Code No.11: Wheel Speed Sensor (FR) Open or Short Circuit
Code No.12: Wheel Speed Sensor (FL) Open or Short Circuit
Code No.13: Wheel Speed Sensor (RR) Open or Short Circuit
Code No.14: Wheel Speed Sensor (RL) Open or Short Circuit


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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 ).

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

DIAGNOSIS

STEP 1. M.U.T.-III CAN bus diagnostics
caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
(1)Connect M.U.T.-III to the 16-pin diagnosis connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54D, CAN bus line Diagnostic flow ). Then go to Step 2.

STEP 2. Check whether the diagnosis code is reset.
caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.11, 12, 13 or 14 set?
Go to Step 3.
The procedure is complete.

STEP 3. M.U.T.-III data list
(1)
caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
Connect M.U.T.-III to the 16-pin diagnosis connector.
(2)Start the engine.
(3)Set M.U.T.-III to the data reading mode, and check the data list items by driving the vehicle.

  • Item 1 (Code No.11 is set): Front right wheel speed sensor
  • Item 2 (Code No.12 is set): Front left wheel speed sensor
  • Item 3 (Code No.13 is set): Rear right wheel speed sensor
  • Item 4 (Code No.14 is set): Rear left wheel speed sensor
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Does the speedometer indication match the M.U.T.-III indication?
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 .
Go to Step 4.

STEP 4. Resistance measurement at ASTC-ECU connector D-232 and D-233.
(1)Disconnect the connector D-233 and D-232.
(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

Q. Is the check result normal?
Go to Step 14.
NO (When resistance between the connector D-233 terminals 27 and 28 is not within the standard value.) : Go to Step 5.
NO (When resistance between the connector D-233 terminals 30 and 31 is not within the standard value.) : Go to Step 6.
NO <When resistance between the connector D-232 terminals 60 and 61 is not within the standard value.> : Go to Step 7.
NO <When resistance between the connector D-232 terminals 46 and 47 is not within the standard value.> : Go to Step 8.

STEP 5. Check ASTC-ECU connector D-233, intermediate connector A-03 and wheel speed sensor front: RH connector A-36 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?
Go to Step 9.
Repair or replace the damaged component(s). Then go to Step 14.

STEP 6. Check ASTC-ECU connector D-233, intermediate connector A-03 and wheel speed sensor front: LH connector A-28 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?
Go to Step 9.
Repair or replace the damaged component(s). Then go to Step 14.

STEP 7. Check ASTC-ECU connector D-232, intermediate connector D-219, D-231 and wheel speed sensor rear: RH connector E-27 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?
Go to Step 9.
Repair or replace the damaged component(s). Then go to Step 14.

STEP 8. Check ASTC-ECU connector D-232, intermediate connector D-219, D-231 and wheel speed sensor rear: LH connector E-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?
Go to Step 9.
Repair or replace the damaged component(s). Then go to Step 14.

STEP 9. Inspect the wheel speed sensor.
Check the wheel speed sensor relevant to the diagnosis code. For the applicable inspection procedure, refer to .

  • When code No.11 is set: Front right wheel speed sensor
  • When code No.12 is set: Front left wheel speed sensor
  • When code No.13 is set: Rear right wheel speed sensor
  • When code No.14 is set: Rear left wheel speed sensor

Q. Is the check result normal?
YES <Front right wheel speed sensor> : Go to Step 10.
YES <Front left wheel speed sensor> : Go to Step 11.
YES <Rear right wheel speed sensor> : Go to Step 12.
YES <Rear left wheel speed sensor> : Go to Step 13.
Go to Step 14.

STEP 10. Check the harness wires between ASTC-ECU connector D-233 (terminal 27, 28) and wheel speed sensor front: RH connector A-36 (terminal 1, 2).

Q. Is the check result normal?
Go to Step 14.
Repair the wiring harness. Then go to Step 15.

STEP 11. Check the harness wires between ASTC-ECU connector D-233 (terminal 30, 31) and wheel speed sensor front: LH connector A-28 (terminal 1, 2).

Q. Is the check result normal?
Go to Step 14.
Repair the wiring harness. Then go to Step 15.

STEP 12. Check the harness wires between ASTC-ECU connector D-232 (terminal 60, 61) and wheel speed sensor rear: RH connector E-27 (terminal 2, 1).

Q. Is the check result normal?
Go to Step 14.
Repair the wiring harness. Then go to Step 15.

STEP 13. Check the harness wires between ASTC-ECU connector D-232 (terminal 46, 47) and wheel speed sensor rear: LH connector E-19 (terminal 2, 1).

Q. Is the check result normal?
Go to Step 14.
Repair the wiring harness. Then go to Step 15.

STEP 14. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is reset.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.11, 12, 13 or 14 set?
Replace the ASTC-ECU. Then go to Step 15.
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 .

STEP 15. Check whether the diagnosis code is reset.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.11, 12, 13 or 14 set?
Repeat the troubleshooting from Step 1.
The procedure is complete.