Test conditions

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Vehicle stationary
On vehicles with automatic transmission selector lever in "P" or "N" position

Fig 1: Identifying Main Fuse Panel

Courtesy of VOLKSWAGEN UNITED STATES, INC.

All fuses must be OK.
All electrical consumers, e.g. lights and rear window defogger must be switched off.
The battery voltage must be at least 11.5 V.
Intake air temperature less than 80 ° C display group 04, display zone 4

Coolant temperature between 60 and 80 ° C display group 04, display zone 3
The catalyst temperature must be at least 350 ° , Display group 34, display zone 2

Coolant temperature must be at least 60 ° C, display group 04, display zone 3.

Indicated on display:

Basic setting
Input display group number XXX

Press keys 0 , 7 and 0 for the "Display group number 70" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

System in basic setting 70 →
1 2 3 4

Allow engine to continue running at idling speed.

When the diagnosis is initiated by the engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON"

Run engine at idling speed until specification "EVAP OK" is displayed in display zone 4.

If the display does not indicate as described:

Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .

If the display indicates as described:

Press C key.

Work step 8: Diagnosis of oxygen sensor operational readiness after catalyst

Indicated on display:

Basic setting
Input display group number XXX

Press keys 0 , 3 and 6 for "Display group number 36" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

System in basic setting 36 →
1 2 3 4

Set engine speed to 1800 to 2200 rpm using engine speed adjuster VAG1788/10 :
Maintain speed at 1800...2200 rpm until specification "B1-S2 OK" appears in display zone 2.

If the display does not indicate as described:

Remove engine speed adjuster VAG1788/10 from accelerator pedal.
Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .

If the display indicates as described:

Press C key.

Work step 9: Diagnosis of oxygen sensor aging after catalyst

Indicated on display:

Basic setting
Input display group number XXX

Press keys 0 , 4 and 3 for "Display group number 43" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

System in basic setting 43 →
1 2 3 4

Maintain engine speed at 1800...2200 rpm until display in display zone 4 jumps from "Test OFF" to "Test ON". Catalyst temperature in display zone 2 must be at least 300 ° C.
Continue to maintain speed at 1800...2200 rpm until specification "B1-S2 OK" appears in display zone 4.

If the display does not indicate as described:

Remove engine speed adjuster VAG1788/10 from accelerator pedal.
Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .

If the display indicates as described:

Press → key.

Work step 10: Diagnosis of oxygen sensor status

Indicated on display:

Rapid data transfer HELP
Select function XX

Press keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.

Indicated on display:

Read measured value block
Input display group number XXX

Press keys 0 , 3 and 4 for "Display group number 34" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

Read measured value block 34 →
1 2 3 4

Maintain engine speed at 1800...2200 rpm until: Catalyst temperature in display zone 2 must be at least 350 ° C.
Press C key.

Indicated on display:

Read measured value block
Input display group number XXX

Press keys 0 , 3 and 0 for "Display group number 30" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

Read measured value block 30 →
1 2 3 4

Check operating condition of oxygen sensor control before catalyst (display zone 1): Specification: x11
Check operating condition of oxygen sensor control after catalyst (display zone 2): Specification: xxx

NOTE:

The bits in display zone 2 will not be set to 1 until the catalyst temperature rises above 350 ° C ( Display group 34, display zone 2).

Significance of 3 digit number block in display zones 1 and 2:

Significance if display = 1
1	2	3
		1	Oxygen sensor control active
	1		Oxygen sensor operationally ready
1			Oxygen sensor heating on

If the specifications are not obtained:

Remove engine speed adjuster VAG1788/10 from accelerator pedal.
Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .

If the specifications are obtained:

Press → key.

Work step 11: Oxygen sensor aging diagnosis (cycle duration monitor)

Indicated on display

Rapid data transfer HELP
Select function XX

Press keys 0 and 4 for "Introduce basic setting" function and confirm entry with Q key.

Indicated on display:

Basic setting
Input display group number XXX

Press keys 0 , 3 and 4 for "Display group number 34" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

System in basic setting 34 →
1 2 3 4

Maintain engine speed at 1800 to 2200 rpm until display in display zone 4 jumps from "Test OFF" to "Test ON". Catalyst temperature in display zone 2 must be between 350 and 500 ° C.
Check cycle duration in display zone 3: Specification: maximum 2.5 s
Continue to maintain speed at 1800 to 2200 rpm until specification "B1-S1 OK" appears in display zone 4.

If display does not indicate as described:

Remove engine speed adjuster VAG1788/10 from accelerator pedal.
Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .

If display indicates as described:

Press C key.

Work step 12: Oxygen sensor control system diagnosis

Indicated on display:

Basic setting
Input display group number XXX

Press keys 0 , 3 and 7 for "Display group number 37" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

Read measured value block 37 →
1 2 3 4

If the diagnosis is initiated from engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON"

Continue to maintain speed at 1800...2200 rpm until specification "Syst. OK" appears in display zone 4.

