DTC C100A: Abnormality in FL wheel speed sensor circuit
Wheel Speed Sensor Circuit
CAUTION
If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines.
CIRCUIT OPERATION
DTC SET CONDITIONS
ABS-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ABS-ECU detects the open or short circuit in the circuit, it will set a DTC.
PROBABLE CAUSES
Current trouble
Past trouble
DIAGNOSIS
Required Special Tools:
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is the DTC C100A set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Scan tool data list
Check the following data list.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Go to Step 4.
STEP 4. Voltage measurement at the A-01 ABS-ECU connector
NOTE: Do not connect the special tool ABS check harness(MB991974) to ABS-ECU.
OK: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 5.
NO (Not normal at the terminal No.18 or 19) : Go to Step 6.
STEP 5. Resistance measurement at A-01 ABS-ECU connector
NOTE: Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 8.
NO (Not normal at the terminal No.18 or 19) : Go to Step 6.
STEP 6. Connector check: A-01 ABS-ECU connector, A-11 front wheel speed sensor <LH> connector
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the defective connector. Then go to Step 13.
STEP 7. Wiring harness check between A-01 ABS-ECU connector terminal No.18 and A-11 front wheel speed sensor <LH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.19 and A-11 front wheel speed sensor <LH> connector terminal No.2.
Q: Is the check result normal?
YES : Replace the wheel speed sensor <FL>. Then go to Step 13.
NO : Repair the wiring harness. Then go to Step 13.
STEP 8. Voltage measurement at the A-01 ABS-ECU connector
OK:
Terminal No.18 and body ground: Approximately
system voltage
Terminal No.19 and body ground: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 11.
STEP 9. Wiring harness check between A-01 ABS-ECU connector terminal No.18 and A-11 front wheel speed sensor <LH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.19 and A-11 front wheel speed sensor <LH> connector terminal No.2.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the wiring harness. Then go to Step 13.
STEP 10. Check for wheel speed sensor <FL> as a single unit.
Q: Is the check result normal?
YES : Go to Step 11.
NO : Replace the wheel speed sensor <FL>. Then go to Step 13.
STEP 11. Connector check: A-01 ABS-ECU connector, A-11 front wheel speed sensor <LH> connector
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair the defective connector. Then go to Step 13.
STEP 12. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C100A set?
YES : Replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 13.
NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
STEP 13. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C100A set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C1015: Abnormality in FR wheel speed sensor circuit
Wheel Speed Sensor Circuit
CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Line Diagnostic Flow).
CIRCUIT OPERATION
DTC SET CONDITIONS
ABS-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ABS-ECU detects the open or short circuit in the circuit, it will set a DTC.
PROBABLE CAUSES
Current trouble
Past trouble
DIAGNOSIS
Required Special Tools:
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is the DTC C1015 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Scan tool data list
Check the following data list.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Go to Step 4.
STEP 4. Voltage measurement at the A-01 ABS-ECU connector
NOTE: Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
OK: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 5.
NO (Not normal at the terminal No.22 or 21) : Go to Step 6.
STEP 5. Resistance measurement at A-01 ABS-ECU connector
NOTE: Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 8.
NO (Not normal at the terminal No.22 or 21) : Go to Step 6.
STEP 6. Connector check: A-01 ABS-ECU connector, A-59 front wheel speed sensor <RH> connector
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the defective connector.
STEP 7. Wiring harness check between A-01 ABS-ECU connector terminal No.22 and A-59 front wheel speed sensor <RH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.21 and A-59 front wheel speed sensor <RH> connector terminal No.2.
Q: Is the check result normal?
YES : Replace the wheel speed sensor <FR>. Then go to Step 13.
NO : Repair the wiring harness. Then go to Step 13.
STEP 8. Voltage measurement at the A-01 ABS-ECU connector
OK:
Terminal No.22 and body ground: Approximately
system voltage
Terminal No.21 and body ground: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 11.
STEP 9. Wiring harness check between A-01 ABS-ECU connector terminal No.22 and A-59 front wheel speed sensor <RH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.21 and A-59 front wheel speed sensor <RH> connector terminal No.2.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the wiring harness. Then go to Step 13.
STEP 10. Check for wheel speed sensor <FR> as a single unit.
Q: Is the check result normal?
YES : Go to Step 11.
NO : Replace the wheel speed sensor <FR> . Then go to Step 13.
STEP 11. Connector check: A-01 ABS-ECU connector, A-59 front wheel speed sensor <RH> connector
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair the defective connector. Then go to Step 13.
STEP 12. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1015 set?
