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

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DTC U2300:54 [CONNECTIVITY MASTER UNIT]

Description	Configuration data not received from instrument cluster
Detection condition	The connectivity master unit (CMU) cannot receive the configuration data from the instrument cluster for 30 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	DTCs are stored in the instrument cluster. Instrument cluster configuration not implemented Instrument cluster internal memory malfunction Instrument cluster configuration data error Connectivity master unit (CMU) malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY INSTRUMENT CLUSTER DTCs Retrieve the instrument cluster DTCs using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
2	RESET INSTRUMENT CLUSTER CONFIGURATION DATA Using the M-MDS, perform the instrument cluster configuration with the As-Built data. (See INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA).) Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT].) Switch the ignition ON (engine off or on) and wait for 37 s or more. Retrieve the connectivity master unit (CMU) DTCs using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].) Is the same DTC displayed?	Yes	Using the M-MDS, re-perform the instrument cluster configuration using the As-Built data, then go to the next step. (See INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA).)
		No	Go to Step 4.
3	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT].) Switch the ignition ON (engine off or on) and wait for 37 s or more. Retrieve the connectivity master unit (CMU) DTCs using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].) Is the same DTC displayed?	Yes	Replace the connectivity master unit (CMU), then go to the next step. (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)
		No	Go to the next step.
4	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CONNECTIVITY MASTER UNIT].)
		No	DTC troubleshooting completed.

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