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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC C1A95:64 [DSC HU/CM]

DTC	C1A95:64	ABS wheel-speed sensor
DETECTION CONDITION		ABS wheel-speed sensor or sensor rotor malfunction is detected.
FAIL-SAFE FUNCTION		Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
POSSIBLE CAUSE		Tires of different diameters between front and rear wheels are installed ABS sensor rotor malfunction (missing sensor rotor teeth) Excessive clearance between ABS wheel-speed sensor and sensor rotor DSC HU/CM malfunction
SYSTEM WIRING DIAGRAM		—

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT ABS WHEEL-SPEED SENSOR DATA MONITOR Using the M-MDS, perform the PID inspection for ABS wheel-speed sensors. (See PID/DATA MONITOR INSPECTION [DSC HU/CM].) Are the monitoring values of all the wheels nearly the same when vehicle is driven?	Yes	Go to Step5.
		No	Go to the next step.
2	INSPECT TIRE AND TIRE PRESSURE Inspect tire size and tire pressure. (See WHEEL AND TIRE SPECIFICATION.) Is the tire of the specified size and air pressure?	Yes	Go to the next step.
		No	Replace with a specified tire or adjust the air pressure, then go to Step5.
3	VISUALLY INSPECT ABS SENSOR ROTOR Visually inspect the ABS sensor rotors for foreign material adhering or improper installation. Are the ABS sensor rotors normal?	Yes	Go to the next step.
		No	Replace the malfunction part, then go to Step5.
4	INSPECT CLEARANCE BETWEEN ABS SENSOR ROTOR AND ABS WHEEL-SPEED SENSOR Measure the clearance between ABS sensor rotors and ABS wheel-speed sensors. (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION.) Are the clearances normal?	Yes	Go to the next step.
		No	Replace the malfunction part, then go to the next step.
5	VERIFY DTC TROUBLESHOOTING COMPLETED Using the M-MDS, clear the DTC from the DSC HU/CM. (See CLEARING DTC [DSC HU/CM].) Using the M-MDS, perform the DSC HU/CM DTC inspection. (See DTC INSPECTION [DSC HU/CM].) Is the same DTC present?	Yes	Repeat the inspection from Step1. 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	VERIFY NO DTC IS PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DSC HU/CM].)
		No	DTC troubleshooting completed.

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