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

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DTC C1A77:11/C1A77:12/C1A77:49 [DSC HU/CM]

DTC	C1A77:11	Valve relay
	C1A77:12
	C1A77:49
DETECTION CONDITION		Malfunction detected in valve relay power supply voltage. Valve relay does not operate normally.
FAIL-SAFE FUNCTION		Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
POSSIBLE CAUSE		Open or short circuit in DSC HU/CM internal valve relay, or stuck valve relay
SYSTEM WIRING DIAGRAM		—

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY DSC HU/CM DTC 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].) Are any DTCs present?	Yes	Replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
		No	Go to the next step.
2	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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