Evaluation: Cold start valve duty cycle display

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V.A.G 1551 display	Possible cause of malfunction	Corrective action
Below 70 or above 95%	Cold Start Injector N108 inoperative	Check Cold Start Injector N108 → Output Diagnostic Test Mode, performing .
	Injection pump timing severely incorrect	Dynamically check Start of injection and adjust → Start of injection, dynamically checking and adjusting .
	Air in fuel system	Check fuel supply system.