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 54F, CAN bus-line diagnostic flow

OPERATION

Wheel speed sensor is a kind of a pulse alternator. It consists of encoders (a plate on which north and south pole sides of the magnets are arranged alternately) for detecting wheel speed which rotates at the same speed of the wheels and speed sensors. This sensor outputs frequency pulse signals in proportion to wheel speed.
The wheel speed sensors transmit the frequency of the voltage pulses and the amount of voltage generated by each pulse to the ABS-ECU.

DIAGNOSIS CODE SET CONDITIONS

Diagnosis codes No.C1200, C1205, 1210 and 1215 are set when signal is not input due to breakage of the wires 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 hydraulic unit (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 54F, 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 01 (Code No.C1200 is set): Front right wheel speed sensor
Item 02 (Code No.C1205 is set): Front left wheel speed sensor
Item 03 (Code No.C1210 is set): Rear right wheel speed sensor
Item 04 (Code No.C1215 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. Voltage measurement at ABS-ECU connector A-03.

(1)Disconnect the connector A-03, and connect special tool ABS Check Harness (MB991974) to the wiring harness-side connector.

note

Do not connect special tool ABS Check Harness (MB991974) to the ABS-ECU.

(2)Turn the ignition switch to the "ON" position.
(3)Measure the voltage between the relevant signal and earth terminals in the wheel speed sensor circuit and body earth.
OK: less than 1V or less

Code No.C1200 is set: Between signal terminal 5 and body earth, and between earth terminal 6 and body earth
Code No.C1205 is set: Between signal terminal 8 and body earth, and between earth terminal 9 and body earth
Code No.C1210 is set: Between signal terminal 11 and body earth, and between earth terminal 12 and body earth
Code No.C1215 is set: Between signal terminal 2 and body earth, and between earth terminal 3 and body earth

Q. Is the check result normal?

Go to Step 5.

NO (When the voltage between terminal 5 or 6 - and body earth measures more than 1 V)

: Go to Step 6.

NO (When the voltage between terminal 8 or 9 - and body earth measures more than 1 V)

: Go to Step 8.

NO (When the voltage between terminal 11 or 12 - and body earth measures more than 1 V)

: Go to Step 10.

NO (When the voltage between terminal 2 or 3 - and body earth measures more than 1 V)

: Go to Step 12.

STEP 5. Resistance measurement at ABS-ECU connector A-03.

(1)Disconnect the connector A-03, and connect special tool ABS Check Harness (MB991974) to the wiring harness-side connector.

note

Do not connect special tool ABS Check Harness (MB991974) to the ABS-ECU.

(2)Measure the resistance between the relevant signal and earth terminals in the wheel speed sensor circuit and body earth.
OK: No continuity

Code No.C1200 is set: Between signal terminal 5 and body earth, and between earth terminal 6 and body earth
Code No.C1205 is set: Between signal terminal 8 and body earth, and between earth terminal 9 and body earth
Code No.C1210 is set: Between signal terminal 11 and body earth, and between earth terminal 12 and body earth
Code No.C1215 is set: Between signal terminal 2 and body earth, and between earth terminal 3 and body earth

Q. Is the check result normal?

Go to Step 14.

NO (Continuity exists between terminal 5 or terminal 6 and body earth)

: Go to Step 6.

NO (Continuity exists between terminal 8 or terminal 9 and body earth)

: Go to Step 8.

NO (Continuity exists between terminal 11 or terminal 12 and body earth)

: Go to Step 10.

NO (Continuity exists between terminal 2 or terminal 3 and body earth)

: Go to Step 12.

STEP 6. Check ABS-ECU connector A-03 and wheel speed sensor <front: RH> connector A-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?

Go to Step 7.

Repair or replace the damaged component(s). Then go to Step 16.

STEP 7. Check the harness wires between ABS-ECU connector A-03 (terminal 5, 6) and wheel speed sensor <front: RH> connector A-02 (terminal 1, 2).

Q. Is the check result normal?

Go to Step 14.

Repair the wiring harness. Then go to Step 16.

STEP 8. Check ABS-ECU connector A-03 and wheel speed sensor <front: LH> connector A-05 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 16.

STEP 9. Check the harness wires between ABS-ECU connector A-03 (terminal 8, 9) and wheel speed sensor <front: LH> connector A-05 (terminal 2, 1).

Q. Is the check result normal?

Go to Step 14.

Repair the wiring harness. Then go to Step 16.

STEP 10. Check ABS-ECU connector A-03, intermediate connector C-16, C-124, D-28 and wheel speed sensor <rear: RH> connector D-06 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?

Go to Step 11.

Repair or replace the damaged component(s). Then go to Step 16.

STEP 11. Check the harness wires between ABS-ECU connector A-03 (terminal 11, 12) and wheel speed sensor <rear: RH> connector D-06 (terminal 1, 2).

Q. Is the check result normal?

Go to Step 14.

Repair the wiring harness. Then go to Step 16.

STEP 12. Check ABS-ECU connector A-03, intermediate connector C-16, C-124, D-28 and wheel speed sensor <rear: LH> connector D-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?

Go to Step 13.

Repair or replace the damaged component(s). Then go to Step 16.

STEP 13. Check the harness wires between ABS-ECU connector A-03 (terminal 2, 3) and wheel speed sensor <rear: LH> connector D-14 (terminal 2, 1).

Q. Is the check result normal?

Go to Step 14.

Repair the wiring harness. Then go to Step 16.

STEP 14. 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?

	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 .

	Replace the wheel speed sensor. Then go to Step 15.

STEP 15. 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 (integrated with ABS-ECU). Then go to Step 16.

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 16. Check whether the diagnosis code is reset.

Q. Is code No.C1200, C1205, C1210 or C1215 set?

Repeat the troubleshooting from Step 1.

The procedure is complete.