Code No.11, 12, 13, 14: Wheel Speed Sensor (FR, FL, RR, RL) Open Circuit
or Short Circuit
caution |
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Diagnose the CAN bus lines before the
diagnosis codes (Refer to GROUP 54D, CAN bus-line diagnostic flow ).
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<L.H.drive vehicles>
<R.H.drive
vehicles>
OPERATION
- A toothed rotor generates a voltage signal as it moves across the pickup
field of each wheel speed sensor.
- The amount of voltage generated at each wheel is determined by the
clearance between the rotor teeth and the wheel speed sensor, and by the
speed of rotation.
- The wheel speed sensors transmit the frequency of the voltage signal to
the Active stability and traction control system-electronic control unit
(ASTC-ECU).
- The ABS hydraulic unit modulates the amount of braking force individually
applied to each wheel cylinder.
DIAGNOSIS CODE SET CONDITIONS
Diagnosis codes No.11, 12, 13 and 14
are set when sensor impedance is varies due to breakage of the wiring harness,
connectors or coil of the four wheel speed sensors.
PROBABLE CAUSES
The most likely causes for these diagnosis codes
to set are:
- Malfunction of the wheel speed sensor
- Damaged wiring harness or connector
- Malfunction of the ASTC-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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caution |
Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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(1)Connect M.U.T.-III to the 16-pin diagnosis
connector.
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(2)Turn the ignition switch to the "ON" position.
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(3)Diagnose the CAN bus line.
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(4)Turn the ignition switch to the "LOCK" (OFF)
position.
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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 54D, CAN bus line Diagnostic flow ). Then go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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caution |
Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF)
position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Is code No.11, 12, 13 or 14 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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(1)
caution |
Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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Connect M.U.T.-III to the 16-pin diagnosis connector.
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(3)Set M.U.T.-III to the data reading mode, and check the
data list items by driving the vehicle.
- When code No.11 is set: Wheel speed sensor (FR)
- When code No.12 is set: Wheel speed sensor (FL)
- When code No.13 is set: Wheel speed sensor (RR)
- When code No.14 is set: Wheel speed sensor (RL)
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(4)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Does the speedometer indication match the M.U.T.-III indication?
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It can
be assumed that this malfunction is intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunction .
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Go to Step 4.
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STEP 4. Resistance measurement at ASTC-ECU connector D-232 and
D-233.
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(1)Disconnect the connector D-233 and D-232.
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(2)Measure the resistance between the ASTC-ECU connector
terminals.
- Code No.11 is set: Between the connector D-233 terminal 27 and
28
- Code No.12 is set: Between the connector D-233 terminal 30 and
31
- Code No.13 is set: Between the connector D-232 terminal 60 and
61
- Code No.14 is set: Between the connector D-232 terminal 46 and
47
Standard Value: 1.0 - 1.5 kΩ
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Q.
Is the check result normal?
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Go to Step 14.
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NO (When resistance between the connector D-233
terminals 27 and 28 is not within the standard value.) : Go to Step 5.
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NO (When resistance between the connector D-233
terminals 30 and 31 is not within the standard value.) : Go to Step 6.
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NO (When resistance between the connector D-232
terminals 60 and 61 is not within the standard value.) : Go to Step 7.
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NO (When resistance between the connector D-232
terminals 46 and 47 is not within the standard value.) : Go to Step 8.
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STEP 5. Check ASTC-ECU connector D-233, intermediate connector A-03
(L.H.drive vehicles), intermediate connector D-137 (R.H.drive vehicles)
and wheel speed sensor (FR) connector A-36 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair or replace the damaged
component(s). Then go to Step 14.
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STEP 6. Check ASTC-ECU connector D-233, intermediate connector A-03
(L.H.drive vehicles), intermediate connector D-137 (R.H.drive vehicles)
and wheel speed sensor (FL) connector A-28 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair or replace the damaged
component(s). Then go to Step 14.
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STEP 7. Check ASTC-ECU connector D-232, intermediate connector D-219,
D-231 and wheel speed sensor (RR) connector E-27 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair or replace the damaged
component(s). Then go to Step 14.
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STEP 8. Check ASTC-ECU connector D-232, intermediate connector D-219,
D-231 and wheel speed sensor (RL) connector E-19 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair or replace the damaged
component(s). Then go to Step 14.
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STEP 9. Inspect the wheel speed sensor.
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Check the wheel speed sensor relevant to the
diagnosis code. For the applicable inspection procedure, refer to .
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- When code No.11 is set: Wheel speed sensor (FR)
- When code No.12 is set: Wheel speed sensor (FL)
- When code No.13 is set: Wheel speed sensor (RR)
- When code No.14 is set: Wheel speed sensor (RL)
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Q.
Is the check result normal?
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Go to Step 14.
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NO <wheel speed sensor (FR)> : Go to Step
10.
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NO <wheel speed sensor (FL)> : Go to Step
11.
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NO <wheel speed sensor (RR)> : Go to Step
12.
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NO <wheel speed sensor (RL)> : Go to Step
13.
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STEP 10. Check the harness wires between ASTC-ECU connector D-233
(terminal 27, 28) and wheel speed sensor (FR) connector A-36 (terminal 1,
2).
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Q.
Is the check result normal?
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Go to Step 14.
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Repair the wiring harness. Then
go to Step 15.
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STEP 11. Check the harness wires between ASTC-ECU connector D-233
(terminal 30, 31) and wheel speed sensor (FL) connector A-28 (terminal 1,
2).
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Q.
Is the check result normal?
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Go to Step 14.
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Repair the wiring harness. Then
go to Step 15.
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STEP 12. Check the harness wires between ASTC-ECU connector D-232
(terminal 60, 61) and wheel speed sensor (RR) connector E-27 (terminal 2,
1).
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Q.
Is the check result normal?
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Go to Step 14.
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Repair the wiring harness. Then
go to Step 15.
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STEP 13. Check the harness wires between ASTC-ECU connector D-232
(terminal 46, 47) and wheel speed sensor (RL) connector E-19 (terminal 2,
1).
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Q.
Is the check result normal?
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Go to Step 14.
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Repair the wiring harness. Then
go to Step 15.
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STEP 14. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is
set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF)
position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is reset.
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(6)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Is code No.11, 12, 13 or 14 set?
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Replace the ASTC-ECU. Then go to
Step 15.
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It can
be assumed that this malfunction is intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunction .
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STEP 15. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF)
position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Is code No.11, 12, 13 or 14 set?
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Repeat the troubleshooting from
Step 1.
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The
procedure is complete.
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