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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/U0101:00/U0121:00/U0131:00/U0140:00/U0151:00/U0155:00/U0182:00/U0214:00/U023A:00 [CONNECTIVITY MASTER UNIT]

Description	U0001:88 Module communication error (HS-CAN) U0100:00 Communication error with PCM U0101:00 Communication error with TCM U0121:00 Communication error with DSC HU/CM U0131:00 Communication error with electric power steering (EPS) control module U0140:00 Communication error with BCM U0151:00 Communication error with SAS control module U0155:00 Communication error with instrument cluster U0182:00 Communication error with auto leveling control module or adaptive front lighting system (AFS) control module U0214:00 Communication error with start stop unit U023A:00 Communication error with forward sensing camera (FSC)
Detection condition	U0001:88 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot detect a CAN bus communication line (HS-CAN) signal for 1 s or more. With the ignition switched ON (engine off or on), the connectivity master unit (CMU) detects malfunction in the CAN bus communication line (HS-CAN) 10 times continuously. U0100:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the PCM for 5 s or more. U0101:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the TCM for 5 s or more. U0121:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the DSC HU/CM for 5 s or more. U0131:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the electric power steering (EPS) control module for 5 s or more. U0140:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the BCM for 5 s or more. U0151:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the SAS control module for 5 s or more. U0155:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the instrument cluster for 5 s or more. U0182:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the auto leveling control module or adaptive front lighting system (AFS) control module for 5 s or more. U0214:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the start stop unit for 5 s or more. U023A:00 With the ignition switched ON (engine off or on), the connectivity master unit (CMU) cannot receive a CAN signal from the forward sensing camera (FSC) for 5 s or more.
Fail-safe	U0001:88 Not applicable U0100:00 Not applicable U0101:00 Not applicable U0121:00 Not applicable U0131:00 Not applicable U0140:00 Not applicable U0151:00 Not applicable U0155:00 Not applicable U0182:00 Not applicable U0214:00 Not applicable U023A:00 Not applicable
Possible cause	Malfunction in CAN bus communication line Malfunction in CAN communication line between the PCM and connectivity master unit (CMU) Malfunction in CAN communication line between the TCM and connectivity master unit (CMU) Malfunction in CAN communication line between the DSC HU/CM and connectivity master unit (CMU) Malfunction in CAN communication line between the electric power steering (EPS) control module and connectivity master unit (CMU) Malfunction in CAN communication line between the BCM and connectivity master unit (CMU) Malfunction in CAN communication line between the SAS control module and connectivity master unit (CMU) Malfunction in CAN communication line between the instrument cluster and connectivity master unit (CMU) Malfunction in CAN communication line between the auto leveling control module or adaptive front lighting system (AFS) control module and connectivity master unit (CMU) Malfunction in CAN communication line between the start stop unit and connectivity master unit (CMU) Malfunction in CAN communication line between the forward sensing camera (FSC) and connectivity master unit (CMU)
System wiring diagram	Not applicable

Diagnostic Procedure

Perform the malfunction diagnosis according to the troubleshooting procedure for the multiplex communication system. (See FOREWORD.)

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