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
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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
).
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- The wheel speed sensor is a kind of a pulse generator.
It consists of encoders (a plate on which north and south pole sides of
the magnets are arranged
alternately) for detecting the wheel speed which rotates at the same
speed of the wheels and
wheel speed sensors. This sensor outputs frequency pulse signals in
proportion to the wheel
speed.
- The pulse signals, which the wheel speed sensor creates, are sent to
ABS-ECU. ABS-ECU
uses the frequency of the pulse signals to determine the wheel
speed.
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DIAGNOSIS CODE SET CONDITIONS
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This diagnosis code is set if any malfunction
below is found:
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- When the brake fluid pressure is decreased for a long time.
- When the brake fluid pressure is held for a long time.
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- Damaged wiring harness and connectors
- External noise interference
- Malfunction of wheel speed sensor
- ABS-ECU malfunction
- Excessive gap between the wheel speed sensor and the magnetic encoder
for wheel
speed detection
- Adhesion of foreign materials on the wheel speed sensor
- Adhesion of foreign materials on the magnetic encoder for wheel speed
detection
- Wheel bearing malfunction
- Improper installation of the wheel speed sensor
- Deformation of the magnetic encoder for wheel speed detection
- Disturbance of magnetization pattern for magnetic encoder for wheel
speed detection
- Missing teeth of the magnetic encoder for wheel speed
detection
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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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Q.
Is the diagnosis code No.C1046, 1047, 1048 or 1049 set?
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Go to Step 3.
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This
diagnosis is complete.
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STEP 3. M.U.T.-III diagnosis code
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Code No.C1046 is set
- Check that the diagnosis codes No.C100A, C1011, C1014, and C1041 are
also set.
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Code No.C1047 is set
- Check that the diagnosis codes No.C1015, C101C, C101F, and C1042 are
also set.
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Code No.C1048 is set
- Check that the diagnosis codes No.C1020, C1027, C102A, and C1043 are
also set.
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Code No.C1049 is set
- Check that the diagnosis codes No.C102B, C1032, C1035, and C1044 are
also set.
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Q.
Are the diagnosis codes set?
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Carry
out the diagnosis for the relevant diagnosis codes.
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Go to Step 4.
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STEP 4. M.U.T.-III data list
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Check the following data list (Refer to ).
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- Item No.01: FL wheel speed sensor
- Item No.02: FR wheel speed sensor
- Item No.03: RL wheel speed sensor
- Item No.04: 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 5.
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STEP 5. Check the wiring harness between the ABS-ECU connector terminal
and the wheel speed sensor connector terminal
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Code No.C1046 is set
- Check of short to power supply, short to earth, and open circuit in
FL+,
FL- line between ABS-ECU connector and front wheel speed sensor
(LH) connector.
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Code No.C1047 is set
- Check of short to power supply, short to earth, and open circuit in
FR+,
FR- line between ABS-ECU connector and front wheel speed sensor
(RH) connector.
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Code No.C1048 is set
- Check of short to power supply, short to earth, and open circuit in
RL+,
RL- line between ABS-ECU connector and rear wheel speed sensor (LH)
connector.
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Code No.C1049 is set
- Check of short to power supply, short to earth, and open circuit in
RR+,
RR- line between ABS-ECU connector and rear wheel speed sensor (RH)
connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or wiring
harness. Then go to Step 12.
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STEP 6. Check for wheel speed sensor installation
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Check how the wheel speed sensor is installed
(Disconnection of wheel speed sensor, loose
mounting bolt, etc.).
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Q.
Is the check result normal?
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Go to Step 7.
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Reinstall the wheel speed sensor
correctly (Refer to <front>
or <rear>). Then go to
Step 7.
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STEP 7. Check for wheel speed sensor output current
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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 <front>
or <rear>). Then go to
Step 11.
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STEP 8. Check for wheel bearing looseness
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note |
Loose wheel bearing may increase the gap between
the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel bearing for looseness.
<Refer to GROUP 26 - Wheel
Bearing Axial Play Check . (front), GROUP 27A -
Wheel
Bearing Axial Play Check (rear-2WD) or GROUP 27B
- Wheel
Bearing Axial Play Check (rear-4WD)>
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Q.
Is the check result normal?
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Go to Step 9.
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Replace the wheel bearing
<front> or rear wheel hub assembly <rear>. <Refer
to GROUP 26 - Front Axle Hub Assembly (front),
GROUP 27A - Rear Axle Hub Assembly (rear-2WD) or GROUP 27B -
Rear
Axle Hub Assembly (rear-4WD)> Then go to Step
12.
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STEP 9. Check of wheel speed detection encoder
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![](../../../img/35/AC504925AD00ENG.png)
![](../../../img/35/AC808708AC00ENG.png)
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Check the encoder for adhesion of foreign
materials or deformation.
Q.
Is the check result normal?
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
<front> or rear wheel hub assembly <rear>. <Refer
to GROUP 26 - Front Axle Hub Assembly (front), GROUP
27A - Rear Axle Hub Assembly (rear-2WD) or GROUP 27B -
Rear
Axle Hub Assembly (rear-4WD)> Then go to Step
12.
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STEP 10. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or higher.
note |
The ABS warning lamp does not turn OFF in some cases
unless the vehicle runs at 20 km/h
or higher.
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Q.
Is the diagnosis code No.C1046, 1047, 1048 or 1049 set?
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Replace the wheel speed sensor
(Refer to <front>
or <rear>). Then go to
Step 11.
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Intermittent malfunction (Refer to
GROUP 00 - How to Use Troubleshooting/How
to Cope with Intermittent Malfunctions ).
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STEP 11. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or higher.
note |
The ABS warning lamp does not turn OFF in some cases
unless the vehicle runs at 20 km/h
or higher.
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Q.
Is the diagnosis code No.C1046, 1047, 1048 or 1049 set?
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Replace the hydraulic unit
(integrated with ABS-ECU) (Refer to ). Then
go to Step 12.
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This
diagnosis is complete.
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STEP 12. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or higher.
note |
The ABS warning lamp does not turn OFF in some cases
unless the vehicle runs at 20 km/h
or higher.
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Q.
Is the diagnosis code No.C1046, 1047, 1048 or 1049 set?
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Return to Step 1.
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This
diagnosis is complete.
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