Code No.C1200: Front Right Wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.C1205: Front Left Wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.C1210: Rear Right Wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.C1215: Rear Left Wheel Speed Sensor (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 54C, CAN bus-line diagnostic flow ).

OPERATION



  • A toothed ABS rotor generates a voltage pulse 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 ABS rotor teeth and the wheel speed sensor, and by the speed of rotation.
  • The wheel speed sensors transmit the frequency of the voltage pulses and the amount of voltage generated by each pulse to the ABS-ECU.
  • The hydraulic unit assembly (integrated with ABS-ECU) modulates the amount of braking force individually applied to each wheel cylinder.

DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES




  • Malfunction of the wheel speed sensor
  • Damaged wiring harness or connector
  • Malfunction of the hydraulic unit assembly (integrated with ABS-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 54C, 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.C1200, C1205, C1210 or C1215 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.C1205 is set): Front left wheel speed sensor
  • Item 2 (Code No.C1200 is set): Front right wheel speed sensor
  • Item 3 (Code No.C1215 is set): Rear left wheel speed sensor
  • Item 4 (Code No.C1210 is set): Rear right 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 ABS-ECU connector A-01.

(1)Disconnect the connector A-01, and connect special tool ABS check harness (MB991952) to the wiring harness-side connector.
note Do not connect special tool ABS check harness (MB991952) to the ABS-ECU.
(2)Measure the resistance between the ABS-ECU connector terminals.
Standard Value: 0.9 - 1.3 kΩ

  • Code No.C1200 is set: Between terminal 26 and 27
  • Code No.C1205 is set: Between terminal 4 and 5
  • Code No.C1210 is set: Between terminal 24 and 23
  • Code No.C1215 is set: Between terminal 1 and 2

Q. Is the resistance between terminals 26 and 27, 4 and 5, 1 and 2, or 24 and 23 within the standard value?

When resistances between all terminals are within the standard value. : Go to Step 14.

When resistance between terminals 26 and 27 is not within the standard value. : Go to Step 5.

When resistance between terminals 4 and 5 is not within the standard value. : Go to Step 6.

When resistance between terminals 24 and 23 is not within the standard value. : Go to Step 7.

When resistance between terminals 1 and 2 is not within the standard value. : Go to Step 8.

STEP 5. Check ABS-ECU connector A-01 and wheel speed sensor <front: RH> connector A-125 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 15.

STEP 6. Check ABS-ECU connector A-01 and wheel speed sensor <front: LH> connector A-119 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 15.

STEP 7. Check ABS-ECU connector A-01, intermediate connector C-29, F-12 and wheel speed sensor <rear: RH> connector F-10 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 15.

STEP 8. Check ABS-ECU connector A-01, intermediate connector C-29, F-12 and wheel speed sensor <rear: LH> connector F-11 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.C1200 is set: Front right wheel speed sensor
  • When code No.C1205 is set: Front left wheel speed sensor
  • When code No.C1210 is set: Rear right wheel speed sensor
  • When code No.C1215 is set: Rear left wheel speed sensor

Q. Is the check result normal?
Go to Step 14.
NO <Front right wheel speed sensor> : Go to Step 10.
NO <Front left wheel speed sensor> : Go to Step 11.
NO <Rear right wheel speed sensor> : Go to Step 12.
NO <Rear left wheel speed sensor> : Go to Step 13.

STEP 10. Check the harness wires between ABS-ECU connector A-01 (terminal 27, 26) and wheel speed sensor <front: RH> connector A-125 (terminal 2, 1).


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 ABS-ECU connector A-01 (terminal 4, 5) and wheel speed sensor <front: LH> connector A-119 (terminal 2, 1).


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 ABS-ECU connector A-01 (terminal 23, 24) and wheel speed sensor <rear: RH> connector F-10 (terminal 1, 2).



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 ABS-ECU connector A-01 (terminal 1, 2) and wheel speed sensor <rear: LH> connector F-11 (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.C1200, C1205, C1210 or C1215 set?

Replace the hydraulic unit assembly (integrated with ABS-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.C1200, C1205, C1210 or C1215 set?

Repeat the troubleshooting from Step 1.

The procedure is complete.