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DIAGNOSTIC FUNCTION
 
 
ASC-ECU has the following functions for easier system checks.
  • Diagnostic trouble code (DTC) set (Refer to ).
  • Service data output (Refer to ).
  • Actuator test (Refer to ).
  • Freeze frame data output (Refer to ).
All the above items can be diagnosed using scan tool (M.U.T.-III).
 
 
 
ON-BOARD DIAGNOSTICS
If the ASC-ECU detects any problem in the CAN communication line or the ECUs, which the ASC-ECU is communicating with, it sets a diagnostic trouble code (DTC). The DTCs can be confirmed by connecting scan tool (M.U.T.-III). The set DTCs are not erased even after the ignition switch has been turned to the "LOCK" (OFF) position, or the battery has been disconnected. The DTCs can be erased by operating scan tool (M.U.T.-III).
 
 
 
HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Ensure that the ignition switch is at the "LOCK" (OFF) position.
2. Start up the personal computer.
3. Connect special tool MB992747/M992748 or special tool MB991827 to special tool MB992744 or special tool MB991824 and the personal computer.
4. Connect special tool MB992745 or special tool MB991910 to special tool MB992744 or special tool MB991824.
5. Connect special tool MB992745 or special tool MB991910 to the data link connector.
noteWhen the special tool MB992745 is connected to the data link connector, the special tool MB992744 indicator light will be illuminated in a green color.
6. Turn the power switch of special tool MB991824 to the "ON" position. <When using the special tool MB991824>
noteWhen special tool MB991824 is energized, special tool MB991824 indicator light will be illuminated in a green color.
7. Start the M.U.T.-III system on the personal computer.
noteDisconnecting scan tool (M.U.T.-III) is the reverse of the connecting sequence, making sure that the ignition switch is at the "LOCK" (OFF) position.
 
 
 
HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III) to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System select."
4. Choose "from 2006 MY" under "MODEL YEAR".
5. Check that "Vehicle Information" contents are correct.
6. Choose "ABS/ASC/ASTC/WSS".
7. Select "Diagnostic Trouble Code"
8. If a DTC is set, it is shown.
9. Choose "Erase DTCs" to erase the DTC.
 
 
 
HOW TO READ DATA LIST
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III) to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System select."
4. Choose "from 2006 MY" under "MODEL YEAR".
5. Check that "Vehicle Information" contents are correct.
6. Choose "ABS/ASC/ASTC/WSS".
7. Select "Data List."
8. Choose an appropriate item and select the "OK" button.
 
 
 
HOW TO PERFORM ACTUATOR TEST
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III) to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System select."
4. Choose "from 2006 MY" under "MODEL YEAR".
5. Check that "Vehicle Information" contents are correct.
6. Choose "ABS/ASC/ASTC/WSS".
7. Choose "Actuator Test" from "A.S.C." screen.
8. Choose an appropriate item and select the "OK" button.
 
 
 
HOW TO DIAGNOSE THE CAN BUS LINE
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III) to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it matches the vehicle whose CAN bus lines will be diagnosed.
  • If they matches, go to Step 8.
  • If not, go to Step 5.
5. Select the "view vehicle information" button.
6. Enter the vehicle information and select the "OK" button.
7. When the vehicle information is displayed, confirm again that it matches the vehicle whose CAN bus lines will be diagnosed.
  • If they matches, go to Step 8.
  • If not, go to Step 5.
8. Select the "OK" button.
9. When the optional equipment screen is displayed, choose the one which the vehicle is fitted with, and then select the "OK" button.
 
 
 
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using the scan tool (M.U.T.-III).
 
