With Manufacturer's Scan Tool
Readiness code, generating
Special tools, test equipment and auxiliary items
- VAG 1551 scan tool (or vehicle system tester VAG 1552) with cable VAG 1551/3B
Test conditions
- All fuses must be OK
- Vehicle stationary
- The battery voltage must be at least 11.5 V
- All electrical consumers, e.g. lights and rear window heating must be switched off.
- Coolant temperature must be at least 80 °C, see display group 04, display zone 3.
- Intake air temperature less than 60 °C, see display group 04, display zone 4
- The catalyst temperature must be at least 250 °C and below 740 °C, see Display group 34, display zone 2
- On vehicles with automatic transmission selector lever in "P"or "N" position
Work sequence
- Connect VAG 1551 or 1552 Scan Tool.
Switch ignition on and select "Address word" 01. Connecting scan tool and selecting engine control module. [1][2][3]Connecting VAG 1551 Scan Tool
Work step 1: Check DTC memory
- Switch ignition on (engine not running).
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons 0 and 2 for function "Check DTC memory" and confirm entry with Q button.
The number of DTCs stored or "No DTC recognized!" will be shown on the display.
X DTC recognized!
If a DTC is stored:
- Repair malfunctions printed out as DTCs using Diagnostic Trouble Code (DTC) table
- SAE P0 codes SAE P0 Codes
- SAE P1 codes SAE P1 Codes
If no DTC is stored:
- Press -> button.
Work step 2: Clear DTC memory
- Switch ignition on (engine not running).
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons 0 and 5 for function "Erase DTC memory" and confirm entry with Q button.
NOTE: The readiness code is reset or erased each time DTC memory is erased.
Indicated on display
Rapid data transfer
DTC memory Is erased!
NOTE: If the ignition is switched off between "Check DTC memory" and "Erase DTC memory" the DTC memory will not be erased.
- Press -> button.
Work step 3: Matching the throttle valve control module to the engine control module
- Switch ignition on (engine not running).
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons 0 and 4 for function "Basic Setting" and confirm entry with Q button.
Indicated on display
Basic setting
Input display group number XXX
- Press buttons 0, 6 and 0 for "Display group number 60" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
System in basic setting 60 ->
xxx% xxx% x ADP.runs
- Check specifications in display zones 3 and 4:
Display zone 3: 0 to 8
Display zone 4: ADAP. runs, ADAP. OK
Indicated on display: (1 to 4 = Display zones)
System in basic setting 60 ->
xxx% xxx% 8 ADP.OK
- Terminate engine basic setting at earliest after 30 seconds by pressing C-button.
Work step 4: Leak detection system diagnosis
- Vent fuel tank before diagnostic by briefly opening and closing filler cap.
- Press buttons 2, 0 and 2 for "Display group number 202" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
System in basic setting 202 ->
1 2 3 4
- Allow engine to run at idle speed until
Specification: x x 0 x x 1 x 0
appears in display zone 4 after about 120 seconds.
NOTE:
- In case of malfunction, the message "fine leak" or "large leak" appears in display field 3.
- If "Abort" appears in display field 3, repeat leak diagnostic.
- Filler cap of fuel tank must be opened briefly before repeating diagnostic.
- Engine must not be switched again off during work sequence.
If the display does not indicate as described:
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press -> button.
Work step 5: Knock sensor diagnosis
- Carry out test drive with a 2nd person to observe display
Observe safety precautions during a test drive.
Observe test conditions.
- Start engine and select engine control module with "Address word" 01. When doing this engine must be running at idle speed. Connecting scan tool and selecting engine control module. [1][2][3]Connecting VAG 1551 Scan Tool
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons 0 and 8 for function "Read measuring value block" and confirm entry with Q button.
Indicated on display
Read measuring value block
Input display group number XXX
- Press buttons 2, 0 and 3 for "Display group number 203" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
Read measuring value block 203 ->
1 2 3 4
- Observe display in display zone 4.
- Accelerate vehicle to an engine speed above 3000 RPM.
- Allow engine to run at 3000 RPM until
Specification: x x x x x 1 0 0
is displayed in display zone 4.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 6: Vehicle speed diagnosis
Indicated on display:
Read measuring value block
Input display group number XXX
- Press buttons 2, 0 and 4 for "Display group number 204" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
Read measuring value block 204 ->
1 2 3 4
- Observe display in display zone 4.
- Accelerate vehicle to an engine speed above 3000 RPM.
- Close throttle valve abruptly.
Specification following overrun phase in
Display zone 4:x x x x x 1 0 0
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press -> button.
NOTE:
- Steps 7 through 14 can be performed while the accelerator and brake pedals are continually depressed if each step is successful.
- To change to another display group proceed as follows:
Work step 7: Heated oxygen sensor before catalyst (Bank1) diagnosis
- Leave engine running at idling speed.
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons 0 and 4 for function "Introduction of basic setting" and confirm entry with Q button.
Indicated on display
Basic setting
Input display group number XXX
- Press buttons 2, 0 and 5 for "Display group number 205" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
Read measuring value block 205 ->
1 2 3 4
- Observe display in display zone 4.
- Depress brake pedal and hold.
- Press accelerator pedal to wide open throttle position.
The engine speed is increased by the control module to approx. 2300 RPM.
- Allow engine to run at increased speed until
Specification: x x x x x 1 0 0
appears in display zone 4.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 8: Oxygen sensor before catalyst aging diagnosis (sensor dynamics)
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2,1 and 2 for "Display group number 212" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
System in basic setting 212 ->
1 2 3 4
- Observe display in display zone 4.
