Audi Workshop Service and Repair Manuals

Basic setting Test conditions l  Coolant temperature at least 80 °C l  Electrical equipment switched off (radiator fan must not run during the test). l  Air conditioner switched off. l  Selector lever in position P or N. Test sequence –  Connect up the vehicle diagnosis and service information system -VAS 5052- and select vehicle system “Engine electronics”. When doing this, the ignition must be switched on. Or, depending on desired operation: –  Start engine. –  Select diagnostic function “Basic setting”. –  Enter the required display group number (3 figures) and confirm entry. Example: –  Enter “003” for “display group number 003” and confirm. DIsplay group 03 at idling speed This display group is used for checking the exhaust gas recirculation. The exhaust gas recirculation valve -N18- is alternately opened and closed for 10 seconds. Checking exhaust gas recirculation system → Rep. Gr.26

	System in basic setting 3			→	▾ Indicated on display
	1000 rpm	EGR active	169 mg/H	0 %
					Duty cycle (activation) of EGR valve
				Intake air mass
			Exhaust gas recirculation valve -N18- open
		Engine speed

	System in basic setting 3			→	▾ Indicated on display
	1000 rpm	EGR n.active	415 mg/H	100 %
					Duty cycle (activation) of EGR valve
				Intake air mass
			Exhaust gas recirculation valve -N18- closed
		Engine speed

Display group 04 at idling speed This display group is used for checking injection timing control. The injection timing control is moved between the “advanced” and “retarded” positions every 10 seconds.

	System in basic setting 4			→	▾ Indicated on display
	850 rpm	Advanced	15.4° BTDC	29 %
					Duty cycle (activation) of commencement of injection valve
				Commencement of injection at least 12° BTDC is okay
			Commencement of injection valve -N108- is activated until specification of at least 12° BTDC is achieved
		Engine speed

	System in basic setting 4			→	▾ Indicated on display
	850 rpm	Retarded	1.2° ATDC	100 %
					Duty cycle (activation) of commencement of injection valve
				Commencement of injection between 4° ATDC and 0° ATDC is okay
			Commencement of injection valve -N108- open
		Engine speed

Display group 11 at idling speed This display group is used for checking the charge pressure (boost pressure) control. The charge pressure control solenoid valve -N75- is opened and closed alternately for periods of 10 seconds. Checking charge pressure control → Rep. Gr.21.

	System in basic setting 11			→	▾ Indicated on display
	1000 rpm	On	1040 mbar	100 %
					Activation of charge pressure control solenoid valve -N75-
				Charge pressure
			Charge pressure control solenoid valve -N75- open
		Engine speed

	System in basic setting 11			→	▾ Indicated on display
	1000 rpm	Off	979 mbar	0 %
					Activation of charge pressure control solenoid valve -N75-
				Charge pressure
			Charge pressure control solenoid valve -N75- closed
		Engine speed