If display does not indicate as described:

Remove engine speed adjuster VAG1788/10 from accelerator pedal.
Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .

If display indicates as described:

Press C key.

Work step 13: Catalyst diagnosis

NOTE:

The diagnosis will only be terminated if the oxygen sensor aging diagnosis is first successfully completed.

Indicated on display:

Basic setting
Input display group number XXX

Press keys 0 , 4 and 6 for "Display group number 46" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

System in basic setting 46 →
1 2 3 4

Maintain engine speed at 1800...2200 rpm until display in display zone 4 jumps from "Test OFF" to "Test ON". Catalyst temperature in display zone 2 must be at least 440 ° C.
Continue to maintain engine speed at 1800...2200 rpm until Specification "CatB1 OK" appears in display zone 4.

If display does not indicate as described:

Remove engine speed adjuster VAG1788/10 from accelerator pedal.
Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .

If display indicates as described:

Press C key.
Remove engine speed adjuster VAG1788/10 from accelerator pedal.

Work step 14: Secondary air system diagnosis

Allow engine to continue running at idling speed.

Indicated on display

Basic setting
Input display group number XXX

Press keys 0 , 7 and 7 for Display group number 77" and confirm entry with Q key.

Indicated on display: (1...4 = Display zones)

System in basic setting 77 →
1 2 3 4

If the diagnosis is initiated from engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON"

Continue to run engine at idling speed until specification "Syst. OK" appears in display zone 4.

If the display does not indicate as described:

Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .

If the display indicates as described:

Press → key.

Work step 15: Read readiness code

Read readiness code → Readiness code, reading

Generating readiness code for engine code AWW, work steps 1 to 5

Work step Function/Diagnosis		Function/Block	Display zone 1	Display zone 2	Display zone 3	Display zone 4	Test conditions
1	Check DTC memory	02/---	---	---	---	---	Ignition on
2	Clear DTC memory	05/---	---	---	---	---	Ignition on
3	Adaptation of throttle valve control module	04/060	Throttle valve angle (Sensor 1)	Throttle valve angle (Sensor 2)	---	Result	Ignition on
			3...93%	97...3%	0...8	ADP. OK
4	Temperature scan	08/004		Battery voltage	Coolant	Intake air	Idling
			640...820/min	8.0...15.0 V	60...80 ° C	max. 80 ° C
5	Leak diagnosis	04/071	REED status	Text	Text	Result	Idling
			Reed cl.	---	Check. END	Syst. OK

Generating readiness code for engine code AWW, work steps 6 to10

Work step Function/Diagnosis		Function/Block	Display zone 1	Display zone 2	Display zone 3	Display zone 4	Test conditions
6	Fuel supply	04/107	Engine speed	Oxygen sensor control		Result	Idling
			640...820/min	-23.0...23.0%		Syst. OK
7	Tank venting	04/070	Degree of valve opening	Oxygen sensor control		Result	Idling
	EVAP valve N80		0.0...10.0%	-7.0...7.0%	min. 30.0%	EVAP OK
8	Oxygen sensor readiness	04/036	Oxygen sensor voltage after Cat.	Result			1800...2200 rpm
	after Catalyst		0.1...0.4 V or 0.5...0.9 V	B1-S2 OK
9	Oxygen sensor aging	04/043	Engine speed	Cat.-Temp.	Oxygen sensor voltage after Cat.	Result	1800...2200 rpm
	after Catalyst		1800...2200/min	min. 300 ° C	0.1...0.9 V	B1-S2 OK
10	Oxygen sensor status	08/030	Oxygen sensor status before Cat.	Oxygen sensor status after Cat.			1800...2200 rpm
			x11	xxx

Generating readiness code for engine code AWW, work steps 11 to 15

Work step Function/Diagnosis		Function/Block	Display zone 1	Display zone 2	Display zone 3	Display zone 4	Test conditions
11	Oxygen sensor aging	04/034	Engine speed	Cat.-Temp.	Operation time	Result	1800...2200 rpm
	before Catalyst		1800...2200 rpm	min. 350 ° C	0.5...2.5 s	B1-S1 OK
12	Oxygen sensor control	04/037	Engine load	Oxygen sensor voltage after Cat.	Dwell time	Result	1800...2200 rpm
	Dwell time		12.0...30.0%	0.1...0.9 V	-0.02...0.02	Syst. OK
13	Conversion Catalytic converter	04/046	Engine speed	Cat.-Temp.	Conversion	Result	1800...2200 rpm
			1800...2200 rpm	min. 440 ° C	0.0...0.32	CatB1 OK
14	Secondary Air system	04/077	Engine speed	Air Mass Motor	Air Mass Secondary air	Result	Idling
			640...820/min	5.0...12.0 g/s	-45...100%	Syst. OK
15	Read readiness code	15/---	---	---	---	---	Ignition on