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

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DTC U0401:68 [FORWARD SENSING CAMERA (FSC)]

Description	Error signal received from PCM
Detection condition	Forward sensing camera (FSC) receives the error signal from the PCM for 5 s or more.
Fail-safe	Inhibits the lane departure warning system (LDWS). Inhibits the high beam control (HBC) system.
Possible cause	DTCs are stored in the PCM. PCM malfunction Forward sensing camera (FSC) malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.0)].)
		No	Go to the next step.
2	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the forward sensing camera (FSC) using the M-MDS. (See CLEARING DTC [FORWARD SENSING CAMERA (FSC)].) Switch the ignition ON (engine off or on) and wait for 6.5 s or more. Retrieve the forward sensing camera (FSC) DTCs using the M-MDS. (See DTC INSPECTION [FORWARD SENSING CAMERA (FSC)].) Is the same DTC displayed?	Yes	Replace the forward sensing camera (FSC), then go to the next step. (See FORWARD SENSING CAMERA (FSC) REMOVAL/INSTALLATION.)
		No	Go to the next step.
3	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 [FORWARD SENSING CAMERA (FSC)].)
		No	DTC troubleshooting completed.

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