DIAGNOSTIC FUNCTION


ASTC-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
 Brake assist control
 Brake assist control when the diagnosis code is generated: OFF/ON
 -
11
 Engine TCL control
 Engine control when the diagnosis code is generated: OFF/ON
 -
12
 Engine A.S.C. control
 Engine control when the diagnosis code is generated: OFF/ON
 -
13
 FL wheel TCL brake control
 FL wheel traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
 -
14
 FR wheel TCL brake control
 FR wheel traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
 -
15
 RL wheel TCL brake control
 RL wheel traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
 -
16
 RR wheel TCL brake control
 RR wheel traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
 -
17
 FL wheel A.S.C. brake control
 FL wheel ASC control when the diagnosis code is generated: OFF/ON
 -
18
 FR wheel A.S.C. brake control
 FR wheel ASC control when the diagnosis code is generated: OFF/ON
 -
19
 RL wheel A.S.C. brake control
 RL wheel ASC control when the diagnosis code is generated: OFF/ON
 -
20
 RR wheel A.S.C. brake control
 RR wheel ASC control when the diagnosis code is generated: OFF/ON
 -
21
 A.S.C. off switch
 ASTC OFF switch condition when the diagnosis code is generated: OFF/ON
 -
22
 Solenoid temperature malfunction
 Solenoid temperature condition when the diagnosis code is generated: OFF/ON
 -
23
 Pad temperature malfunction
 Pad temperature condition when the diagnosis code is generated: OFF/ON
 -
24
 Parking brake switch
 Parking brake switch condition when the diagnosis code is generated: OFF/ON
 -
25
 Rear diff lock switch
 Rear differential lock detection switch condition when the diagnosis code is generated: OFF/ON
 -
26
 Pump motor
 Pump motor condition when the diagnosis code is generated: OFF/ON
 -
27
 Stop lamp switch
 Stop lamp switch condition when the diagnosis code is generated: OFF/ON
 -
28
 Power supply voltage
 Voltage of power supply when the diagnosis code is generated
 V
29
 Longitudinal G sensor
 Longitudinal G of G and yaw rate sensor when the diagnosis code is generated
 G
30
 Lateral G sensor
 Lateral G of G and yaw rate sensor when the diagnosis code is generated
 G
31
 Steering angle
 Steering angle of steering wheel sensor when the diagnosis code is generated
 deg
32
 Yaw rate sensor
 Yaw rate of G and yaw rate sensor when the diagnosis code is generated
 deg/s
33
 Master cylinder pressure
 Master cylinder pressure of Master cylinder pressure sensor when the diagnosis code is generated
 MPa
34
 FL wheel speed sensor
 Wheel speed (FL) when the diagnosis code is generated
 km/h
35
 FR wheel speed sensor
 Wheel speed (FR) when the diagnosis code is generated
 km/h
36
 RL wheel speed sensor
 Wheel speed (RL) when the diagnosis code is generated
 km/h
37
 RR wheel speed sensor
 Wheel speed (RR) when the diagnosis code is generated
 km/h
38
 Engine speed
 Engine speed when the diagnosis code is generated
 r/min

