With Manufacturer's Scan Tool
Readiness code, generating
Special tools and equipment
- VAG1551 Scan Tool (or VAG1552 mobile scan tool) with VAG1551/3 cable
- VAG1788/10 RPM adjuster
Test requirements
- Vehicle stationary
- For vehicles with automatic transmission, selector lever must be in -P- or -N-.
- All electrical consumers like, for example, lights and rear window heating must be switched off.
- Coolant temperature less than 50 °C, See Display group 04, display field 3
- Intake Air Temperature (IAT) less than 30 °C See Display group 04, display field 4
Work procedure
- Connect VAG 1551 scan tool (VAG1552). Then switch ignition on and select the Engine Control Module (ECM) using address word 01 (connecting scan tool and selecting ECM).
Work step 1: Check DTC Memory
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -2- to select "Check DTC Memory" function 02. Press -Q- button to confirm input.
Number of stored DTCs or "No DTC recognized" will be indicated on display.
x DTC recognized
If a DTC is stored:
- Repair malfunctions that were printed out using DTC table:
SAE P0-Codes. Testing and Inspection
SAE P1-Codes. Testing and Inspection
If no DTCs are stored:
- Press -> button.
Work step 2: Erase DTC Memory
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -5- to select "Erase DTC Memory" function 05. Press -Q- button to confirm input.
NOTE: The readiness code is reset/erased every time DTC memory is erased.
Indicated on display
Rapid data transfer ->
DTC Memory is erased!
NOTE: If ignition was switched off between the steps "Check DTC memory" and "Erase DTC memory", DTC memory will not be erased.
- Press -> button.
Work step 3: Temperature check
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block HELP
Input display group number XXX
- Press buttons -0-, -0- and -4- to select "Display group number 4". Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 4 ->
1 2 3 4
- Read coolant temperature value in display field 3.
Specification: maximum 50 °C
- Read Intake Air Temperature (IAT) value in display field 4.
Specification: maximum 30 °C
If indications resemble description:
- Start engine, and let it idle.
NOTE: Engine must not be shut off again during work sequence.
Indicated on display
Rapid data transfer HELP
Select function XX
Work step 4: Diagnostic of leak detection system
- Press buttons -0- and -4- to select "Basic Setting" function 04. Press -Q- button to confirm input.
Indicated on display
Basic Setting
Input display group number XXX
- Press buttons -0-, -7- and -1- to select "Display group number 71". Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Basic Setting 71 ->
1 2 3 4
- Continue to let engine run at idle.
If diagnostic is initiated by the Engine Control Module (ECM), the indication in display field 4 will jump from "Test OFF" to "Test ON".
- Continue to let engine run at idle until display field 4 indicates: "Sys. OK".
NOTE: If indication in display field 4 jumps from "Test ON" to "Test OFF" during the test and display field 2 indicates "Aborted", repeat "Leak detection diagnostic".
When diagnostic is repeated, it can last up to approx. 60 seconds before indication in display field 4 switches from "Test OFF" to "Test ON".
Work step 5: Diagnostic of tank ventilation system
Coolant temperature larger than 60 °C, See Display group 04, display field 3
- Press button -1- (VAG1551) or down arrow button (VAG1552).
Indicated on display (1-4 = display fields)
System in Basic Setting 70 ->
1 2 3 4
If diagnostic is initiated by the Engine Control Module (ECM), the indication in display field 4 will jump from "Test OFF" to "Test ON".
- Continue to let engine run at idle until display field 4 indicates: "TW OK"
If indications do not resemble description:
- Check DTC memory. Reading Diagnostic Trouble Codes
If indications resemble description:
- Press -C- button.
Work step 6: Diagnostic fuel system
Indicated on display
Basic Setting
Input display group number XXX
- Press buttons -1-, -0- and -7- to select "Display group number 107". Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
System in Basic Setting 107 ->
1 2 3 4
If diagnostic is initiated by the Engine Control Module (ECM), the indication in display field 4 will jump from "Test OFF" to "Test ON".
- Continue to let engine run at idle until display field 4 indicates: "Sys. OK"
If indications do not resemble description:
- Check DTC memory. Reading Diagnostic Trouble Codes
If indications resemble description:
- Press -C- button.
Work step 7: Diagnostic of Secondary Air Injection (AIR) system
Indicated on display
Basic Setting
Input display group number XXX
- Press buttons -0-, -7- and -7- to select "Display group number 77". Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
System in Basic Setting 77 ->
1 2 3 4
- Use VAG1788/10 RPM adjuster to adjust engine RPM to 1800 - 2200 RPM:
If diagnostic is initiated by the Engine Control Module (ECM), the indication in display field 4 will jump from "Test OFF" to "Test ON".
