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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/U0121:00/U0155:00 [EPS CONTROL MODULE]

DTC	U0001:88	CAN communication: module communication error
	U0100:00	CAN communication: communication error to PCM
	U0121:00	CAN communication: communication error to DSC HU/CM
	U0155:00	CAN communication: communication error to instrument cluster
DETECTION CONDITION		U0001:88 Error detected in CAN bus communication line with CAN connection modules. U0100:00 Communication error to PCM is detected in CAN communication. U0121:00 Communication error to DSC HU/CM is detected in CAN communication. U0155:00 Communication error to instrument cluster is detected in CAN communication.
FAIL-SAFE FUNCTION		Refer to “Fail-safe function table”. (See DTC TABLE [EPS CONTROL MODULE].)
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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