FAIL-SAFE FUNCTIONS



Illumination condition of warning lamp and indicator lamp in case of failure



ASTC-ECU
Diagnosis code No.
 Inspection item
 ABS warning lamp
 Brake warning lamp
 ASTC OFF indicator lamp
 ASTC indicator lamp
C1200
 FR wheel speed sensor (signal open circuit)
 ON
 OFF/ON*1
 ON
 ON
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*1
 ON
 ON
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*1
 ON
 ON
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*1
 ON
 ON
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*1
 ON
 ON
C1047
 FR wheel speed sensor phase
C1048
 RL wheel speed sensor phase
C1049
 RR wheel speed sensor phase
C1225*5
 Wheel Speed Sensor Malfunction (Abnormality in tyre size)
 ON
 OFF
ON
 ON
C1226
 Control solenoid valve (FR) pressure holding system
 ON
 ON
 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) pressure decompressing system
C1251
 Control solenoid valve (RR) pressure decompressing system
C1261
 Control solenoid valve (RL) decompressing system
C1300
 Linear valve (secondly)
C1310
 Linear valve (primary)
C1278
 Solenoid valve relay (open circuit)
 ON
 ON
 ON
 ON
C1279
 Solenoid valve relay (short circuit)
C1266
 Motor stuck
 ON
 ON
 ON
 ON
C1271
 Motor drive circuit malfunction
C1273
 Motor drive circuit stuck off
C1281
 Motor fail-safe relay stuck off
C1291*6
 Reverse signal (seizure)
 OFF
OFF
OFF
ON
C1294*7
 Rear differential lock system malfunction
 OFF
OFF
ON
 ON
C1295*3
 Transfer system malfunction
C1366
 Lateral G sensor (output error)
 OFF
OFF
ON
 ON
C1369*9
 G and yaw rate sensor (bank run record)
C1371
 Yaw rate sensor (output error, oscillation error, zero-point error)
C1377
 G and yaw rate sensor error
 OFF*2/ON*3,*4
 OFF
ON
 ON
C1381
 G sensor (output error, seizure)
 OFF*2/ON*3,*4
 OFF
ON
 ON
C1385
 Yaw rate sensor (internal error)
 OFF
OFF
ON
 ON
C1386
 G sensor (internal error)
C1864
 G and yaw rate sensor power circuit
 OFF*2/ON*3
 OFF
ON
 ON
C1392
 G sensor (zero-point not calibrated)
 Flash (1 Hz)
 Flash (1 Hz)
 Flash (1 Hz)
 Flash (1 Hz)
C1393
 Yaw rate sensor (zero-point not calibrated)
C1394
 Steering wheel sensor (zero-point not calibrated)
C1395
 Brake fluid charging incompletion
C1396
 Engine torque input refusal
 OFF
OFF
ON
 ON
C1860
 High voltage at ASTC-ECU power supply
 ON
 ON
 ON
 ON
C1861
 Low voltage at ASTC-ECU power supply
 ON
 ON
 ON
 ON
C1340
 Abnormal stop lamp switch circuit
 ON
 OFF
ON
 ON
C1346
 Stop lamp drive relay circuit malfunction
 OFF
OFF
ON
 ON
C121D
 Master cylinder pressure sensor malfunction
 OFF
OFF
ON
 ON
C1361
 Abnormal master cylinder pressure sensor characteristics
C1505
 Steering wheel sensor (signal seizure or abnormal neutral point)
 OFF
OFF
ON
 ON
C1506
 Steering wheel sensor (steering wheel sensor malfunction)
C1707
 Implausible coding data
 ON*4
 OFF
ON*4
 ON*4
C2206
 Re-execution of variant coding
 ON*4
 OFF
ON*4
 ON*4
U0401
 Engine (CAN message)
 OFF
OFF
ON
 ON
U0402*8
 T/M (CAN message)
 OFF
OFF
ON
 ON
U0428
 SAS (CAN message)
 OFF
OFF
ON
 ON
U1073
 Bus-off
 ON
 OFF
ON
 ON
U1104
 Steering wheel sensor CAN timeout
 OFF
OFF
ON
 ON
U1100
 Engine-ECU CAN timeout
 OFF
OFF
ON
 ON
U1101*8
 A/T-ECU CAN timeout
 OFF
OFF
ON
 ON
U1108
 Meter CAN timeout
 OFF
OFF
OFF
ON
U1109
 ETACS-ECU CAN timeout
 ON
 OFF
ON
 ON
U1118*3
 Transfer-ECU CAN timeout
 ON
 OFF
ON
 ON
U1195
 Coding not completed
 ON
 OFF
ON*4
 ON*4
U1197
 Coding data unavailable
 ON
 OFF
ON
 ON
U1211
 ENG Parity/Toggle bit error
OFF
OFF
ON
 ON
U1406
 Accelerator pedal position sensor dynamic range error
 OFF
OFF
ON
 ON
U1419
 SAS dynamic range error
 OFF
OFF
ON
 ON
note
  • *1: The system detects malfunction on both rear wheels
  • *2: Vehicles with 2WD.
  • *3: Vehicles with 4WD.
  • *4: May not illuminate in some trouble causes.
  • *5: This diagnosis code is not set within the vehicle speed of 30 km/h or less.
  • *6: Vehicles with M/T.
  • *7: Vehicles with rear differential lock.
  • *8: Vehicles with A/T.
  • *9: This diagnosis code is not set within the vehicle speed of 10 km/h or less.

