DIAGNOSTIC FUNCTION


ASC-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.
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 control
 Traction control operation status (engine control) when the diagnosis code is generated: OFF/ON
 -
12
 FL wheel TCL brake control
 FL wheel traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
 -
13
 FR wheel TCL brake control
 FR wheel traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
 -
14
 RL wheel TCL brake control
 RL wheel traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
 -
15
 RR wheel TCL brake control
 RR wheel traction control operation status (brake control) when the diagnosis code is generated: OFF/ON
 -
16
 FL wheel A.S.C. brake control
 FL wheel ASC control when the diagnosis code is generated: OFF/ON
 -
17
 FR wheel A.S.C. brake control
 FR wheel ASC control when the diagnosis code is generated: OFF/ON
 -
18
 RL wheel A.S.C. brake control
 RL wheel ASC control when the diagnosis code is generated: OFF/ON
 -
19
 RR wheel A.S.C. brake control
 RR wheel ASC control when the diagnosis code is generated: OFF/ON
 -
20
 Motor run
 Motor run condition when the diagnosis code is generated: OFF/ON
 -
21
 Stop lamp switch
 Stop lamp switch condition when the diagnosis code is generated: OFF/ON
 -
22
 Parking brake SW
 Parking brake switch condition when the diagnosis code is generated: OFF/ON
 -
23
 A.S.C. status
 ASC condition when the diagnosis code is generated: OFF/ON
 -
24
 HDC status
 -
 Not relevant for service
25
 Rear diff lock state
 -
 Not relevant for service
26
 Off-road mode
 -
 Not relevant for service
27
 Power supply voltage
 Voltage of power supply when the diagnosis code is generated
 V
28
 Steering angle
 Steering angle of steering wheel sensor when the diagnosis code is generated
 deg
29
 Yaw rate sensor
 Yaw rate of G and yaw rate sensor when the diagnosis code is generated
 deg/s
30
 Longitudinal G sensor
 Longitudinal G of G and yaw rate sensor when the diagnosis code is generated
 G
31
 Lateral G sensor
 Lateral G of G and yaw rate sensor when the diagnosis code is generated
 G
32
 Master cylinder pressure
 Master cylinder pressure of master cylinder pressure sensor when the diagnosis code is generated
 MPa
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 FUNCTIONS


When a malfunction is determined by the diagnostic function, ASC-ECU illuminates the brake warning lamp, ABS warning lamp, ASC indicator lamp or ASC OFF indicator lamp. At the same time, ASC-ECU prohibits the ABS, EBD, stability control, or TCL.
note The brake warning lamp is used as the EBD control warning lamp.