 
When detecting fault and storing the DTC, the ECU connected to CAN bus line obtains the data before the determination of the DTC and the data when the DTC is determined, and then stores the ECU status of that time. By analyzing each data from scan tool (M.U.T.-III), the troubleshooting can be performed more efficiently. The displayed items are as the table below.
Display item list
Item No.Scan tool (M.U.T.-III) displayData itemUnit
1OdometerTotal driving distance after the DTC is generatedmile <vehicles for USA>
mile or Km <vehicles for Canada>
2Ignition cycleNumber of times the ignition switch is turned "ON" or "LOCK" (OFF) after the past failure transitionNumber of counts is displayed.
5FL wheel ABS controlFL wheel ABS control when the DTC is generated: OFF/ON-
6FR wheel ABS controlFR wheel ABS control when the DTC is generated: OFF/ON-
7RL wheel ABS controlRL wheel ABS control when the DTC is generated: OFF/ON-
8RR wheel ABS controlRR wheel ABS control when the DTC is generated: OFF/ON-
9EBD controlEBD control when the DTC is generated: OFF/ON-
10Brake assist controlBrake assist control when the DTC is generated: OFF/ON-
11Engine controlTraction control operation status (engine control) when the DTC is generated: OFF/ON-
12FL wheel TCL brake controlFL wheel traction control operation status (brake control) when the DTC is generated: OFF/ON-
13FR wheel TCL brake controlFR wheel traction control operation status (brake control) when the DTC is generated: OFF/ON-
14RL wheel TCL brake controlRL wheel traction control operation status (brake control) when the DTC is generated: OFF/ON-
15RR wheel TCL brake controlRR wheel traction control operation status (brake control) when the DTC is generated: OFF/ON-
16FL wheel A.S.C. brake controlFL wheel ASC control when the DTC is generated: OFF/ON-
17FR wheel A.S.C. brake controlFR wheel ASC control when the DTC is generated: OFF/ON-
18RL wheel A.S.C. brake controlRL wheel ASC control when the DTC is generated: OFF/ON-
19RR wheel A.S.C. brake controlRR wheel ASC control when the DTC is generated: OFF/ON-
20Motor runPump motor condition when the DTC is generated: OFF/ON-
21Stoplight switchStoplight switch condition when the DTC is generated: OFF/ON-
22Parking brake switchParking brake switch condition when the DTC is generated: OFF/ON-
23A.S.C. statusASC control condition when the DTC is generated: OFF/ON-
24HDC status-Not relevant for service
25Rear diff lock state-Not relevant for service
26Off-road mode-Not relevant for service
27Power supply voltageVoltage of power supply when the DTC is generatedV
28Steering angleSteering angle of steering wheel sensor when the DTC is generateddeg
29Yaw rate sensorYaw rate of G and yaw rate sensor when the DTC is generateddeg/s
30Longitudinal G sensorLongitudinal G of G and yaw rate sensor when the DTC is generatedG
31Lateral G sensorLateral G of G and yaw rate sensor when the DTC is generatedG
32Master cylinder pressureMaster cylinder pressure of master cylinder pressure sensor when the DTC is generatedpsi <vehicles for USA>
psi or MPa <vehicles for Canada>
33FL wheel speed sensorWheel speed (FL) when the DTC is generatedmph <vehicles for USA>
mph or Km/h <vehicles for Canada>
34FR wheel speed sensorWheel speed (FR) when the DTC is generatedmph <vehicles for USA>
mph or Km/h <vehicles for Canada>
35RL wheel speed sensorWheel speed (RL) when the DTC is generatedmph <vehicles for USA>
mph or Km/h <vehicles for Canada>
36RR wheel speed sensorWheel speed (RR) when the DTC is generatedmph <vehicles for USA>
mph or Km/h <vehicles for Canada>
 
 
FAIL-SAFE FUNCTIONS
  • When a malfunction is determined by the diagnostic function, ASC-ECU illuminates the brake warning light, ABS warning light, ASC indicator light, and ASC OFF indicator light. At the same time, ASC-ECU prohibits the ABS, EBD, stability control, and TCL.
    noteThe brake warning light is used as the EBD control warning light.
 