- Depress brake pedal and hold.
- Press accelerator pedal to wide open throttle position.
The engine speed is increased by the control module to approx. 2300 RPM.
- Allow engine to run at increased speed until
Specification: x x x x x 1 0 0
appears in display zone 4 after about 50 seconds.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 9: Fuel mixture diagnosis (partial load), Bank 1
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2,1 and 6 for "Display group number 216" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
Read measuring value block 216 ->
1 2 3 4
- Observe display in display zone 4.
- Depress brake pedal and hold.
- Press accelerator pedal to wide open throttle position.
The engine speed is increased by the control module to approx. 2300 RPM.
- Allow engine to run at increased speed until
Specification: x x x x x 1 0 0
appears in display zone 4 after about 70 seconds.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 10: Air mass filling detection diagnosis
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2,1 and 8 for "Display group number 218" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
Read measuring valve block 218 ->
1 2 3 4
- Observe display in display zone 4.
- Depress brake pedal and hold.
- Depress accelerator pedal to wide open throttle position
Engine speed is increased by control module to approx. 2300 RPM.
- Allow engine to run at increased speed until
Specification: 0 0 0 0 0 x 0 0 appears in display zone 4
NOTE:
This process can take a few minutes. If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 11: Heated oxygen sensor after catalyst diagnosis, Bank 1
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2,1 and 9 for "Display group number 219" and confirm entry with Q. button.
Indicated on display: (1 to 4 = Display zones)
Read measuring value block 219 ->
1 2 3 4
- Leave engine running at idling speed.
- Observe display in display zone 3.
- The displayed value in display field 3 (catalyst temperature) must be between 200 °C and 600 °C. If catalyst temperature is too high, let vehicle cool off.
- Observe display in display zone 4.
- Depress brake pedal and hold.
- Depress accelerator pedal to wide open throttle position
The engine speed is increased by the control module to approx. 2300 RPM.
- Allow engine to run at increased speed until
Specification: x x x x x 1 0 0
appears in display zone 4.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 12: Oxygen sensor voltage after catalyst diagnosis, Bank 1
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2, 2 and 1 for "Display group number 221" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
Read measuring value block 221 ->
1 2 3 4
- Observe display in display zone 3.
- The displayed value in display field 3 (catalyst temperature) must be between 200 °C and 600 ° C. If catalyst temperature is too high, let vehicle cool off.
- Observe display in display zone 4.
- Depress brake pedal and hold.
- Depress accelerator pedal to wide open throttle position
The engine speed is increased by the control module to approx. 2300 RPM.
- Allow engine to run at increased speed until
Specification: 0 0 0 x x 1 0 0
appears in display zone 4 after about 30 seconds.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 13: Swapping detection of oxygen sensors after catalyst, diagnosis
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2, 2 and 4 for "Display group number 224" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
Read measuring value block 224 ->
1 2 3 4
- Observe display in display zone 4.
- Depress brake pedal and hold.
- Depress accelerator pedal to wide open throttle position
The engine speed is increased by the control module to approx. 2300 RPM.
- Allow engine to run at increased speed until
Specification: x x x x x 1 0 0
appears in display zone 4 after about 15 seconds.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 14: Oxygen sensor after catalyst aging diagnosis, Bank 1 (sensor dynamics)
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2, 2 and 6 for "Display group number 226" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
Read measuring value block 226 ->
1 2 3 4
- Observe display in display zone 3.
- The displayed value in display zone 3 (catalyst temperature) must be between 450 °C and 740 ° C. If catalyst temperature is too high, let vehicle cool off.
- Observe display in display zone 4.
- Depress brake pedal and hold.
- Depress accelerator pedal to wide open throttle position
The engine speed is increased by the control module to approx. 2300 RPM.
- Allow engine to run at increased speed until
Specification: x x x x x 1 0 0
appears in display zone 4.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
NOTE: The following work steps are performed at idle RPM..
Work step 15: Fuel mixture at idle, Bank 1 diagnosis
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2,1 and 6 for "Display group number 216" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
System in basic setting 216
1 2 3 4
- Allow engine to run at idle speed until
Specification: x x x x 1 1 0 0
appears in display zone 4 after about 30 seconds.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 16: EVAP canister system (tank ventilation system) diagnosis
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2, 2 and 8 for "Display group number 228" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
System in basic setting 228 ->
1 2 3 4
- Observe display in display zone 4.
- Allow engine to run at idle speed until
Specification: x x x x x 1 0 0
appears in display zone 4 after about 30 seconds.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 17: Secondary air system diagnosis, Bank 1
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2, 2 and 9 for "Display group number 229" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
System in basic setting 229
1 2 3 4
- Observe display in display zone 4.
- Allow engine to run at idle speed until
Specification: x x x x x 1 0 0
appears in display zone 4 after about 30 seconds.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
Work step 18: Fuel mixture at idle, Bank 1 diagnosis
Indicated on display:
Basic setting
Input display group number XXX
- Press buttons 2, 3 and 1 for "Display group number 231" and confirm entry with Q button.
Indicated on display: (1 to 4 = Display zones)
System in basic setting 231 ->
1 2 3 4
- Observe display in display zone 4.
- Allow engine to run at idle speed until
Specification: x x x x x 1 0 0
appears in display zone 4 after about 30 seconds.
If the display does not indicate as described:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes
If the display indicates as described:
- Press C button.
- Press buttons 0 and 6 for function "End output" and confirm entry with Q button.
- Switch off ignition.
Work step 19: Read readiness code
- Read readiness code Readiness Code Reading