- Continue to let engine run at idle until display field 4 indicates: "Sys. OK"
If indications do not resemble description:
- Check DTC memory. Reading Diagnostic Trouble Codes
If indications resemble description:
- Press -C- button.
Work step 8: Diagnostic operational readiness of oxygen sensor behind catalytic converter
Indicated on display
Basic Setting
Input display group number XXX
- Press buttons -0-, -3- and -6- to select "Display group number 36".
- Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
System in Basic Setting 36 ->
1 2 3 4
- Continue to hold the RPM at 1800 - 2200 until display field 2 indicates the specified value: "B1-S2 OK".
If indications do not resemble description:
- Check DTC memory. Reading Diagnostic Trouble Codes
If indications resemble description:
- Press -> button.
Work step 9: Diagnostic of oxygen sensor aging before catalytic converter (monitoring period duration)
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
- Press buttons -0-, -3- and -4- to select "Display group number 34".
- Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 34 ->
1 2 3 4
- Hold the RPM until the catalytic converter temperature in display field 2 over 350 °C climbs.
- Press -C- button.
Indicated on display
Read Measuring Value Block
Input display group number XXX
- Press buttons -0-, -3- and -0- to select "Display group number 30". Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 30 ->
1 2 3 4
- Check operational condition of oxygen sensor control before catalytic converter (display field 1):
Specification: 111
- Check operational condition of oxygen sensor control behind catalytic converter (display field 2):
Specification: 11 x
Meaning of 3 digit number block in display fields 1 and 2
If specified values are not obtained:
- Check DTC memory. Reading Diagnostic Trouble Codes
If specified values are obtained:
- Press -> button.
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -4- to select "Basic Setting" function 04. Press -Q- button to confirm input.
Indicated on display
Basic Setting
Input display group number XXX
- Press buttons -0-, -3- and -4- to select "Display group number 34". Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
System in Basic Setting 34 ->
1 2 3 4
- Hold engine speed at 1800 - 2200 RPM until indication in display field 4 jumps from "Test OFF" to "Test ON".
Catalytic converter temperature in display field 2 must be 350-500 °C.
- Check period duration in display field 3:
Specification: maximum 3.3 s
- Continue to hold the RPM at 1800 - 2200 until display field 4 indicates: "B1-S1 OK"
If indications do not resemble description:
- Check DTC memory. Reading Diagnostic Trouble Codes
If indications resemble description:
- Remove VAG 1788/10 from accelerator pedal.
- Press -C- button.
Work step 10: Diagnostic of oxygen sensor control system
- Press buttons -0-, -3- and -7- to select "Display group number 37".
- Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
System in Basic Setting 37 ->
1 2 3 4
If diagnostic is initiated by the Engine Control Module (ECM), the indication in display field 4 will jump from "Test OFF" to "Test ON".
- Continue to let engine run at idle until display field 4 indicates: "Sys. OK"
If indications do not resemble description:
- Check DTC memory. Reading Diagnostic Trouble Codes
If indications resemble description:
- Press -C- button.
Work step 11: Diagnostic of oxygen sensor aging behind catalytic converter
- Press buttons -0-, -4- and -3- to select "Display group number 43". Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
System in Basic Setting 43 ->
1 2 3 4
- Use VAG 1788/10 RPM adjuster to adjust engine RPM to 1800-2200 RPM:
- Hold engine speed at 1800 - 2200 RPM until indication in display field 4 jumps from "Test OFF" to "Test ON".
Catalytic converter temperature in display field 2 must be at least 300 °C.
- Continue to hold the RPM at 1800 - 2200 until display field 4 indicates: "B1-S2 OK"
If indications do not resemble description:
- Check DTC memory. Reading Diagnostic Trouble Codes
If indications resemble description:
- Press -C- button.
Work step 12: Diagnostic of catalytic converter
NOTE: This diagnostic can only be completed if the diagnostic of oxygen sensor aging has already been performed successfully.
Indicated on display
Basic Setting
Input display group number XXX
- Press buttons -0-, -4- and -6- to select "Display group number 46". Press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
System in Basic Setting 46 ->
1 2 3 4
- Hold engine speed at 1800 - 2200 RPM until indication in display field 4 jumps from "Test OFF" to "Test ON".
Catalytic converter temperature in display field 2 must be at least 400 °C.
- Continue to hold the RPM at 1800 - 2200 until display field 4 indicates: "B1-S1 OK"
If indications do not resemble description:
- Check DTC memory. Reading Diagnostic Trouble Codes
If indications resemble description:
- Press -> button.
- Remove VAG 1788/10 from accelerator pedal.
- Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
- Read readiness code.
Generating readiness code, work steps 1-6
Generating readiness code, work steps 7-12
