	Illuminates
C1863	G and yaw rate sensor power voltage malfunction (low voltage)		Extinguished	Extinguished	Illuminates
U1073	Bus off		Extinguished	Illuminates	Illuminates
U1100	Engine-related CAN Timeout error		Extinguished	Extinguished	Illuminates
U1104	Steering wheel sensor CAN Timeout error		Extinguished	Extinguished	Illuminates
U1105	G and yaw rate sensor time-out		Extinguished	Extinguished	Illuminates
U1109	ETACS CAN time-out error		Extinguished	Illuminates	Illuminates
U1406	Accelerator pedal position signal error		Extinguished	Extinguished	Illuminates
U1426	Engine speed signal error		Extinguished	Extinguished	Illuminates
U1427	Engine torque signal error		Extinguished	Extinguished	Illuminates
U1428	Engine’s maximum torque signal error		Extinguished	Extinguished	Illuminates
U1429	Engine’s minimum torque signal error		Extinguished	Extinguished	Illuminates
U1430	Engine torque request signal error		Extinguished	Extinguished	Illuminates

note

^*1: This diagnosis code will not be set when diagnosis code C1860 or C1861 is stored.
^*2: This diagnosis code will not be set when diagnosis code C1278 or C1861 is stored.
^*3: This diagnosis code is not set within the vehicle speed of 6 km/h or less.
^*4: Turns ON when two or more wheels are faulty.

Under EBD and ABS control in case of failure

Diagnosis code No.	Item		Countermeasures for failure
			EBD control	ABS control	TCL/ASC control
C1200	Abnormality in FR wheel speed sensor circuit		Executed (Prohibited when two or more wheels are faulty.)^*4	Prohibited	Prohibited
C1205	Abnormality in FL wheel speed sensor circuit
C1210	Abnormality in RR wheel speed sensor circuit
C1215	Abnormality in RL wheel speed sensor circuit
C1201^*1	Abnormality in FR wheel speed sensor signal
C1206^*1	Abnormality in FL wheel speed sensor signal
C1211^*1	Abnormality in RR wheel speed sensor signal
C1216^*1	Abnormality in RL wheel speed sensor signal
C1225^*1	Wheel speed sensor system malfunction (abnormality in tyre size)		Prohibited	Prohibited	Prohibited
C1226^*2	Abnormality in FR wheel inlet valve system		Prohibited	Prohibited	Prohibited
C1236^*2	Abnormality in FL wheel inlet valve system
C1246^*2	Abnormality in RR wheel inlet valve system
C1256^*2	Abnormality in RL wheel inlet valve system
C1231^*2	Abnormality in FR wheel outlet valve system		Prohibited	Prohibited	Prohibited
C1241^*2	Abnormality in FL wheel outlet valve system
C1251^*2	Abnormality in RR wheel outlet valve system
C1261^*2	Abnormality in RL wheel outlet valve system
C1266^*2	Abnormality in pump motor (stuck)		Prohibited	Prohibited	Prohibited
C1273^*2	Abnormality in pump motor relay (stuck off)
C1274^*2	Abnormality in pump motor relay (stuck on)
C1276	Abnormality in valve relay system		Prohibited	Prohibited	Prohibited
C1278	Abnormality in valve relay system (stuck off)
C1279	Abnormality in valve relay system (stuck on)
C1300	Abnormality in FR cut valve system		Prohibited	Prohibited	Prohibited
C1305	Abnormality in FR suction valve system
C1310	Abnormality in FL cut valve system
C1315	Abnormality in FL suction valve system
C1340	Abnormality in stop lamp switch		Executed	Prohibited	Prohibited
C1345	Abnormality in brake fluid level (low)		Prohibited	Executed	Executed
C1364	Brake fluid Pressure sensor malfunction		Executed	Prohibited	Prohibited
C1366	Lateral G sensor signal malfunction		Executed	Executed	Prohibited
C1371	Yaw rate sensor signal malfunction		Executed	Executed	Prohibited
C1385	Yaw rate sensor function decrease		Executed	Executed	Prohibited
C1387	Lateral G-sensor function decrease		Executed	Executed	Prohibited
C1388	Yaw rate sensor active check error		Executed	Executed	Prohibited
C1394	Steering wheel sensor neutral point not learned		Executed	Executed	Prohibited
C1396	Active stability system control temporarily disabled (Engine torque request rejected)		Executed	Executed	Prohibited
C1505	Steering wheel sensor malfunction		Executed	Executed	Prohibited
C1555	Output error in steering wheel sensor		Executed	Executed	Prohibited
C1607	Abnormality in TCL/ASC-ECU		Executed	Prohibited	Prohibited
C1621	Abnormality in G and yaw rate sensor		Executed	Prohibited	Prohibited
C1860	Abnormality in battery voltage (high voltage)	16.8 ± 1.0 V or more	Prohibited	Prohibited	Prohibited
C1861^*3	Abnormality in battery voltage (low voltage)	9.6 ± 0.3 V or less	Prohibited	Prohibited	Prohibited
C1862	G and yaw rate sensor power voltage malfunction (high voltage)		Executed	Executed	Prohibited
C1863	G and yaw rate sensor power voltage malfunction (low voltage)		Executed	Executed	Prohibited
U1073	Bus off		Executed	Prohibited	Prohibited
U1100	Engine-related CAN Timeout error		Executed	Executed	Prohibited
U1104	Steering wheel sensor CAN Timeout error		Executed	Executed	Prohibited
U1105	G and yaw rate sensor time-out		Executed	Executed	Prohibited
U1109	ETACS CAN time-out error		Executed	Prohibited	Prohibited
U1406	Accelerator pedal position signal error		Executed	Executed	Prohibited
U1426	Engine speed signal error		Executed	Executed	Prohibited
U1427	Engine torque signal error		Executed	Executed	Prohibited
U1428	Engine’s maximum torque signal error		Executed	Executed	Prohibited
U1429	Engine’s minimum torque signal error		Executed	Executed	Prohibited
U1430	Engine torque request signal error		Executed	Executed	Prohibited

note

^*1: This diagnosis code will not be set when diagnosis code C1860 or C1861 is stored.
^*2: This diagnosis code will not be set when diagnosis code C1278 or C1861 is stored.
^*3: This diagnosis code is not set within the vehicle speed of 6 km/h or less.
^*4: Executed when two or more wheels are faulty.

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