 
Illumination condition of warning light and indicator light in case of failure
DTCScan tool (M.U.T.-III) displayBrake warning lightABS warning lightASC indicator lightASC OFF indicator light
C1011FL wheel speed sensor signalOFFONONON
C1014FL wheel speed SNS.performanceOFF ONONON
C101CFR wheel speed sensor signalOFF ONONON
C101FFR wheel speed SNS.performanceOFF ONONON
C1027RL wheel speed sensor signalOFF ONONON
C102ARL wheel speed SNS.performanceOFF ONONON
C1032RR wheel speed sensor signalOFF ONONON
C1035RR wheel speed SNS.performanceOFF ONONON
C1041FL wheel speed tone performanceOFF ONONON
C1042FR wheel speed tone performanceOFF ONONON
C1043RL wheel speed tone performanceOFF ONONON
C1044RR wheel speed tone performanceOFF ONONON
C1200FR wheel speed sensorOFFON ONON
C1205FL wheel speed sensorOFFON ONON
C1210RR wheel speed sensorOFFON ONON
C1215RL wheel speed sensorOFFON ONON
C1222Wheel SPD.SNSR.power circuitOFF ONONON
C1225Deviation between wheel speedON*1ONONON
C1226FR inlet valveONONONON
C1231FR outlet valveONONONON
C1236FL inlet valveONONONON
C1241FL outlet valveONONONON
C1246RR inlet valveONONONON
C1251RR outlet valveONONONON
C1256RL inlet valveONONONON
C1261RL outlet valveONONONON
C1266Motor stuckONONONON
C1271Motor drive circuitONON ONON
C1273Motor drive circuit stuck offONON ONON
C1274Motor drive circuit stuck onONON ONON
C1276Valve power supply circuitONONONON
C1278Valve power circuit stuck offONONONON
C1279Valve power circuit stuck onONONONON
C1291Reverse switch <M/T>OFF OFF ONOFF
C1300FR cut valveONONONON
C1305FR suction valveONONONON
C1310FL cut valveONONONON
C1315FL suction valveONONONON
C1340Stoplight switchOFFOFF*2ONOFF*2
C1361M/C pressure SNSR.stuck/low gainOFF ONONON
C1364M/C pressure SNSR.malfunctionOFFONONON
C1366Lateral G SNSR.stuck/low gainOFFOFFONON
C1371Yaw rate SNSR.stuck/low gainOFFOFFONON
C1381Longitudinal G stuck/low gainOFFOFFONON
C1385Yaw rate sensorOFFOFFONON
C1387Lateral G sensor/G performanceOFFOFFONON
C1392INCOMP.learn (Longitudinal G)OFFOFFONON
C1394INCOMP.learn neutral(SAS)OFFOFFONON
C1395INCOMP. Brake fluid fillingONONONON
C1396Engine torque input refusalOFFOFFONON
C1505Steering angle sensorOFFOFFONON
C1506Steering angle sensor errorOFF OFF ONON
C1555Steering angle SNS.out of rangeOFFOFFONON
C1607ECU failureONONONON
C1608EEPROM failON*1ON*1ONON
C1707Implausible coding dataONONONON
C1860Power supply high voltageON*1ONONON
C1861Power supply low voltageON*1ONONON
C2206Re-execution of variant codingONONONON
U0401Engine (CAN message)OFFOFFONON
U0402T/M (CAN message)OFFOFFONON
U0428SAS (CAN message)OFFOFFONON
U1073Bus-offOFFONONON
U1100Engine CAN timeoutOFFOFFONON
U1101T/M CAN timeout/Not equippedOFFOFFONON
U1104SAS CAN timeout/Not equippedOFFOFFONON
U1108Meter CAN timeout/Not equippedOFFOFFONOFF
U1109ETACS CAN timeout/Not equippedOFFON*1ON*1ON*1
U1195Coding not completedONONONON
U1200SAS parity errorOFFOFFONON
U1204SAS message counter errorOFFOFFONON
U1211ENG Parity/Toggle bit error OFFOFFONON
note
  • *1: does not illuminate depending on a trouble cause.
  • *2: illuminates depending on a trouble cause.
 
