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

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DTC C0037:01/C0037:11/C0037:12/C0037:14/C0037:28/C0037:64 [DSC HU/CM]

DTC	C0037:01	ABS wheel-speed sensor (LR)
	C0037:11
	C0037:12
	C0037:14
	C0037:28
	C0037:64
DETECTION CONDITION		C0037:01 Malfunction detected in ABS wheel-speed sensor (LR) power supply voltage. C0037:11 Short to ground detected in ABS wheel-speed sensor (LR) power supply. C0037:12 ABS wheel-speed sensor (LR) signal system detects power supply short circuit. C0037:14 ABS wheel-speed sensor (LR) signal system detects short to ground or open circuit. C0037:28 ABS wheel-speed sensor (LR) detects extremely high vehicle speed. C0037:64 ABS wheel-speed sensor (LR) error signal is detected.
FAIL-SAFE FUNCTION		Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
POSSIBLE CAUSE		Short to power circuit in wiring harness between ABS wheel-speed sensor (LR) terminal B and DSC HU/CM terminal P Short to ground circuit in wiring harness between ABS wheel-speed sensor (LR) terminal A and DSC HU/CM terminal R Short to ground circuit in wiring harness between ABS wheel-speed sensor (LR) terminal B and DSC HU/CM terminal P Open circuit in wiring harness between ABS wheel-speed sensor (LR) terminal A and DSC HU/CM terminal R Open circuit in wiring harness between ABS wheel-speed sensor (LR) terminal B and DSC HU/CM terminal P ABS sensor rotor (LR) malfunction ABS wheel-speed sensor (LR) installation malfunction ABS wheel-speed sensor (LR) malfunction DSC HU/CM malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT ABS WHEEL-SPEED SENSOR (LR) DATA MONITOR Using the M-MDS, perform the PID inspection for ABS wheel-speed sensor (LR). (See PID/DATA MONITOR INSPECTION [DSC HU/CM].) Is the ABS wheel-speed sensor (LR) normal?	Yes	Go to Step5.
		No	Go to the next step.
2	INSPECT ABS WHEEL-SPEED SENSOR (LR) SIGNAL CIRCUIT FOR SHORT TO POWER CIRCUIT Disconnect the ABS wheel-speed sensor (LR) connector. Measure the voltage between ABS wheel-speed sensor (LR) terminal B (wiring harness-side)—body ground Is the voltage 10 V or less?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between ABS wheel-speed sensor (LR) terminal B and DSC HU/CM terminal P. 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 power circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power circuit. Go to Step7.
3	INSPECT ABS WHEEL-SPEED SENSOR (LR) CIRCUIT FOR SHORT TO GROUND CIRCUIT Disconnect the ABS wheel-speed sensor (LR) connector. Inspect for continuity as followings: ABS wheel-speed sensor (LR) terminal A (wiring harness-side)—body ground ABS wheel-speed sensor (LR) terminal B (wiring harness-side)—body ground Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector in the followings: ABS wheel-speed sensor (LR) terminal A—DSC HU/CM terminal R ABS wheel-speed sensor (LR) terminal B—DSC HU/CM terminal P 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 circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground circuit. Go to Step7.
		No	Go to the next step.
4	INSPECT ABS WHEEL-SPEED SENSOR (LR) CIRCUIT FOR OPEN CIRCUIT Disconnect the ABS wheel-speed sensor (LR) connector. Disconnect the DSC HU/CM connector. Inspect for continuity as followings: ABS wheel-speed sensor (LR) terminal A (wiring harness-side)—DSC HU/CM terminal R ABS wheel-speed sensor (LR) terminal B (wiring harness-side)—DSC HU/CM terminal P Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector in the followings: ABS wheel-speed sensor (LR) terminal A—DSC HU/CM terminal R ABS wheel-speed sensor (LR) terminal B—DSC HU/CM terminal P 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 an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a open circuit. Go to Step7.
5	VISUALLY INSPECT ABS SENSOR ROTOR (LR) Visually inspect the ABS sensor rotor for foreign material adhering or improper installation. Is the ABS sensor rotor (LR) normal?	Yes	Go to the next step.
		No	Replace the ABS sensor rotor (LR), then go to Step7. (See WHEEL HUB COMPONENT REMOVAL/INSTALLATION.)
6	INSPECT CLEARANCE BETWEEN ABS SENSOR ROTOR (LR) AND ABS WHEEL-SPEED SENSOR (LR) Measure the clearance between ABS sensor rotor (LR) and ABS wheel-speed sensor (LR). (See REAR ABS WHEEL-SPEED SENSOR INSPECTION.) Is the clearance normal?	Yes	Go to the next step.
		No	Replace the malfunction part, then go to the next step.
7	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.
8	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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