YES : Replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 13.
NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
STEP 13. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1015 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C1020: Abnormality in RL wheel speed sensor circuit
Wheel Speed Sensor Circuit
CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Line Diagnostic Flow).
CIRCUIT OPERATION
DTC SET CONDITIONS
PROBABLE CAUSES
Current trouble
Past trouble
DIAGNOSIS
Required Special Tools:
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is the DTC C1020 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Scan tool data list
Check the following data list.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Go to Step 4.
STEP 4. Voltage measurement at the A-01 ABS-ECU connector
NOTE: Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
OK: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 5.
NO (Not normal at the terminal No.24 or No.25) : Go to Step 6.
STEP 5. Resistance measurement at A-01 ABS-ECU connector
NOTE: Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 8.
NO (Not normal at the terminal No.24 or No.25) : Go to Step 6.
STEP 6. Connector check: A-01 ABS-ECU connector, C-129 intermediate connector, D-114 rear wheel speed sensor <LH> connector
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the defective connector. Then go to Step 13.
STEP 7. Wiring harness check between A-01 ABS-ECU connector terminal No.24 and D-114 rear wheel speed sensor <LH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.25 and D-114 rear wheel speed sensor <LH> connector terminal No.2.
Q: Is the check result normal?
YES : Replace the wheel speed sensor <RL> . Then go to Step 13.
NO : Repair the wiring harness. Then go to Step 13.
STEP 8. Voltage measurement at the A-01 ABS-ECU connector
OK:
Terminal No.24 and body ground: Approximately
system voltage
Terminal No.25 and body ground: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 11.
STEP 9. Wiring harness check between A-01 ABS-ECU connector terminal No.24 and D-114 rear wheel speed sensor <LH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.25 and D-114 rear wheel speed sensor <LH> connector terminal No.2.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the wiring harness.
STEP 10. Check for wheel speed sensor <RL> as a single unit. Q: Is the check result normal?
YES : Go to Step 11.
NO : Replace the wheel speed sensor <RL> . Then go to Step 13.
STEP 11. Connector check: A-01 ABS-ECU connector, C-129 intermediate connector, D-114 rear wheel speed sensor <LH> connector
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair the defective connector. Then go to Step 13.
STEP 12. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1020 set?
YES : Replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 13.
NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
STEP 13. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1020 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C102B: Abnormality in RR wheel speed sensor circuit
Wheel Speed Sensor Circuit
CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Line Diagnostic Flow).
CIRCUIT OPERATION
DTC SET CONDITIONS
ABS-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ABS-ECU detects the open or short circuit in the circuit, it will set a DTC.
PROBABLE CAUSES
Current trouble
Past trouble
DIAGNOSIS
Required Special Tools:
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is the DTC C102B set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Scan tool data list
Check the following data list.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Go to Step 4.
STEP 4. Voltage measurement at the A-01 ABS-ECU connector
NOTE: Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
OK: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 5.
NO (Not normal at the terminal No.16 or 15) : Go to Step 6.
STEP 5. Resistance measurement at A-01 ABS-ECU connector
NOTE: Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 8.
NO (Not normal at the terminal No.16 or 15) : Go to Step 6.
STEP 6. Connector check: A-01 ABS-ECU connector, C-129 intermediate connector, D-133 rear wheel speed sensor <RH> connector
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the defective connector. Then go to Step 13.
STEP 7. Wiring harness check between A-01 ABS-ECU connector terminal No.16 and D-133 rear wheel speed sensor <RH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.15 and D-133 rear wheel speed sensor <RH> connector terminal No.2.
Q: Is the check result normal?
YES : Replace the wheel speed sensor <RR>. Then go to Step 13.
NO : Repair the wiring harness. Then go to Step 13.
STEP 8. Voltage measurement at the A-01 ABS-ECU connector
OK:
Terminal No.16 and body ground: Approximately
system voltage
Terminal No.15 and body ground: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 11.
STEP 9. Wiring harness check between A-01 ABS-ECU connector terminal No.16 and D-133 rear wheel speed sensor <RH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.15 and D-133 rear wheel speed sensor <RH> connector terminal No.2.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the wiring harness.
STEP 10. Check for wheel speed sensor <RR> as a single unit
Q: Is the check result normal?
YES : Go to Step 11.
NO : Replace the wheel speed sensor <RR>. Then go to Step 13.
STEP 11. Connector check: A-01 ABS-ECU connector, C-129 intermediate connector, D-133 rear wheel speed sensor <RH> connector
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair the defective connector. Then go to Step 13.
STEP 12. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C102B set?
