DIAGNOSTIC FUNCTION


ABS-ECU has the following functions for easier system checks.

All the above items can be diagnosed using M.U.T.-III.

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 wheel ABS control
 FL wheel ABS control when the diagnosis code is generated: OFF/ON
 -
6
 FR wheel ABS control
 FR wheel ABS control when the diagnosis code is generated: OFF/ON
 -
7
 RL wheel ABS control
 RL wheel ABS control when the diagnosis code is generated: OFF/ON
 -
8
 RR wheel ABS control
 RR wheel ABS control when the diagnosis code is generated: OFF/ON
 -
9
 EBD control
 EBD control when the diagnosis code is generated: OFF/ON
 -
10
 Rear diff lock switch
 Rear differential lock detection switch condition when the diagnosis code is generated: OFF/ON
 -
11
 Motor
 Pump motor when the diagnosis code is generated: OFF/ON
 -
12
 Stop lamp switch
 Stop lamp switch condition when the diagnosis code is generated: OFF/ON
 -
13
 Power supply voltage
 Voltage of power supply when the diagnosis code is generated
 V
14
 FL wheel speed sensor
 Wheel speed (FL) when the diagnosis code is generated
 km/h
15
 FR wheel speed sensor
 Wheel speed (FR) when the diagnosis code is generated
 km/h
16
 RL wheel speed sensor
 Wheel speed (RL) when the diagnosis code is generated
 km/h
17
 RR wheel speed sensor
 Wheel speed (RR) when the diagnosis code is generated
 km/h

FAIL-SAFE FUNCTIONS


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.
 Inspection item
 ABS warning lamp
 Brake warning lamp
C1200
 FR wheel speed sensor (signal open circuit)
 ON
 OFF/ON*3
C1205
 FL wheel speed sensor (signal open circuit)
C1210
 RR wheel speed sensor (signal open circuit)
C1215
 RL wheel speed sensor (signal open circuit)
C1202
 FR wheel speed sensor power circuit (malfunction power circuit)
 ON
 OFF/ON*3
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)
C101C
 FR wheel speed sensor signal
 ON
 OFF/ON*3
C1011
 FL wheel speed sensor signal
C1032
 RR wheel speed sensor signal
C1027
 RL wheel speed sensor signal
C101F
 FR wheel speed sensor performance
C1014
 FL wheel speed sensor performance
C1035
 RR wheel speed sensor performance
C102A
 RL wheel speed sensor performance
C1041
 FL wheel speed tone performance
 ON
 OFF/ON*3
C1042
 FR wheel speed tone performance
C1043
 RL wheel speed tone performance
C1044
 RR wheel speed tone performance
C1046
 FL wheel speed sensor phase
 ON
 OFF/ON*3
C1047
 FR wheel speed sensor phase
C1048
 RL wheel speed sensor phase
C1049
 RR wheel speed sensor phase
C1225*1
 Wheel Speed Sensor Malfunction (Abnormality in tyre size)
 ON
 OFF
C1226
 Control solenoid valve (FR) pressure holding system
 ON
 ON
C1236
 Control solenoid valve (FL) pressure holding system
C1246
 Control solenoid valve (RR) pressure holding system
C1256
 Control solenoid valve (RL) pressure holding system
C1231
 Control solenoid valve (FR) decompressing system
C1241
 Control solenoid valve (FL) decompressing system
C1251
 Control solenoid valve (RR) decompressing system
C1261
 Control solenoid valve (RL) decompressing system
C1278
 Solenoid valve relay (open circuit)
 ON
 ON
C1279
 Solenoid valve relay (short circuit)
C1266
 Motor stuck
 ON
 ON
C1273*2
 Motor drive circuit stuck off
C1274
 Motor drive circuit stuck on
 ON
 ON
C1381*4
 G sensor (output error, seizure)
 ON
 OFF
C1382*4
 G sensor stuck on
 ON
 OFF
C1395
 Brake fluid charging incompletion
 Flash (1 Hz)
 Flash (1 Hz)
C1860
 High voltage at ABS-ECU power supply
 ON
 ON
C1861
 Low voltage at ABS-ECU power supply
 ON
 ON
C1340
 Abnormal stop lamp switch circuit
 ON
 OFF
C1707
 Implausible coding data
 OFF
OFF
C2206
 Re-execution of variant coding
 OFF
OFF
U1073
 Bus-off
 ON
 OFF
U1108
 Meter CAN timeout
 OFF
OFF
U1109
 ETACS-ECU CAN timeout
 ON
 OFF
U1195
 Coding not completed
 ON
 OFF
note
  • *1: This diagnosis code is not set within the vehicle speed of 30 km/h or less.
  • *2: This diagnosis code is not set within the vehicle speed of 6 km/h or less.
  • *3: This system detects malfunction on both rear wheels.
  • *4: Vehicles with 4WD.

