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

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DTC U0415:00/U0415:29/U0415:86 [EVP CONTROL UNIT]

DTC	U0415:00	CAN communication: signal error from DSC HU/CM
	U0415:29
	U0415:86
DETECTION CONDITION		DTC U0415:00 Signal from the DSC HU/CM is not received for 5 s. DTC U0415:29 Brake fluid pressure error from the DSC HU/CM continues for 1 s. DTC U0415:86 Vehicle speed signal error from the DSC HU/CM continues for 5 s.
FAIL-SAFE FUNCTION		Refer to “Fail-safe function table”. (See DTC TABLE [EVP CONTROL UNIT].)
POSSIBLE CAUSE		DSC HU/CM malfunction
SYSTEM WIRING DIAGRAM		—

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY DSC HU/CM DTC Using the M-MDS, perform the DSC HU/CM DTC inspection. (See DTC INSPECTION [DSC HU/CM].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DSC HU/CM].) DTC troubleshooting completed, then go to the next step.
		No	Go to the next step.
2	VERIFY DTC TROUBLESHOOTING COMPLETED Using the M-MDS, clear the DTC from the EVP control unit. (See CLEARING DTC [EVP CONTROL UNIT].) Using the M-MDS, perform the EVP control unit DTC inspection. (See DTC INSPECTION [EVP CONTROL UNIT].) 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.
3	VERIFY NO DTC IS PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [EVP CONTROL UNIT].)
		No	DTC troubleshooting completed.

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