Audi Workshop Service and Repair Manuals

Generating readiness code Special tools and workshop equipment required

t  Engine speed adjuster -V.A.G 1788/10-   Note t  Vehicle is stationary. t  Vehicles with automatic gearbox: selector lever in position P or N t  Electrical equipment switched off (radiator fan must not run during the test). t  Air conditioner switched off. t  Coolant temperature at least 80 °C ⇒ Display group 004, display zone 3. Important: Warm up engine if possible by means of a test drive.   Note If, within a given step, “OK” is immediately displayed as test result following selection of a display group, the test has already been implemented and it is possible to proceed with the next step. Work step 1: Interrogating fault memory   Note Engine stopped, ignition switched on –  Connect up the vehicle diagnostic and service information system -VAS 5052- and select the engine electronics control unit. –  Select the function “Interrogate fault memory”. The display will show the number of faults stored in the memory or “No fault detected!”. If a fault has been stored: –  Eliminate fault, erase fault memory. Perform test drive and interrogate fault memory again as a check. If there are no faults stored: –  Press the → key. Work step 2: Erasing fault memory   Note Engine stopped, ignition switched on –  Select the function “Erase fault memory”.   Note The readiness code is reset on erasing the fault memory and must therefore be generated again. –  Press the → key. Work step 3: Adapting throttle valve module to engine control unit   Note Engine stopped, ignition switched on –  Select the function “Start basic setting”. –  Select “Display group number 060” and confirm. –  Check the specifications in display zones 3 and 4:

	Display zones
	1	2	3	4
Display group 060: Adaption of throttle valve module
Readout	xx %	xx %	x	---
Display shows	Throttle valve angle (angle sender 1)	Throttle valve angle (angle sender 2)	Adaption step counter	Adaption status
Operating range			0...8	ADP in progress ADP OK ERROR
Specification	3...93 %	97...3 %	8	ADP OK
Note			Following adaption, the adaption step counter reaches the number 8 (numbers may also be skipped).	If “ERROR” is displayed: Interrogate fault memory → Chapter.

Note During adaption, different numbers representing the respective adaption status are displayed in zone 3. The crucial factor is not the behaviour of the adaption step counter (display zone 3) during adaption, but rather that the specification “ADP OK” is displayed in zone 4 after adaption. If the reading matches the specification “ADP OK”: –  Press the C key. Work step 4: Adapting kickdown function → Note 1)  Vehicles with automatic gearbox only   Note Engine stopped, ignition switched on –  Select “Display group number 063”.   Note You will then be given the prompt “Operate kickdown”. –  Fully depress accelerator pedal beyond kickdown point and keep it pressed.   Note During kick-down point adaption the display on -V.A.G 1551- shows “Kick-down ADP. running”. Following successful kick-down point adaption, the display on -V.A.G 1551- will show “Kick-down ADP. OK”. –  Check the readout in display zone 4:

	Display zones
	1	2	3	4
Display group 063: Adapting kickdown function
Readout	xx %	xx %	Kickdown	---
Display shows	Accelerator position sender 1	Learnt kickdown value/accelerator position sender 1	Kickdown	Adaption status
Range			Kickdown	depress ADP. running ADP. OK ERROR
Specification	79...94 %	79...94 %	Kickdown	ADP. O.K.
Note				If display shows “ERROR”: Interrogate fault memory → Chapter.

Note “ERROR” may be displayed for example if the accelerator pedal is not floored immediately after the tester prompt or if the accelerator pedal is released whilst the adaption process is still running and has not yet been completed. In both cases, exit from “Basic setting” mode and repeat the adaption process. If the reading matches the specification “ADP OK”: –  Press the C key. Work step 5: Checking operating status of Lambda control –  Start engine (on vehicles with manual gearbox: press clutch pedal)   Note After starting the engine it may be necessary to re-select the engine control unit with “address word” 01 and to start the “Basic setting” function with “04”. –  Fit engine speed adjuster -V.A.G 1788/10- on accelerator pedal and increase engine speed to 2000 rpm.   Note Engine running at 2000 rpm –  Select “Display group number 030”. –  Check the lambda probe status in display zones 1 and 2.   Note It may take several minutes to obtain the result of diagnosis.

	Display zones
	1	2	3	4
Display group 030: Lambda probe status
Readout	X X X	X X X
Display shows	Lambda probe status bank 1, probe 1	Lambda probe status bank 1, probe 2
Operating range	0 = off 1 = on	0 = off 1 = on
Specification	1 1 1	1 1 0

Significance of 3-position displays in display group 030
X	X	X	Display zones 1 and 2
		X	Lambda control: 0 = not active; 1 = active
	X		Lambda probe condition: 0 = not active; 1 = active
X			Lambda probe heating condition: 0 = not active; 1 = active

Note t  The first position of the 3-position display (heating) fluctuates between 0 and 1 at certain operating points. t  Lambda control of the lambda probe downstream of the catalytic converter (bank 1, probe 2) is not active without engine load, that is, the 3rd position of the 3-position display is 0. –  Do not continue with testing until the displays have reached “111” in display zone 1 and “110” in display zone 2 at least once. Work step 6: Diagnosis of ageing of Lambda probe before catalytic converter   Note Engine still running at 2000 rpm. –  Select “Display group number 034”. –  Check the specification in display zone 4:   Note It may take several minutes to obtain the result of diagnosis.

	Display zones
	1	2	3	4
Display group 034: Diagnosis of ageing of Lambda probe before catalytic converter (bank 1)
Readout	xxxx rpm	xxx °C	x.x	---
Display shows	Engine speed	Exhaust gas temperature	Dynamic factor	Diagnosis status
Operating range				Test OFF Test ON B1-S1 OK B1-S1 n.OK
Specification	2000 rpm	Greater than 350 °C	0.5...2.5	B1 - S1 OK
Note				If display shows "B1 - S1 n.OK": interrogate fault memory → Chapter.