Under EBD, ABS, stability control, TCL, brake assist, HSA, TSA, BA, ESS in case of failure



ASTC-ECU
Diagnosis code No.
 Inspection item
 ABS
 EBD
 BA
TCL
ASC
HSA
 TSA
 ESS
C1200
 FR wheel speed sensor (signal open circuit)
 Prohibited
 Enabled*1
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 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)
C1202
 FR wheel speed sensor power circuit (malfunction power circuit)
 Prohibited
 Enabled*1
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 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)
C101C
 FR wheel speed sensor signal
 Prohibited
 Enabled*1
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
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
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
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
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
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
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1047
 FR wheel speed sensor phase
C1048
 RL wheel speed sensor phase
C1049
 RR wheel speed sensor phase
C1225*3
 Wheel Speed Sensor Malfunction (Abnormality in tyre size)
 Prohibited
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1226
 Control solenoid valve (FR) pressure holding system
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 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
C1300
 Linear valve (secondly)
C1310
 Linear valve (primary)
C1278
 Solenoid valve relay (open circuit)
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1279
 Solenoid valve relay (short circuit)
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1266
 Motor stuck
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1271
 Motor drive circuit malfunction
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1273
 Motor drive circuit stuck off
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1281
 Motor fail-safe relay stuck off
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1291*4
 Reverse signal (seizure)
 Enabled
 Enabled
 Enabled
 Enabled
 Enabled
 Prohibited
 Enabled
 Enabled
C1294*5
 Rear differential lock system malfunction
 Prohibited
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1295*6
 Transfer system malfunction
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C1366
 Lateral G sensor (output error)
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C1369
 G and yaw rate sensor (bank run record)
C1371
 Yaw rate sensor (output error, oscillation error, zero-point error)
C1377
 G and yaw rate sensor error
 Prohibited*2
 Enabled*2
 Prohibited*2
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited*2
C1381
 G sensor (output error, seizure)
 Prohibited*2
 Enabled
 Prohibited*2
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited*2
C1385
 Yaw rate sensor active check
 Prohibited*2
 Enabled
 Prohibited*2
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited*2
C1386
 G sensor active check
C1864
 G and yaw rate sensor power circuit
C1392
 G sensor (zero-point not calibrated)
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C1393
 Yaw rate sensor (zero-point not calibrated)
C1394
 Steering wheel sensor (zero-point not calibrated)
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C1395
 Brake fluid charging incompletion
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1396
 Engine torque input refusal
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C1860
 High voltage at ASTC-ECU power supply
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1861
 Low voltage at ASTC-ECU power supply
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1340
 Abnormal stop lamp switch circuit
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C1346
 Abnormal stop lamp circuit
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C121D
 Master cylinder pressure sensor malfunction
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C1361
 Abnormal master cylinder pressure sensor characteristics
C1505
 Steering wheel sensor (signal seizure or abnormal neutral point)
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
C1506
 Steering wheel sensor (steering wheel sensor malfunction)
C1707
 Implausible coding data
 Prohibited *7
 Prohibited *7
 Prohibited *7
 Prohibited*7
 Prohibited*7
 Prohibited*7
 Prohibited*7
 Prohibited *7
C2206
 Re-execution of variant coding
 Prohibited *7
 Enabled
 Prohibited *7
 Prohibited*7
 Prohibited*7
 Prohibited*7
 Prohibited*7
 Prohibited *7
U0401
 Engine ECU error
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
U0402*8
 T/M (CAN message)
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
U0428
 SAS (CAN message)
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
U1073
 Bus-off
 Prohibited
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
U1104
 Steering wheel sensor timeout error
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
U1100
 Engine-ECU timeout error
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
U1101*8
 A/T-ECU timeout error
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
U1108
 Meter CAN timeout
 Enabled
 Enabled
 Enabled
 Enabled
 Enabled
 Prohibited
 Enabled
 Enabled
U1109
 ETACS-ECU CAN timeout
 Prohibited
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
U1118*6
 Transfer-ECU timeout error
 Prohibited
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
U1195
 Coding not completed
 Prohibited *7
 Enabled
 Prohibited *7
 Prohibited *7
 Prohibited *7
 Prohibited *7
 Prohibited *7
 Prohibited *7
U1197
 Coding error
 Prohibited
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
U1211
 ENG Parity/Toggle bit error
Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
U1406
 Accelerator pedal position error
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
U1419
 SAS dynamic range error
 Enabled
 Enabled
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Enabled
note
  • *1: Disables when the system is defective on both rear wheels
  • *2: On 2WD, the system continues control.
  • *3: This diagnosis code is not set within the vehicle speed of 30 km/h or less.
  • *4: Vehicles with M/T.
  • *5: Vehicles with rear differential lock.
  • *6: Vehicles with 4WD.
  • *7: Enabled in some cases.
  • *8: Vehicles with 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 .