Code No. C1046:
FL wheel speed sensor phase
Code No. C1047: FR wheel speed sensor phase
Code
No. C1048: RL wheel speed sensor phase
Code No. C1049: RR wheel speed sensor phase
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.
- When the hydraulic unit (integrated with ASTC-ECU) is replaced, always carry out
the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to
).
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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 ASTC-ECU.
- The hydraulic unit assembly (integrated with ASTC-ECU) modulates the amount of braking force
individually applied to each wheel cylinder.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is found:
- When the ABS control is operated for a long time.
PROBABLE CAUSES
Current trouble
- Driving conditions which require the ABS control continuously.
- Adhesion of foreign materials on the wheel speed sensor
- Adhesion of foreign materials on the rotor (for wheel speed detection)
- Excessive gap between the wheel speed sensor and the rotor (for wheel speed detection)
- Malfunction of the wheel speed sensor installation
- Malfunction of the rotor (for wheel speed detection) installation
- Malfunction of the front axle hub assembly
- Malfunction of the wheel bearing
- Malfunction of the Axle shaft bearing
- Teeth lack or clogging of the rotor (for wheel speed detection)
- 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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caution |
When the vehicle is driven on the road which requires the ABS
control frequently, this diagnosis code may be set. Therefore, prior to the diagnosis, you have
to ask your customer how and when the malfunction has occurred.
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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 lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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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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(4)Erase the diagnosis code.
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Q.
Is diagnosis code No. C1046, C1047, C1048 or C1049 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. C1046 is set) Item 12: FL wheel speed sensor
- (When code No. C1047 is set) Item 13: FR wheel speed sensor
- (When code No. C1048 is set) Item 14: RL wheel speed sensor
- (When code No. C1049 is set) Item 15: RR wheel speed sensor
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 4.
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STEP 4. Harness and connector check
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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 11.
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STEP 5. rotor (for wheel speed detection) check
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Check the rotor (for wheel speed detection) (Refer to GROUP 35B, Wheel Speed Sensor - Inspection ).
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the rotor (for wheel speed detection). Then go to Step 11.
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STEP 6. Check for wheel speed sensor installation
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Refer to GROUP 35B, Wheel Speed Sensor - Removal and Installation .
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the wheel speed sensor. (Refer to .) Then
go to Step 11.
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STEP 7. 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 8.
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Replace the wheel speed sensor (Refer to ).
Then go to Step 11.
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STEP 8. Check for rotor (for wheel speed detection) installation
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<Front>
- Refer to GROUP 26 - Front Axle Hub Assembly Disassembly and Reassembly
<2WD-Except
High Rider>.
- Refer to GROUP 26 - Front Axle Hub Assembly Removal and Installation
<High
Rider>.
- 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 9.
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Replace the rotor (for wheel speed detection). Then go to Step 11.
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STEP 9. 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
<2WD-Except High Rider>, <High
Rider, 4WD>).
- Check the wheel bearing (Refer to GROUP 26, On-vehicles service
).
- Check the axle shaft bearing (Refer to GROUP 27, On-vehicles service
).
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Q.
Is the check result normal?
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Go to Step 10.
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Replace the front axle hub assembly or wheel bearing or axle shaft bearing. Then
go to Step 11.
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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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(4)Erase the diagnosis code.
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Q.
Is diagnosis code No. C1046, C1047, C1048 or C1049 set?
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Replace the hydraulic unit (integrated with ASTC-ECU) (Refer to ). Then
go to Step 11.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
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STEP 11. 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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(4)Erase the diagnosis code.
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Q.
Is diagnosis code No. C1046, C1047, C1048 or C1049 set?
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Return to Step 1.
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This diagnosis is complete.
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