DIAGNOSIS FUNCTION

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

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

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using the M.U.T.-III.

When detecting fault and setting the diagnosis code, the ECU connected to CAN bus line obtains the data before the determination of the diagnosis code and the data when the diagnosis code is determined, and then stores the ECU status of that time. By analysing each data from M.U.T.-III, 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 after the diagnosis code is generated	km
2	Ignition cycle	Number of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transition.	Number of counts is displayed.
4	Accumulated minute	Cumulative time for current malfunction of diagnosis code	min
5	FL ABS control	FL ABS control when the diagnosis code is generated	OFF/ ON
6	FR ABS control	FR ABS control when the diagnosis code is generated	OFF/ ON
7	RL ABS control	RL ABS control when the diagnosis code is generated	OFF/ ON
8	RR ABS control	RR ABS control when the diagnosis code is generated	OFF/ ON
9	EBD control	EBD control when the diagnosis code is generated	OFF/ ON
25	Motor	Motor control when the diagnosis code is generated	OFF/ ON
26	Stop lamp switch	Stop lamp switch condition when the diagnosis code is generated	OFF/ ON
27	Power supply voltage	Voltage of power supply when the diagnosis code is generated	V
33	FL wheel speed sensor	Wheel speed (FL) when the diagnosis code is generated	km/h
34	FR wheel speed sensor	Wheel speed (FR) when the diagnosis code is generated	km/h
35	RL wheel speed sensor	Wheel speed (RL) when the diagnosis code is generated	km/h
36	RR wheel speed sensor	Wheel speed (RR) when the diagnosis code is generated	km/h

FAIL-SAFE FUNCTION

If any malfunction is detected by the self-diagnostic function, ABS-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
C1200	FR wheel speed sensor (signal open circuit)	Extinguished^1 Illuminated^2	Illuminated
C1205	FL wheel speed sensor (signal open circuit)
C1210	RR wheel speed sensor (signal open circuit)
C1215	RL wheel speed sensor (signal open circuit)
C1201	FR wheel speed sensor signal (signal short circuit)	Extinguished^1 Illuminated^2	Illuminated
C1206	FL wheel speed sensor signal (signal short circuit)
C1211	RR wheel speed sensor signal (signal short circuit)
C1216	RL wheel speed sensor signal (signal short circuit)
C1202	FR wheel speed sensor power circuit (malfunction power circuit)	Extinguished^1 Illuminated^2	Illuminated
C1207	FL wheel speed sensor power circuit (malfunction power circuit)
C1212	RR wheel speed sensor power circuit (malfunction power circuit)
C1217	RL wheel speed sensor power circuit (malfunction power circuit)
C1225	Deviation between wheel speed (abnormality in tyre size)	Extinguished	Illuminated
C1226	FR inlet valve	Illuminated	Illuminated
C1231	FR outlet valve
C1236	FL inlet valve
C1241	FL outlet valve
C1246	RR inlet valve
C1251	RR outlet valve
C1256	RL inlet valve
C1261	RL outlet valve
C1266^*3	Motor stuck (motor stick or open circuit)	Illuminated	Illuminated
C1273^*3	Motor drive circuit stuck off (open circuit)	Illuminated	Illuminated
C1274^*3	Motor drive circuit stuck on (short circuit)	Illuminated	Illuminated
C1278	Valve power circuit stuck off (open circuit)	Illuminated	Illuminated
C1279	Valve power circuit stuck on (short circuit)	Illuminated	Illuminated
C1340	Stop lamp switch	Extinguished	Extinguished
C1395	Incompletion brake fluid filling	Flashes (1Hz)	Flashes (1Hz)
C1860	Power supply high voltage	Illuminated	Illuminated
C1861	Power supply low voltage	Illuminated	Illuminated
U1073	Bus-off	Extinguished	Extinguished
U1108	Meter CAN timeout/ Not equipped	Extinguished	Extinguished
U1109	ETACS CAN timeout/ Not equipped	Extinguished	Extinguished
U1195	Coding not completed	Extinguished	Extinguished
U1197	Coding data unavailable	Extinguished	Extinguished

note

^*1: Normality on rear wheels (both right or left).
^*2: Abnormality on rear wheels (both right and left).
^*3: This diagnosis code is not set within the vehicle speed of 10 km/h or less.

Under EBD and ABS control in case of failure

Diagnosis code No.	Item	Countermeasures for failure
		EBD control	ABS control
C1200	FR wheel speed sensor (signal open circuit)	Executed^1 Prohibited^2	Prohibited
C1205	FL wheel speed sensor (signal open circuit)
C1210	RR wheel speed sensor (signal open circuit)
C1215	RL wheel speed sensor (signal open circuit)
C1201	FR wheel speed sensor signal (signal short circuit)	Executed^1 Prohibited^2	Prohibited
C1206	FL wheel speed sensor signal (signal short circuit)
C1211	RR wheel speed sensor signal (signal short circuit)
C1216	RL wheel speed sensor signal (signal short circuit)
C1202	FR wheel speed sensor power circuit (malfunction power circuit)	Executed^1 Prohibited^2	Prohibited
C1207	FL wheel speed sensor power circuit (malfunction power circuit)
C1212	RR wheel speed sensor power circuit (malfunction power circuit)
C1217	RL wheel speed sensor power circuit (malfunction power circuit)
C1225	Deviation between wheel speed (abnormality in tyre size)	Executed	Prohibited
C1226	FR inlet valve	Prohibited	Prohibited
C1231	FR outlet valve
C1236	FL inlet valve
C1241	FL outlet valve
C1246	RR inlet valve
C1251	RR outlet valve
C1256	RL inlet valve
C1261	RL outlet valve
C1266^*3	Motor stuck (motor stick or open circuit)	Prohibited	Prohibited
C1273^*3	Motor drive circuit stuck off (open circuit)	Prohibited	Prohibited
C1274^*3	Motor drive circuit stuck on (short circuit)	Prohibited	Prohibited
C1278	Valve power circuit stuck off (open circuit)	Prohibited	Prohibited
C1279	Valve power circuit stuck on (short circuit)	Prohibited	Prohibited
C1340	Stop lamp switch	Executed	Executed
C1395	Incompletion brake fluid filling	Prohibited	Prohibited
C1860	Power supply high voltage	Prohibited	Prohibited
C1861	Power supply low voltage	Prohibited	Prohibited
U1073	Bus-off	Executed	Executed
U1108	Meter CAN timeout/ Not equipped	Executed	Executed
U1109	ETACS CAN timeout/ Not equipped	Executed	Executed
U1195	Coding not completed	Executed	Executed
U1197	Coding data unavailable	Executed	Executed

note

^*1: Normality on rear wheels (both right or left).
^*2: Abnormality on rear wheels (both right and left).
^*3: This diagnosis code is not set within the vehicle speed of 10 km/h or less.

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