Preparation for Test 1. Review 11 , 12 , 13 , 14 , 15 , 20 , 21 , 22 , 31 , 32 , 41 , 42 2. Ignition: ON 3. Press . 4. Set both temperature selectors to °F. 5. Press for > 5 secs. 6. The left display will alternately show the number and the in-car temperature (e.g. °F) 7. By pressing the next highest test step is displayed (see table). 8. Press to end test program. The display will show " " (Error) if there is a short or open circuit, negative sensor values will be shown in the left display (e.g. - ).

Display code in N22 window		Possible cause	Test step/Remedy 1)
		In-car temperature sensor (B10/4)	23 4.0
		Outside temperature indicator temperature sensor (B14)	23 21.0
		Heater core temperature sensor left (B10/1)	23 7.0
		Heater core temperature sensor right (B10/1)	23 8.0
		Evaporator temperature sensor (B10/6)	23 5.0
		ECT sensor (DFI, IFI) (B11/4)	23 21.0
		Refrigerant pressure in bar, e.g. corresponds to 4 bar	23 9.0
		Refrigerant temperature sensor (B12/1), e.g, corresponds to 73 ° F	23 6.0
	-	Not used	-
		Blower control voltage, e.g. (min) - (max) corresponds to .8 - 6 V	23 17.0
		Emissions sensor (B31) e.g. corresponds to 3.1 V	23 12.0
		Sun sensor (B32) e.g. corresponds to 4.2 V	23 10.0
	-	Control current for auxliary fan e.g. corresponds to 7 mA	23 13.0
		Engine speed, e.g. . . (x 100) corresponds to 9900 rpm	23 21.0
		Vehicle speed (km/h)	23 21.0
		Terminal 58d e.g. corresponds to 99 % battery voltage	-
	-	Battery voltage e.g. = 12.8 V	-
		Software status e.g.	-
		Hardware status e.g.	-

1) Observe Preparation for Test, see 22 .