Code No. C1014: FL wheel speed sensor performance
Code No. C101F: FR wheel speed sensor performance
Code No. C102A: RL wheel speed sensor performance
Code No. C1035: RR wheel speed sensor performance
caution |
- If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - Troubleshooting
).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit assembly (integrated with ASTC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G sensor (Refer to
).
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OPERATION
- A toothed rotor (for wheel speed sensor) generates a voltage pulse as it moves across the pickup field of each wheel speed sensor.
- The wheel speed sensor transmit the frequency of the pulses to the ASTC-ECU.
DIAGNOSIS CODE SET CONDITIONS
ASTC-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, ASTC-ECU will set the relevant diagnosis code.
- Irregular change in the wheel speed sensor signal
PROBABLE CAUSES
Current trouble
- Malfunction of the wheel speed sensor
- Excessive gap between the wheel speed sensor and the rotor (for wheel speed detection)
- Malfunction of the wheel speed sensor installation
- Malfunction of the wheel bearing
- Malfunction of the front axle hub assembly
- Malfunction of the Axle shaft bearing
- Deformation of the rotor (for wheel speed detection)
- Damaged wiring harness and connectors
- Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)
Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and connector failures between ASTC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (GROUP 00 - How to Cope with Intermittent Malfunctions
).
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is diagnosis code No. C101F, C1014, C1035 or C102A set?
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Go to Step 3.
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The procedure is complete.
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STEP 3. M.U.T.-III data list
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Check the following data list (Refer to ).
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- (When code No. C1014 is set) Item No. 01: FL wheel speed sensor
- (When code No. C101F is set) Item No. 02: FR wheel speed sensor
- (When code No. C102A is set) Item No. 03: RL wheel speed sensor
- (When code No. C1035 is set) Item No. 04: RR wheel speed sensor
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 4.
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STEP 4. Harness and connector check
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(1)Check the wheel speed sensor (FL, FR, RL or RR).
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(2)Check the ASTC-ECU connector.
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(3)Check the wiring harness and connector between the ASTC-ECU connector and the wheel speed sensor (FL, FR, RL or RR).
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the defective connector or the wiring harness. Then go to Step 10.
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STEP 5. Check for wheel speed sensor installation
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Refer to .
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the wheel speed sensor. Then go to Step 10.
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STEP 6. Check for wheel speed sensor as a single unit
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Refer to .
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Q.
Is the check result normal?
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Go to Step 7.
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Replace the wheel speed sensor (Refer to ). Then go to Step 10.
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STEP 7. Check for rotor (for wheel speed detection) installation
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<Front>
- Refer to GROUP 26 - Front Axle Hub Assembly Removal and Installation
<2WD>.
- Refer to GROUP 26 - Driveshaft Assembly Removal and Installation
<4WD>.
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<Rear>
- Refer to GROUP 27 - Axle Shaft Assembly Disassembly and Reassembly
.
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Q.
Is the check result normal?
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Go to Step 8.
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Replace the rotor (for wheel speed detection). Then go to Step 10.
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STEP 8. Front axle hub assembly and wheel bearing or axle shaft bearing check
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- Check the front axle hub assembly (Refer to GROUP 26, Front Axle Hub Assembly Removal and Installation
).
- Check the wheel bearing (Refer to GROUP 26, On-vehicle Service
).
- Check the axle shaft bearing (Refer to GROUP 27, On-vehicle Service
).
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Q.
Is the check result normal?
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Go to Step 9.
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Replace the front axle hub assembly or wheel bearing or axle shaft bearing. Then go to Step 10.
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STEP 9. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch to the "ON" position.
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(2)Turn the ignition switch to the "LOCK" (OFF) position.
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(3)Drive the vehicle at 15 km/h or more.
note |
The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 15 km/h or higher.
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Q.
Is diagnosis code No. C101F, C1014, C1035 or C102A set?
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Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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STEP 10. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch to the "ON" position.
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(2)Turn the ignition switch to the "LOCK" (OFF) position.
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(3)Drive the vehicle at 15 km/h or more.
note |
The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 15 km/h or higher.
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Q.
Is diagnosis code No. C101F, C1014, C1035 or C102A set?
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Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
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This diagnosis is complete.
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