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 - CAN Bus Diagnostics Table
 ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
|
OPERATION
- A toothed rotor (for wheel speed detection) 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 ABS-ECU.
- The hydraulic unit assembly (integrated with ABS-ECU) modulates the amount of braking force individually applied to each wheel cylinder.
DIAGNOSIS CODE 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 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 ABS-ECU)
Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and connector failures between ABS-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (GROUP 00 - How to Cope with Intermittent Malfunctions ).
|
|
STEP 1. M.U.T.-III CAN bus diagnosis
|
|
|
Use M.U.T.-III to diagnose the CAN bus lines.
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 3.
|
|
|
|
|
|
 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
|
|
|
|
|
|
STEP 2. Diagnosis code recheck after resetting CAN bus lines
|
|
|
(1)Turn the ignition switch to the "ON" position.
|
|
|
(2)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
(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.
|
|
|
|
(4)Erase the diagnosis code.
|
|
|
Q.
Is diagnosis code No. C101F, C1014, C1035 or C102A set?
|
|
|
Go to Step 3.
|
|
|
|
|
|
The procedure is complete.
|
|
|
|
|
|
STEP 3. M.U.T.-III data list
|
|
|
Check the following data list (Refer to ).
|
|
|
- (When code No. C1014 is set) Item 01: FL wheel speed sensor
- (When code No. C101F is set) Item 02: FR wheel speed sensor
- (When code No. C102A is set) Item 03: RL wheel speed sensor
- (When code No. C1035 is set) Item 04: RR wheel speed sensor
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 9.
|
|
|
|
|
|
Go to Step 4.
|
|
|
|
|
|
STEP 4. Harness and connector check
|
|
|
(1)Check the wheel speed sensor (FL, FR, RL or RR).
|
|
|
(2)Check the ABS-ECU connector.
|
|
|
(3)Check the wiring harness and connector between the ABS-ECU connector and the wheel speed sensor (FL, FR, RL or RR).
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Repair the defective connector or the wiring harness. Then go to Step 10.
|
|
|
|
|
|
STEP 5. Check for wheel speed sensor installation
|
|
|
Refer to .
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 6.
|
|
|
|
|
|
Repair the wheel speed sensor. (Refer to .) Then go to Step 10.
|
|
|
|
|
|
STEP 6. Check for wheel speed sensor as a single unit
|
|
|
Refer to .
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Replace the wheel speed sensor (Refer to ). Then go to Step 10.
|
|
|
|
|
|
STEP 7. Check for rotor (for wheel speed detection) installation
|
|
|
<Front>
- Refer to GROUP 26 - Front Axle Hub Assembly Removal and Installation .
|
|
|
<Rear>
- Refer to GROUP 27 - Axle Shaft Assembly Disassembly and Reassembly .
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 8.
|
|
|
|
|
|
Replace the rotor (for wheel speed detection). Then go to Step 10.
|
|
|
|
|
|
STEP 8. Front axle hub assembly and wheel bearing or axle shaft bearing check
|
|
|
- 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 ).
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 9.
|
|
|
|
|
|
Replace the front axle hub assembly or wheel bearing or axle shaft bearing. Then go to Step 10.
|
|
|
|
|
|
STEP 9. Check whether the diagnosis code is set again.
|
|
|
(1)Turn the ignition switch to the "ON" position.
|
|
|
(2)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
(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.
|
|
|
|
(4)Erase the diagnosis code.
|
|
|
Q.
Is diagnosis code No. C101F, C1014, C1035 or C102A set?
|
|
|
Replace the hydraulic unit assembly (integrated with ABS-ECU) (Refer to ). Then go to Step 10.
|
|
|
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).
|
|
|
|
|
|
STEP 10. Check whether the diagnosis code is set again.
|
|
|
(1)Turn the ignition switch to the "ON" position.
|
|
|
(2)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
(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.
|
|
|
|
(4)Erase the diagnosis code.
|
|
|
Q.
Is diagnosis code No. C101F, C1014, C1035 or C102A set?
|
|
|
Return to Step 1.
|
|
|
|
|
|
This diagnosis is complete.
|
|
|
|