Code No. C1041
FL wheel speed tone performance
Code No. C1042 FR wheel speed tone
performance
Code
No. C1043 RL wheel speed tone performance
Code No. C1044 RR wheel speed
tone performance
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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
).
- Whenever ECU is replaced, ensure that the CAN bus lines are
normal.
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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
ASC-ECU. ASC-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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ASC-ECU monitors the signals from each wheel
speed sensor while the vehicle is being driven.
If any periodical drop is found in these sensor signals, ASC-ECU will set
the relevant diagnosis
code.
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- Wheel bearing malfunction
- Deformation of the wheel speed detection encoder
- Adhesion of foreign materials on the wheel speed detection
encoder
- ASC-ECU malfunction
- The number of poles on the Magnetic encoder for wheel speed detection
(N-pole and
S-pole) is changed
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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.C1041, 1042, 1043 or 1044 set?
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Go to Step 3
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This
diagnosis is complete.
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STEP 3. 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 4
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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 6.
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STEP 4. 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 5
NO (Adhesion
of foreign materials) : Remove the foreign materials
and clean the encoder so as not to disturb the magnetisation
pattern on it while taking care of the magnet, magnetic substance, and
magnetic attraction.
Then go to Step 6.
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 6.
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STEP 5. 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 diagnosis code No. C1041, 1042, 1043 or 1044 set?
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Replace the hydraulic unit
(integrated with ASC-ECU) (Refer to ).
Then go to Step 6.
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This
diagnosis is complete.
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STEP 6. 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 diagnosis code No. C1041, 1042, 1043 or 1044 set?
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Return to Step 1.
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This
diagnosis is complete.
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