With Manufacturer's Scan Tool

Readiness Code, Generating

Special tools, test equipment and auxiliary items
- VAG 1551 Scan tool (or VAG 1552 mobile scan tool) with cable VAG 1551/3B






- VAG 1788/10 Engine speed adjuster

Test conditions
- Vehicle stationary
- The battery voltage must be at least 11.5 V
- On vehicles with automatic transmission selector lever in "P" or "N" position






- All fuses must be OK.
- All electrical accessories, e.g. lights and rear window heating must be switched off
- Engine Coolant Temperature (ECT) must be 60 to 80 °C, see display group 04, display zone 3
- Intake Air Temperature (IAT) less than 60 °C, see display group 04, display zone 4

NOTE: If within a work step the test result is shown as "OK" immediately after selecting a display group, then the test has already been performed and the next work step can be selected.

Work sequence
- Connect scan tools VAG 1551 or VAG 1552. Then switch ignition on and select Motronic Engine Control Module (ECM) -J220- with "Address word" 01. Connecting scan tool and selecting Motronic Engine Control Module (ECM) -J220-. [1][2][3]Connecting VAG 1551 Scan Tool

Work step 1: Check DTC memory

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. P Code Charts
- SAE P1 codes. P Code Charts

If no DTC is stored:
- Press -> button.
- Continue with work step 3.

Work step 2: Erase DTC memory

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: Adapting the Throttle Valve Control Module -J338- to the Motronic Engine Control Module (ECM) -J220-

Test conditions
- Engine not running, ignition switch on

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -4- for the 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 the "Display group number 60" and confirm entry with -Q- button.

Indicated on display (1-4 = Display zones)

System in basic setting 60 ->
1 2 3 4

- Check the specifications in display zone 3 and 4:






If the display does not indicate as described:
- Press -> button.
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory, checking and erasing DTC memory. Reading Diagnostic Trouble Codes
- Check Throttle Valve Control Module -J338-. Throttle Valve Control Module, Checking

If the display indicates as described:
- Terminate engine basic setting at earliest after 30 seconds by pressing -> button.
- Start engine and run at idle speed.

NOTE: During the work sequence the engine must not be switched off.

Work step 4: Temperature check

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- for the function "Read measured value block" and confirm entry with -Q- button.

Indicated on display:

Read measured value block
Input display group number XXX

- Press buttons -0-, -0- and -4- for "Display group number 4" and confirm entry with -Q- button.

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

Read measured value block 4 ->
1 2 3 4

- Read coolant temperature value in display zone 3.
Specification: 60...80 °C
- Read Intake Air Temperature (IAT) value in display zone 4.
Specification: maximum 60 °C

If the specifications are not obtained:
- Press -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button.
- Switch off ignition and allow engine to cooled down.
- Repeat readiness code.

If the display indicates as described:
- Press -> button.

Indicated on display

Rapid data transfer HELP
Select function XX

Work step 5: Leak detection system
- Press buttons -0- and -4- for the "Basic Setting" function and confirm entry with -Q- button.

Indicated on display

Basic setting
Input display group number XXX

- Press buttons -0-, -7- and -1- for "Display group number 71" and confirm entry with -Q- button.

Indicated on display (1-4 = Display zones)

System in basic setting 71 ->
1 2 3 4

- Allow engine to run at idle speed.
If the diagnostic is initiated from Motronic Engine Control Module (ECM) -J220- the display in display zone 4 jumps from "Test OFF" to "Test ON."
- Continue to run engine at idle speed until specification "Syst. OK" is displayed in display zone 4.






NOTE:
- If the display in display zone 4 jumps from "Test ON" to "Test OFF" during the diagnostic and "Abort" is displayed in display zone 2, repeat the "Leak diagnostic."
- The fuel tank cap must be opened briefly before repeating the diagnostic.
- When repeating the diagnosis it can take up to approx. 60 seconds before the display in display zone 4 jumps from "Test OFF" to "Test ON".

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.

Work step 6: Oxygen status diagnostic

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- for the function "Read measured value block" and confirm entry with -Q- button.

Indicated on display:

Read measured value block
Input display group number XXX

- Press buttons -0-, -3- and -0- for "Display group number 30" and confirm entry with -Q- button.

