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

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DTC C0051:95 [START STOP UNIT]

Description	Steering angle sensor assembly malfunction
Detection condition	Start stop unit receives the following signals with the ignition switched ON (engine off or on). Steering angle sensor assembly malfunction from electric power steering (EPS) control module for 1 s or more Improper assembly of steering angle sensor at 360° Steering wheel angle of 720° or more for 0.048 s or more
Fail-safe	Not applicable
Possible cause	DTCs are stored in the electric power steering (EPS) control module. Improper assembly of steering angle sensor Start stop unit malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY ELECTRIC POWER STEERING (EPS) CONTROL MODULE DTCs Retrieve the electric power steering (EPS) control module DTCs using the M-MDS. (See DTC INSPECTION [EPS CONTROL MODULE].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [EPS CONTROL MODULE].)
		No	Go to the next step.
2	VERIFY STEERING ANGLE SENSOR INSTALLATION CONDITION Verify the steering angle sensor installation condition. (See CLOCK SPRING INSPECTION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See CLOCK SPRING INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Is the steering angle sensor installed correctly?	Yes	Go to the next step.
		No	Install the steering angle sensor correctly, then go to the next step. (See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
3	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) Switch the ignition ON (engine off or on) and wait for 1 s or more. Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the same DTC displayed?	Yes	Replace the start stop unit, then go to the next step. (See START STOP UNIT 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 [START STOP UNIT].)
		No	DTC troubleshooting completed.

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