 
Under EBD, ABS, TCL, ASC, Brake Assist (BA) control and HSA in case of failure
DTCScan tool (M.U.T.-III) displayEBDABSTCLASCBA controlHSA
C1011FL wheel speed sensor signalEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1014FL wheel speed SNS.performanceEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C101CFR wheel speed sensor signalEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C101FFR wheel speed SNS.performanceEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1027RL wheel speed sensor signalEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C102ARL wheel speed SNS.performanceEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1032RR wheel speed sensor signalEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1035RR wheel speed SNS.performanceEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1041FL wheel speed tone performanceEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1042FR wheel speed tone performanceEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1043RL wheel speed tone performanceEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1044RR wheel speed tone performanceEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1200FR wheel speed sensorEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1205FL wheel speed sensorEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1210RR wheel speed sensorEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1215RL wheel speed sensorEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1222Wheel SPD.SNSR.
power circuit		EnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1225Deviation between wheel speedEnabled*1ProhibitedProhibitedProhibitedProhibitedProhibited
C1226FR inlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1231FR outlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1236FL inlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1241FL outlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1246RR inlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1251RR outlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1256RL inlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1261RL outlet valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1266Motor stuckProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1271Motor drive circuitProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1273Motor drive circuit stuck offProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1274Motor drive circuit stuck onProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1276Valve power supply circuitProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1278Valve power circuit stuck offProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1279Valve power circuit stuck onProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1291Reverse switch
<M/T>		EnabledEnabledEnabledEnabledEnabledProhibited
C1300FR cut valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1305FR suction valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1310FL cut valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1315FL suction valveProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1340Stoplight switchEnabledEnabled*1Enabled*1Enabled*1Enabled*1Prohibited
C1361M/C pressure SNSR.stuck/low gainEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1364M/C pressure SNSR.malfunctionEnabledProhibitedProhibitedProhibitedProhibitedProhibited
C1366Lateral G SNSR.
stuck/low gain		EnabledEnabledProhibitedProhibitedEnabledProhibited
C1371Yaw rate SNSR.
stuck/low gain		EnabledEnabledProhibitedProhibitedEnabledProhibited
C1381Longitudinal G stuck/low gainEnabledEnabledProhibitedProhibitedEnabledProhibited
C1385Yaw rate sensorEnabledEnabledProhibitedProhibitedEnabledProhibited
C1387Lateral G sensor/G performanceEnabledEnabledProhibitedProhibitedEnabledProhibited
C1392INCOMP.learn (Longitudinal G)EnabledEnabledProhibitedProhibitedEnabledProhibited
C1394INCOMP.learn neutral(SAS)EnabledEnabledProhibitedProhibitedEnabledEnabled
C1395INCOMP. Brake fluid fillingProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1396Engine torque input refusalEnabledEnabledProhibitedProhibitedEnabledProhibited
C1505Steering angle sensorEnabledEnabledProhibitedProhibitedEnabledEnabled
C1506Steering angle sensor errorEnabledEnabledProhibitedProhibitedEnabledEnabled
C1555Steering angle SNS.out of rangeEnabledEnabledProhibitedProhibitedEnabledEnabled
C1607ECU failureProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1608EEPROM failEnabled*1Enabled*1ProhibitedProhibitedEnabled*1Prohibited
C1707Implausible coding dataProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1860Power supply high voltageProhibited*2ProhibitedProhibitedProhibitedProhibitedProhibited
C1861Power supply low voltageProhibited*2ProhibitedProhibitedProhibitedProhibitedProhibited
C2206Re-execution of variant codingProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
U0401Engine (CAN message)EnabledEnabledProhibitedProhibitedEnabledProhibited
U0402T/M (CAN message)EnabledEnabledProhibitedProhibitedEnabledProhibited
U0428SAS (CAN message)EnabledEnabledProhibitedProhibitedEnabledEnabled
U1073Bus-offEnabledProhibitedProhibitedProhibitedProhibitedProhibited
U1100Engine CAN timeoutEnabledEnabledProhibitedProhibitedEnabledProhibited
U1101T/M CAN timeout/Not equippedEnabledEnabledProhibitedProhibitedEnabledProhibited
U1104SAS CAN timeout/Not equippedEnabledEnabledProhibitedProhibitedEnabledEnabled
U1108Meter CAN timeout/Not equippedEnabledEnabledEnabledEnabledEnabledProhibited
U1109ETACS CAN timeout/Not equippedEnabledProhibited*2Prohibited*2Prohibited*2Prohibited*2Prohibited*2
U1195Coding not completedProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
U1200SAS parity errorEnabledEnabledProhibitedProhibitedEnabledEnabled
U1204SAS message counter errorEnabledEnabledProhibitedProhibitedEnabledEnabled
U1211ENG Parity/Toggle bit error EnabledEnabledProhibitedProhibitedEnabledProhibited
note
  • *1: prohibited depending on a trouble cause.
  • *2: enabled depending on a trouble cause.