Under EBD, ABS in case of failure


Diagnosis code No.
 Inspection item
 ABS
 EBD
C1200
 FR wheel speed sensor (signal open circuit)
 Prohibited
 Enabled*1
C1205
 FL wheel speed sensor (signal open circuit)
C1210
 RR wheel speed sensor (signal open circuit)
C1215
 RL wheel speed sensor (signal open circuit)
C1202
 FR wheel speed sensor power circuit (malfunction power circuit)
 Prohibited
 Enabled*1
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)
C101C
 FR wheel speed sensor signal
 Prohibited
 Enabled*1
C1011
 FL wheel speed sensor signal
C1032
 RR wheel speed sensor signal
C1027
 RL wheel speed sensor signal
C101F
 FR wheel speed sensor performance
 Prohibited
 Enabled*1
C1014
 FL wheel speed sensor performance
C1035
 RR wheel speed sensor performance
C102A
 RL wheel speed sensor performance
C1041
 FL wheel speed tone performance
 Prohibited
 Enabled*1
C1042
 FR wheel speed tone performance
C1043
 RL wheel speed tone performance
C1044
 RR wheel speed tone performance
C1046
 FL wheel speed sensor phase
 Prohibited
 Enabled*1
C1047
 FR wheel speed sensor phase
C1048
 RL wheel speed sensor phase
C1049
 RR wheel speed sensor phase
C1225*4
 Wheel Speed Sensor Malfunction (Abnormality in tyre size)
 Prohibited
 Enabled
C1226
 Control solenoid valve (FR) pressure holding system
 Prohibited
 Prohibited
C1236
 Control solenoid valve (FL) pressure holding system
C1246
 Control solenoid valve (RR) pressure holding system
C1256
 Control solenoid valve (RL) pressure holding system
C1231
 Control solenoid valve (FR) decompressing system
C1241
 Control solenoid valve (FL) decompressing system
C1251
 Control solenoid valve (RR) decompressing system
C1261
 Control solenoid valve (RL) decompressing system
C1278
 Solenoid valve relay (open circuit)
 Prohibited
 Prohibited
C1279
 Solenoid valve relay (short circuit)
 Prohibited
 Prohibited
C1266*3
 Motor stuck
 Prohibited
 Prohibited
C1273*3
 Motor drive circuit stuck off
 Prohibited
 Prohibited
C1274
 Motor drive circuit stuck on
 Prohibited
 Prohibited
C1381*2
 G sensor (output error, seizure)
 Prohibited
 Enabled
C1382*2
 G sensor stuck on
 Prohibited
 Enabled
C1395
 Brake fluid charging incompletion
 Prohibited
 Prohibited
C1860
 High voltage at ABS-ECU power supply
 Prohibited
 Prohibited
C1861
 Low voltage at ABS-ECU power supply
 Prohibited
 Prohibited
C1340
 Abnormal stop lamp switch circuit
 Prohibited
 Prohibited
C1707
 Implausible coding data
 Enabled
 Enabled
C2206
 Re-execution of variant coding
 Enabled
 Enabled
U1073
 Bus-off
 Prohibited
 Enabled
U1108
 Meter CAN timeout
 Enabled
 Enabled
U1109
 ETACS-ECU CAN timeout
 Prohibited
 Enabled
U1195
 Coding not completed
 Enabled
 Enabled
note
  • *1: Disables when the system is defective on both rear wheels
  • *2: Vehicles with 4WD.
  • *3: This diagnosis code is not set within the vehicle speed of 6 km/h or less
  • *4: This diagnosis code is not set within the vehicle speed of 30 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 .