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

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DTC U0402:68 [INSTRUMENT CLUSTER]

Description	Error signal received from TCM
Detection condition	Instrument cluster received the error signals from the TCM for 1 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	The TCM could not send a normal signal temporarily. (DTCs are stored in the TCM.) TCM malfunction Instrument cluster malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY TCM DTCs Retrieve the TCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (SJ6A-EL)].)
		No	Go to the next step.
2	DRIVE VEHICLE THEN VERIFY DTCs FOR TCM AGAIN Drive the vehicle at a vehicle speed of 30 km/h {19 mph} or more for 100 s or more. Retrieve the TCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (SJ6A-EL)].)
		No	Go to the next step.
3	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the instrument cluster using the M-MDS. (See CLEARING DTC [INSTRUMENT CLUSTER].) Switch the ignition ON (engine off or on) and wait for 20 s or more. Retrieve the instrument cluster DTCs using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) Is the same DTC displayed?	Yes	Replace the instrument cluster, then go to the next step. (See INSTRUMENT CLUSTER 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 [INSTRUMENT CLUSTER].)
		No	DTC troubleshooting completed.

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