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


Diagnosis code No.
 Item
 Brake warning lamp
 ABS warning lamp
 ASC indicator lamp
 ASC OFF indicator lamp
C1011
 FL wheel speed sensor signal
 OFF
ON
 ON
 ON
C1014
 FL wheel speed sensor performance
 OFF
ON
 ON
 ON
C101C
 FR wheel speed sensor signal
 OFF
ON
 ON
 ON
C101F
 FR wheel speed sensor performance
 OFF
ON
 ON
 ON
C1027
 RL wheel speed sensor signal
 OFF
ON
 ON
 ON
C102A
 RL wheel speed sensor performance
 OFF
ON
 ON
 ON
C1032
 RR wheel speed sensor signal
 OFF
ON
 ON
 ON
C1035
 RR wheel speed sensor performance
 OFF
ON
 ON
 ON
C1041
 FL wheel speed sensor tone performance
 OFF
ON
 ON
 ON
C1042
 FR wheel speed sensor tone performance
 OFF
ON
 ON
 ON
C1043
 RL wheel speed sensor tone performance
 OFF
ON
 ON
 ON
C1044
 RR wheel speed sensor tone performance
 OFF
ON
 ON
 ON
C1200
 FR wheel speed sensor circuit
 OFF
 ON
ON
 ON
C1205
 FL wheel speed sensor circuit
 OFF
 ON
ON
 ON
C1210
 RR wheel speed sensor circuit
 OFF
 ON
ON
 ON
C1215
 RL wheel speed sensor circuit
 OFF
 ON
ON
 ON
C1222
 Wheel SPD. SNSR. power circuit
 OFF
ON
 ON
 ON
C1225
 Deviation between wheel speed
 ON*1
 ON
 ON
 ON
C1226
 FR inlet valve
 ON
 ON
 ON
 ON
C1231
 FR outlet valve
 ON
 ON
 ON
 ON
C1236
 FL inlet valve
 ON
 ON
 ON
 ON
C1241
 FL outlet valve
 ON
 ON
 ON
 ON
C1246
 RR inlet valve
 ON
 ON
 ON
 ON
C1251
 RR outlet valve
 ON
 ON
 ON
 ON
C1256
 RL inlet valve
 ON
 ON
 ON
 ON
C1261
 RL outlet valve
 ON
 ON
 ON
 ON
C1266
 Motor stuck
 ON
 ON
 ON
 ON
C1271
 Motor drive circuit
 ON
 ON
ON
 ON
C1273
 Motor drive circuit stuck off
 ON
 ON
ON
 ON
C1274
 Motor drive circuit stuck on
 ON
 ON
ON
 ON
C1276
 Valve power supply circuit
 ON
 ON
 ON
 ON
C1278
 Valve power circuit stuck off
 ON
 ON
 ON
 ON
C1279
 Valve power circuit stuck on
 ON
 ON
 ON
 ON
C1300
 FR cut valve
 ON
 ON
 ON
 ON
C1305
 FR suction valve
 ON
 ON
 ON
 ON
C1310
 FL cut valve
 ON
 ON
 ON
 ON
C1315
 FL suction valve
 ON
 ON
 ON
 ON
C1340
 Stop lamp switch
 OFF
 OFF*2
 ON
 OFF*2
C1361
 M/C pressure SNSR. stuck/low gain
 OFF
ON
 ON
 ON
C1364
 M/C pressure SNSR. malfunction
 OFF
 ON
 ON
 ON
C1366
 Lateral G-sensor (output error)
 OFF
 OFF
 ON
 ON
C1371
 Yaw rate sensor error
 OFF
 OFF
 ON
 ON
C1381
 G-sensor (output error, seizure)
 OFF
 OFF
 ON
 ON
C1385
 Yaw rate sensor active check
 OFF
 OFF
 ON
 ON
C1387
 Lateral G-sensor/G performance
 OFF
 OFF
 ON
 ON
C1392
 INCOMP. learn (Longitudinal G)
 OFF
 OFF
 ON
 ON
C1394
 INCOMP. learn neutral (SAS)
 OFF
 OFF
 ON
 ON
C1395
 INCOMP. brake fluid filling
 ON
 ON
 ON
 ON
C1396
 Engine torque input refusal
 OFF
 OFF
 ON
 ON
C1505
 Steering angle sensor (signal seizure or abnormal neutral point)
 OFF
 OFF
 ON
 ON
C1506
 Steering angle sensor error (steering wheel sensor malfunction)
 OFF
OFF
ON
 ON
C1555
 Steering angle SNS. out of range
 OFF
 OFF
 ON
 ON
C1607
 ECU failure
 ON
 ON
 ON
 ON
C1608
 EEPROM fail
 ON*1
 ON*1
 ON
 ON
C1707
 Implausible coding data
 ON
 ON
 ON
 ON
C1860
 Power supply high voltage
 ON*1
 ON
 ON
 ON
C1861
 Power supply low voltage
 ON*1
 ON
 ON
 ON
C2206
 Re-execution of variant coding
 ON
 ON
 ON
 ON
U0401
 Engine (CAN message)
 OFF
 OFF
 ON
 ON
U0402
 T/M (CAN message)
 OFF
 OFF
 ON
 ON
U0428
 SAS (CAN message)
 OFF
 OFF
 ON
 ON
U1073
 Bus-off
 OFF
 ON
 ON
 ON
U1100
 Engine CAN timeout
 OFF
 OFF
 ON
 ON
U1101
 T/M CAN timeout
 OFF
 OFF
 ON
 ON
U1104
 SAS CAN timeout
 OFF
 OFF
 ON
 ON
U1108
 Meter CAN timeout
 OFF
 OFF
 ON
 OFF
U1109
 ETACS CAN timeout
 OFF
 ON*1
 ON*1
 ON*1
U1195
 Coding not completed
 ON
 ON
 ON
 ON
U1200
 SAS parity error
 OFF
 OFF
 ON
 ON
U1204
 SAS message counter error
 OFF
 OFF
 ON
 ON
U1211
 ENG Parity/Toggle bit error
OFF
 OFF
 ON
 ON
note
  • *1: does not illuminate depending on a trouble cause.
  • *2: illuminates depending on a trouble cause.