If the reading matches the specification "B1 - S1 OK": –  Press the C key. Work step 7: Diagnosis of condition of Lambda probe after catalytic converter   Note Engine still running at 2000 rpm. –  Select “Display group number 036”. –  Check the specification in display zone 2:

	Display zones
	1	2	3	4
Display group 036: Condition of Lambda probe after catalytic converter (bank 1)
Readout	x.xxx V	---
Display shows	Lambda probe voltage bank 1, probe 2	Diagnosis status
Operating range		Test OFF Test ON B1 - S2 OK B1 - S2 n.OK
Specification	0.100...0.950 V	B1 - S2 OK
Note		If display shows "B1 - S2 n.OK": interrogate fault memory → Chapter.

If the reading matches the specification "B1 - S2 OK": –  Press the C key. Work step 8: Diagnosis of Lambda control system   Note Engine still running at 2000 rpm. –  Select “Display group number 037”. –  Check the specification in display zone 4:

	Display zones
	1	2	3	4
Display group 037: Diagnosis of Lambda control system (bank 1)
Readout	xxx %	x.xxx V	x.xx	---
Display shows	Load	Lambda probe voltage bank 1, probe 2	Lambda correction value between bank 1, probe 1 and bank 1, probe 2	Diagnosis status
Operating range				Test OFF Test ON Syst. OK Syst. n.OK
Specification	13...40 %	0.100...0.950 V	Less than 0.02	Syst. OK
Note				If display shows “Syst. n.OK”: interrogate fault memory → Chapter.

If the reading matches the specification “Syst. OK”: –  Press the C key. Work step 9: Diagnosis of ageing of Lambda probe after catalytic converter   Note Engine still running at 2000 rpm. –  Select “Display group number 043”. –  Check the specification in display zone 4:

	Display zones
	1	2	3	4
Display group 043: Diagnosis of ageing of Lambda probe after catalytic converter (bank 1)
Readout	xxxx rpm	xxx °C	x.xxx V	---
Display shows	Engine speed	Exhaust gas temperature	Lambda probe voltage bank 1, probe 2	Diagnosis status
Operating range				Test OFF Test ON B1 - S2 OK B1 - S2 n.OK
Specification	2000 rpm	Greater than 350 °C	0.100...0.950 V	B1 - S2 OK
Note				If display shows "B1 - S2 n.OK": interrogate fault memory → Chapter.

If the reading matches the specification "B1 - S2 OK": –  Press the C key. Work step 10: Diagnosis of catalytic converter   Note Engine still running at 2000 rpm. –  Select “Display group number 046”. –  Check the specifications in display zones 2 and 4:   Note The test duration for catalytic converter diagnosis is approximately 60 seconds.

	Display zones
	1	2	3	4
Display group 046: Diagnosis of catalytic converter (bank 1)
Readout	xxxx rpm	xxx °C	x.xx	---
Display shows	Engine speed	Exhaust gas temperature	Measured value CAT conversion	Diagnosis status
Operating range			0...8	Test OFF Test ON CAT B1 OK CAT B1 n.OK
Specification	2000 rpm	Greater than 440 °C	Greater than 1.0	Cat B1 OK
Note		The test is not started if the exhaust gas temperature is not within the specified range. Increase or reduce engine speed if necessary.		If display shows “Cat B1 n.OK”: interrogate fault memory → Chapter. If no fault has been stored, renew catalytic converter.

If reading matches specification “CAT B1 OK”: –  Press the C key. Work step 11: Diagnosis of fuel tank breather valve –  Remove the speed setting tool -V.A.G 1788/10- and leave the engine idling.   Note Engine idling. –  Select “Display group number 070”. –  Check the specification in display zone 4:   Note If the test is not started or if the display switches from “Test ON” to “Test OFF”, give a brief burst of throttle and the test will be repeated.

	Display zones
	1	2	3	4
Display group 070: Diagnosis of fuel tank breather valve
Readout	xx %	xx %		---
Display shows	Degree of opening of fuel tank breather valve	Lambda control diagnosis value		Diagnosis status
Operating range				Test OFF Test ON TBV OK TBV n.OK Abort
Specification	0...99 %	Less than -7 % or greater than 7 %		TBV OK
Note				If display shows “TBV n.OK”: interrogate fault memory → Chapter. Check the activated charcoal filter system solenoid valve 1 -N80- → Chapter

If specified value “TBV. OK” is attained: –  Press the C key. Work step 12: Diagnosis of secondary air system   Note Engine idling.   Note The secondary air pump operates for several seconds during secondary air system diagnosis. –  Select “Display group number 077”. –  Abruptly floor the accelerator pedal and release it again (brief burst of throttle of at least 2500 rpm). –  Check the specification in display zone 4:   Note The secondary air system test duration is approximately 60 seconds.

	Display zones
	1	2	3	4
Display group 077: Diagnosis of secondary air system (bank 1)
Readout	xxxx rpm	xx.x g/s	xx %	---
Display shows	Engine speed	Air mass	Relative air mass bank 1, secondary air system	Diagnosis status
Operating range				Test OFF Test ON Syst. OK Syst. n.OK Abort
Specification	700...840 rpm → Note 640...760 rpm → Note	2...5 g/s	Greater than -20 %	Syst. OK
Note				If display shows “Syst. n.OK”: interrogate fault memory → Chapter.

2)  Manual gearbox, front and four-wheel drive 3)  Automatic gearbox, front-wheel drive If the reading matches the specification “Syst. OK”: –  Press the → key. Work step 13: Reading out readiness code –  Read out the readiness code again → Chapter.