YES : Replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 13.
NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
STEP 13. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C102B set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C1011: Abnormality in FL wheel speed sensor signal
Wheel Speed Sensor Circuit
CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Line Diagnostic Flow).
CIRCUIT OPERATION
DTC SET CONDITIONS
ABS-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ABS-ECU will set the relevant DTC.
PROBABLE CAUSES
Current trouble
Past trouble
For diagnosis procedures, refer to How to treat past trouble (Refer to GROUP 00 − How to Use Troubleshooting/How to Treat Past Trouble).
DIAGNOSIS
Required Special Tools:
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C1011 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC
Check that the DTC C100A is also set.
Q: Is DTC C100A also set?
YES : Perform the diagnosis for the DTC C100A.
NO : Go to Step 4.
STEP 4. Connector check: A-01 ABS-ECU connector, A-11 front wheel speed sensor <LH> connector
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the defective connector. Then go to Step 12.
STEP 5. Wiring harness check between A-01 ABS-ECU connector terminal No.18 and A-11 front wheel speed sensor <LH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.19 and A-11 front wheel speed sensor <LH> connector terminal No.2.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the wiring harness. Then go to Step 12.
STEP 6. Check wheel speed sensor <FL> installation
Check how the wheel speed sensor <FL> is installed (Disconnection of wheel speed sensor <FL>, loose mounting bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Reinstall the wheel speed sensor <FL>. Then go to Step 7.
STEP 7. Check for wheel speed sensor <FL> output current.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel speed sensor <FL>. Then go to Step 11.
STEP 8. Check for wheel bearing looseness
NOTE:
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the wheel bearing <FL> (Refer to GROUP 26 − Front Axle Hub Assembly). Then go to Step 12.
STEP 9. Check wheel speed detection encoder
Check the encoder for adhesion of foreign materials or deformation.
Q: Is the check result normal?
YES : Go to Step 10.
NO (Adhesion of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 12.
NO (Deformation) : Replace the wheel bearing <FL> (Refer to GROUP 26 − Front Axle Hub Assembly). Then go to Step 12.
STEP 10. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1011 set?
YES : Replace the wheel speed sensor <FL>. Then go to Step 11.
NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
STEP 11. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1011 set?
YES : Replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 12.
NO : The procedure is complete.
STEP 12. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1011 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C101C Abnormality in FR wheel speed sensor signal
Wheel Speed Sensor Circuit
CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Line Diagnostic Flow).
CIRCUIT OPERATION
DTC SET CONDITIONS
ABS-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ABS-ECU will set the relevant DTC.
PROBABLE CAUSES
Current trouble
Past trouble
DIAGNOSIS
Required Special Tools:
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C101C set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC
Check that the DTC C1015 is also set.
Q: Is DTC C1015 also set?
YES : Perform the diagnosis for the DTC C1015.
NO : Go to Step 4.
STEP 4. Connector check: A-01 ABS-ECU connector, A-59 front wheel speed sensor <RH> connector
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the defective connector. Then go to Step 12.
STEP 5. Wiring harness check between A-01 ABS-ECU connector terminal No.22 and A-59 front wheel speed sensor <RH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.21 and A-59 front wheel speed sensor <RH> connector terminal No.2.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the wiring harness. Then go to Step 12.
STEP 6. Check wheel speed sensor <FR> installation Check how the wheel speed sensor <FR> is installed (Disconnection of wheel speed sensor <FR>, loose mounting bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Reinstall the wheel speed sensor <FR> correctly. Then go to Step 7.
STEP 7. Check for wheel speed sensor <FR> output current
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel speed sensor <FR>. Then go to Step 11.
STEP 8. Check for wheel bearing looseness
NOTE:
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the wheel bearing <FR> (Refer to GROUP 26 − Front Axle Hub Assembly). Then go to Step 12.
STEP 9. Check wheel speed detection encoder
Check the encoder for adhesion of foreign materials or deformation.
Q: Is the check result normal?
YES : Go to Step 10.
NO (Adhesion of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 12.
NO (Deformation) : Replace the wheel bearing <FR> (Refer to GROUP 26 − Front Axle Hub Assembly). Then go to Step 12.
STEP 10. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C101C set?
YES : Replace the wheel speed sensor <FR>. Then go to Step 11.
NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
STEP 11. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C101C set?
YES : Replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 12.
NO : The procedure is complete.
STEP 12. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C101C set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C1027: Abnormality in RL wheel speed sensor signal
Wheel Speed Sensor Circuit
CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Line Diagnostic Flow).
