DTC

C0031:23, C0031:27

LF ABS wheel-speed sensor/ABS sensor rotor

C0034:23, C0034:27

RF ABS wheel-speed sensor/ABS sensor rotor

C0037:23, C0037:27, C0037:62

LR ABS wheel-speed sensor/ABS sensor rotor

C003A:23, C003A:27, C003A:62

RR ABS wheel-speed sensor/ABS sensor rotor

DETECTION CONDITION

• C0031:23, C0034:23, C0037:23, C003A:23

• The wheel-speed signal is not input from any of the four wheels when the vehicle goes from start to a speed of 10 km/h {6.2 mph} or more

• While the vehicle is traveling, no signal in any of four wheels is detected for a continuous 30 s.

• C0031:27, C0034:27, C0037:27, C003A:27

• Periodic abnormality is detected in the signal wave pattern from the ABS wheel-speed sensors.

• ABS control continues to operate for 45 s or more.

• C0037:62, C003A:62

• The following condition is detected 8 times continuously (One detection period is when ignition is switched from ON to off)

• While the vehicle is traveling at a speed of 20 km/h {12 mph} or more, the wheel speed signal from the rear wheels is not input to the DSC HU/CM for a continuous 20 s.

FAIL-SAFE FUNCTION

• C0031:23, C0031:27, C0034:23, C0034:27, C0037:23, C0037:27, C003A:23, C003A:27

• Illuminates the ABS warning light, TCS/DSC indicator light, and master warning light*¹.

• Tire pressure monitoring system warning light illuminates after flashes.

• Inhibits the ABS, brake assist control, TCS, Hill Launch Assist (HLA), vehicle roll prevention function*², DSC, Mazda Radar Cruise Control (MRCC)*², Smart City Brake Support (SCBS)*², and TPMS controls (Additionally, when any malfunction is detected in one or two rear wheels, EBD control is inhibited and the brake system warning light is illuminated.).

• C0037:62, C003A:62

• Illuminates the ABS warning light, brake system warning light, TCS/DSC indicator light, and master warning light*¹.

• Tire pressure monitoring system warning light illuminates after flashes.

• Inhibits all controls.

*¹: Vehicles with Smart City Brake Support (SCBS).

*²: If equipped.

POSSIBLE CAUSE

• ABS wheel-speed sensor malfunction

• ABS sensor rotor malfunction (missing ABS sensor rotor teeth due to foreign material obstruction)

• Excessive clearance between the ABS wheel-speed sensor and sensor rotor

• ABS wheel-speed sensor or ABS sensor rotor installation malfunction (If the ABS sensor rotor is installed at an angle, it may cause output of abnormal wave pattern at high speeds)

• DSC HU/CM internal damage (Solenoid valve malfunction, pump motor malfunction, or pipe clogging)

• Continuous ABS operation

STEP

INSPECTION

ACTION

1

• Switch the ignition off.

• Connect the M-MDS to the DLC-2.

• Select the following PIDs using the M-MDS:

• WSPD_SEN_LF

• WSPD_SEN_LR

• WSPD_SEN_RF

• WSPD_SEN_RR

• Drive the vehicle.

• Verify that the vehicle speeds detected by the four ABS wheel-speed sensors are approximately the same.

• Are the vehicle speeds approximately the same?

Yes

Go to Step 3.

No

Go to the next step.

2

• Disconnect the ABS wheel-speed sensor connectors.

• Inspect for no continuity between the following ABS wheel-speed sensor connector terminals (vehicle harness-side) and body ground:

• ABS wheel-speed sensor (RF): A—Body ground

• ABS wheel-speed sensor (LF): A—Body ground

• ABS wheel-speed sensor (RR): A—Body ground

• ABS wheel-speed sensor (LR): A—Body ground

• Is the continuity normal?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the DSC HU/CM connector terminals (vehicle harness-side) and the following vehicle harness-side connector terminals of the ABS wheel-speed sensors:

• RF ABS wheel-speed sensor(-): O—A

• LF ABS wheel-speed sensor(-): P—A

• RR ABS wheel-speed sensor(-): J—A

• LR ABS wheel-speed sensor(-): I—A

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to Step 5.

3

• Inspect the clearance between the ABS wheel-speed sensor and the ABS sensor rotor.

  (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.)

  (See REAR ABS WHEEL-SPEED SENSOR INSPECTION.)

• Is the clearance normal?

Yes

Go to the next step.

No

Replace the ABS wheel-speed sensor, then go to step 5.

(See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)

(See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)

4

• Is the result normal?

Yes

Go to the next step.

No

Replace the wheel hub component, then go to next step.

(See WHEEL HUB, STEERING KNUCKLE REMOVAL/INSTALLATION.)

(See WHEEL HUB COMPONENT REMOVAL/INSTALLATION.)

5

• Reconnect all disconnected connectors.

• Clear the DTCs from the memory.

  (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

• Start the engine and drive the vehicle at 20 km/h {12 mph} or more.

• Are the same DTCs present?

Yes

Repeat the inspection from Step 1.

If the malfunction recurs, replace the DSC HU/CM, then go to the next step.

(See DSC HU/CM REMOVAL/INSTALLATION.)

No

Go to the next step.

6

• Are any other DTCs output?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

No

DTC troubleshooting completed.