Under EBD, ABS, TCL, ASC, BA control, HSA in case of failure


Diagnosis code No.
 Item
 EBD
 ABS
 TCL
 ASC
 BA control
 HSA
C1011
 FL wheel speed sensor signal
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1014
 FL wheel speed sensor performance
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C101C
 FR wheel speed sensor signal
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C101F
 FR wheel speed sensor performance
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1027
 RL wheel speed sensor signal
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C102A
 RL wheel speed sensor performance
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1032
 RR wheel speed sensor signal
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1035
 RR wheel speed sensor performance
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1041
 FL wheel speed sensor tone performance
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1042
 FR wheel speed sensor tone performance
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1043
 RL wheel speed sensor tone performance
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1044
 RR wheel speed sensor tone performance
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1200
 FR wheel speed sensor circuit
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1205
 FL wheel speed sensor circuit
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1210
 RR wheel speed sensor circuit
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1215
 RL wheel speed sensor circuit
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1222
 Wheel SPD. SNSR. power circuit
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1225
 Deviation between wheel speed
 Enabled*1
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1226
 FR inlet valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1231
 FR outlet valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1236
 FL inlet valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1241
 FL outlet valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1246
 RR inlet valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1251
 RR outlet valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1256
 RL inlet valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1261
 RL outlet valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1266
 Motor stuck
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1271
 Motor drive circuit
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1273
 Motor drive circuit stuck off
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1274
 Motor drive circuit stuck on
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1276
 Valve power supply circuit
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1278
 Valve power circuit stuck off
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1279
 Valve power circuit stuck on
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1300
 FR cut valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1305
 FR suction valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1310
 FL cut valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1315
 FL suction valve
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1340
 Stop lamp switch
 Enabled
 Enabled*1
 Enabled*1
 Enabled*1
 Enabled*1
 Prohibited
C1361
 M/C pressure SNSR. stuck/low gain
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1364
 M/C pressure SNSR. malfunction
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1366
 Lateral G-sensor (output error)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
C1371
 Yaw rate sensor
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
C1381
 G-sensor (output error, seizure)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
C1385
 Yaw rate sensor active check
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
C1387
 Lateral G-sensor/G performance
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
C1392
 INCOMP. learn (Longitudinal G)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
C1394
 INCOMP. learn neutral (SAS)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Enabled
C1395
 INCOMP. brake fluid filling
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1396
 Engine torque input refusal
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
C1505
 Steering angle sensor (signal seizure or abnormal neutral point)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Enabled
C1506
 Steering angle sensor error (steering wheel sensor malfunction)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Enabled
C1555
 Steering angle SNS. out of range
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Enabled
C1607
 ECU failure
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1608
 EEPROM fail
 Enabled*1
 Enabled*1
 Prohibited
 Prohibited
 Enabled*1
 Prohibited
C1707
 Implausible coding data
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1860
 Power supply high voltage
 Prohibited*2
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C1861
 Power supply low voltage
 Prohibited*2
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
C2206
 Re-execution of variant coding
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
U0401
 Engine (CAN message)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
U0402
 T/M (CAN message)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
U0428
 SAS (CAN message)
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Enabled
U1073
 Bus-off
 Enabled
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
U1100
 Engine CAN timeout
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
U1101
 T/M CAN timeout
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
U1104
 SAS CAN timeout
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Enabled
U1108
 Meter CAN timeout
 Enabled
 Enabled
 Enabled
 Enabled
 Enabled
 Prohibited
U1109
 ETACS CAN timeout
 Enabled
 Prohibited*2
 Prohibited*2
 Prohibited*2
 Prohibited*2
 Prohibited*2
U1195
 Coding not completed
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
 Prohibited
U1200
 SAS parity error
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Enabled
U1204
 SAS message counter error
 Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Enabled
U1211
 ENG Parity/Toggle bit error
Enabled
 Enabled
 Prohibited
 Prohibited
 Enabled
 Prohibited
note
  • *1: prohibited depending on a trouble cause.
  • *2: enabled depending on a trouble cause.