CIRCUIT OPERATION
DTC SET CONDITIONS
ABS-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ABS-ECU will set the relevant DTC.
PROBABLE CAUSES
Current trouble
Past trouble
DIAGNOSIS
Required Special Tools:
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C1027 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC
Check that the DTC C1020 is also set.
Q: Is DTC C1020 also set?
YES : Perform the diagnosis for the DTC C1020.
NO : Go to Step 4.
STEP 4. Connector check: A-01 ABS-ECU connector, C-129 intermediate connector, D-114 rear wheel speed sensor <LH> connector
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the defective connector. Then go to Step 12.
STEP 5. Wiring harness check between A-01 ABS-ECU connector terminal No.24 and D-114 rear wheel speed sensor <LH> connector terminal No.1, and between A-01 ABS-ECU connector terminal No.25 and D-114 rear wheel speed sensor <LH> connector terminal No.2.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the wiring harness. Then go to Step 12.
STEP 6. Check wheel speed sensor <RL> installation
Check how the wheel speed sensor <RL> is installed (Disconnection of wheel speed sensor <RL>, loose mounting bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Reinstall the wheel speed sensor <RL> correctly. Then go to Step 7.
STEP 7. Check for wheel speed sensor <RL> output current
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel speed sensor <RL>. Then go to Step 11.
STEP 8. Check for wheel bearing looseness
NOTE:
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the rear wheel hub assembly <RL> (Refer to GROUP 27A − Rear Axle Hub Assembly).
Then go to Step 12.
STEP 9. Check wheel speed detection encoder
Check the encoder for adhesion of foreign materials or deformation.
Q: Is the check result normal?
YES : Go to Step 10.
NO (Adhesion of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 12.
NO (Deformation) : Replace the rear wheel hub assembly <RL> (Refer to GROUP 27A − Rear Axle Hub Assembly). Then go to Step 12.
STEP 10. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1027 set?
YES : Replace the wheel speed sensor <RL>. Then go to Step 11.
NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
STEP 11. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1027 set?
YES : Replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 12.
NO : The procedure is complete.
STEP 12. Check whether the DTC is reset.
NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.
Q: Is DTC C1027 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C1032: Abnormality in RR wheel speed sensor signal
Wheel Speed Sensor Circuit
CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Line Diagnostic Flow).
CIRCUIT OPERATION
DTC SET CONDITIONS
ABS-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ABS-ECU will set the relevant DTC.
PROBABLE CAUSES
Current trouble
Past trouble
DIAGNOSIS
Required Special Tools:
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C1032 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC
Check that the DTC C102B is also set.
Q: Is DTC C102B also set?
YES : Perform the diagnosis for the DTC C102B.
NO : Go to Step 4.
STEP 4. Connector check: A-01 ABS-ECU connector,
C-129 intermediate connector, READ NEXT:
DTC C1041, C1042, C1043, C1044, C1046, C1047, C1048, C1049, C104B,
C104F, C1053, C1057, C105F, C1063, C1067, C105B
DTC C1041: Abnormality in periodical signal for FL wheel speed sensor
CAUTION
If there is any problem in the CAN bus lines, an incorrect
DTC may be set. Prior to this diagnosis, diagnose
the CAN b
DTC C2104, C1073, C2116, C1000, C2200, C2100, C2101, C1395, C2203,
C1608, U0001, U0100, U0141, U1415, U1417
DTC C2104 Faulty valve power supply circuit
Power Supply Circuit
CAUTION
If there is any problem in the CAN bus lines, an incorrect
DTC may be set. Prior to this diagnosis, diagnose the CAN
bus line
Symptom Chart, Symptom Procedures
SYMPTOM CHART
CAUTION
ABS may operate in the following conditions without hard braking:
Slippery road surface,
high-speed turn, and bumpy road surface. When asking the customers, confirm
that t
SEE MORE:
Diagnostic Trouble Code Procedures
DTC 15: Cruise Control Switch System
Cruise Control Switch Circuit
CIRCUIT OPERATION
This circuit judges the signals of each switch
("ON/OFF", "CANCEL", "COAST/SET" and
"ACC/RES") of the cruise control switch. The ECM
detects the state of the cruise control switch by sensing
the voltages shown bel
Diagnostic Item 24-25
DIAGNOSTIC ITEM 24: Short to power supply or ground in both CAN_H and
CAN_L lines of the
CAN-B bus lines.
CAUTION
When servicing a CAN bus line, ground yourself
by touching a metal object such as an unpainted
water pipe. If you fail to do so, a component connected
to the CAN bus line may be damage