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

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DTC C0020:01/C0020:13/C0020:16/C0020:49/C0020:71/C0020:98 [DSC HU/CM]

DTC	C0020:01	Pump motor
	C0020:13
	C0020:16
	C0020:49
	C0020:71
	C0020:98
DETECTION CONDITION		RR outlet solenoid valve malfunction is detected.
FAIL-SAFE FUNCTION		Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
POSSIBLE CAUSE		Fuse (ABS/DSCM 50A) malfunction Open or short circuit in wiring harness between battery and DSC HU/CM terminal B Open circuit in wiring harness between DSC HU/CM terminal AL and body ground Poor connection at each connector Pump motor malfunction Pump motor is driven for long periods

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT FUSE CONDITION Is the fuse (ABS/DSCM 50A) normal?	Yes	Go to the next step.
		No	If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between fuse and DSC HU/CM terminal B. 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. Replace the fuse. If the fuse is damaged: Replace the fuse. Go to Step5.
2	VERIFY PUMP MOTOR OPERATION Using the M-MDS, perform the simulation inspection for pump motor. (See SIMULATION INSPECTION [DSC HU/CM].) Does the pump motor operate?	Yes	Go to Step5.
		No	Go to the next step.
3	INSPECT PUMP MOTOR POWER SUPPLY CIRCUIT FOR OPEN OR SHORT TO GROUND CIRCUIT Switch the ignition OFF. Disconnect the DSC HU/CM connector. Switch the ignition ON (engine off). Measure the voltage between DSC HU/CM terminal B (wiring harness-side) and body ground. Is the voltage 10 V or more?	Yes	Go to the next Step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between battery and DSC HU/CM terminal B. 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 or short circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open or short circuit. Go to Step5.
4	INSPECT PUMP MOTOR GROUND CIRCUIT FOR OPEN CIRCUIT OR POOR GROUND Switch the ignition OFF. Disconnect the DSC HU/CM connector. Measure the resistance between DSC HU/CM terminal AL (wiring harness-side) and body ground. Is the resistance 0—1 ohm?	Yes	Go to the next step.
		No	If the open circuit could be detected in the wiring harness: Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and body ground. 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 an open circuit. Go to the next step. If the resistance is out of specification: Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and body ground. 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 poor ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a poor ground. Go to the next step.
5	VERIFY DTC TROUBLESHOOTING COMPLETED Reconnect all disconnected connectors. 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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