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

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DTC U0001:88/U0100:00/U0100:08/U0121:00/U0121:02/U0121:87/U0155:00 [EVP CONTROL UNIT]

DTC	U0001:88	CAN communication: module communication error
	U0100:00	CAN communication: communication error to PCM
	U0100:08
	U0121:00	CAN communication: communication error to DSC HU/CM
	U0121:02
	U0121:87
	U0155:00	CAN communication: communication error to instrument cluster
DETECTION CONDITION		DTC U0001:88 Open or short circuit in CAN system wiring harness for a continuous 1.4 s. DTC U0100:00 Engine speed signal via CAN communication cannot be received from the PCM for a continuous 5 s. DTC U0100:08 Vacuum sensor 2 signal via CAN communication cannot be received from the PCM for a continuous 5 s. DTC U0121:00 CAN communication from the DSC HU/CM is interrupted for a continuous 5 s. DTC U0121:02 Brake fluid pressure signal via CAN communication cannot be received from the PCM for a continuous 5 s. DTC U0121:87 Vehicle speed signal via CAN communication cannot be received from the DSC HU/CM for a continuous 5 s. DTC U0155:00 CAN communication from the instrument cluster is interrupted for a continuous 5 s.
FAIL-SAFE FUNCTION		Refer to “Fail-safe function table”. (See DTC TABLE [EVP CONTROL UNIT].)
POSSIBLE CAUSE		CAN communication line malfunction CAN communication line malfunction with PCM CAN communication line malfunction with DSC HU/CM CAN communication line malfunction with instrument cluster Instrument cluster malfunction
SYSTEM WIRING DIAGRAM		—

Diagnostic Procedure

Perform inspection according to the diagnostic procedure in MULTIPLEX COMMUNICATION SYSTEM. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

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