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

Read measured value block 30 ->
1 2 3 4

- Check operating condition of oxygen sensor control before Three Way Catalytic Converter (TWC) (display zone 1):
Specification: x11
- Check operating condition of the oxygen sensor control after Three Way Catalytic Converter (TWC) (display zone 2):
Specification: xxx

NOTE: The bits in display zone 2 will not be set to 1 until the Three Way Catalytic Converter (TWC) temperature rises above 350 °C (See Display group 34, display zone 2).

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






If the specifications are not obtained:
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes

If the specifications are obtained:
- Press -> button.

Indicated on display

Rapid data transfer HELP
Select function XX

Work step 7: Diagnostic of fuel system
- Press buttons -0- and -4- for the "Basic Setting" function and confirm entry with -Q- button.

Indicated on display:

Basic setting
Input display group number XXX

- Press buttons -1-, -0- and -7- for "Display group number 107" and confirm entry with -Q- button.

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

System in basic setting 107 ->
1 2 3 4

- Allow engine to run at idle speed.
If the diagnosis is initiated from Motronic Engine Control Module (ECM) -J220- the display in display zone 4 jumps from "Test OFF" to "Test ON"
- Continue to run engine at idle speed until specification "Syst. OK" is displayed 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 (O2S) aging diagnostic before Three Way Catalytic Converter (TWC) (cycle duration monitor)

Indicated on display

Basic setting
Input display group number XXX

- Press buttons -0-, -3- and -4- for "Display group number 34" and confirm entry with -Q- button.

Indicated on display (1-4 = Display zones)

System in basic setting 34 ->
1 2 3 4

- Check specifications in display zones 1-4.
- Set an engine speed of 1800-2200 RPM with speed regulator VAG 1788/10.
- Maintain engine speed at 1800-2200 RPM until Three Way Catalytic Converter (TWC) temperature in display zone 2 increases to above 350 °C.
If the diagnostic is initiated from Motronic Engine Control Module (ECM) -J220- the display in display zone 4 jumps from "Test OFF" to "Test ON."
- Check cycle duration in display zone 3:
Specification: maximum 1.99
- Continue to maintain speed at 1800-2200 RPM until specification "B1-S1 OK" appears in display zone 4.






If the display does not indicate as described:
- Remove engine speed adjuster VAG 1788/10 from accelerator pedal.
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes

If the display indicates as described:
- Press -C- button.

Work step 9: Diagnostic of operational readiness for the Oxygen sensor after Three Way Catalytic Converter (TWC)

Indicated on display:

Basic setting
Input display group number XXX

- Press buttons -0-, -3- and -6- for "Display group number 36" and confirm entry with -Q- button.

Indicated on display:

System in basic setting 36 ->
1 2

- Check specifications in display zones 1-2.
- Maintain engine speed at 1800-2200 RPM.
If the diagnostic is initiated from Motronic Engine Control Module (ECM) -J220- the display in display zone 2 jumps from "Test OFF" to "Test ON."
- Continue to 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.
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes

If the display indicates as described:
- Press -C- button.

Work step 10: Diagnostic of Oxygen sensor (O2S) aging after Three Way Catalytic Converter (TWC)

Indicated on display:

Basic setting
Input display group number XXX

- Press buttons -0-, -4- and -3- for "Display group number 43" and confirm entry with -Q- button.

Indicated on display:

System in basic setting 43 ->
1 2 3 4

- Check specifications in display zones 1-4.
- Maintain engine speed at 1800-2200 RPM until Three Way Catalytic Converter (TWC) temperature in display zone 2 increases to above 300 °C.
If the diagnostic is initiated from Motronic Engine Control Module (ECM) -J220- the display in display zone 4 jumps from "Test OFF" to "Test ON."
- 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 VAG 1788/10 from accelerator pedal.
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes

If the display indicates as described:
- Press C button.

Work step 11: Diagnostic of oxygen sensor control system

Indicated on display:

Basic setting
Input display group number XXX

- Press buttons -0-, -3- and -7- for "Display group number 37" and confirm entry with -Q- button.

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

System in basic setting 37 ->
1 2 3 4

- Maintain engine speed at 1800-2200 RPM.
If the diagnostic is initiated from Motronic Engine Control Module (ECM) -J220- 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 the display does not indicate as described:
- Remove engine speed adjuster VAG 1788/10 from accelerator pedal.
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes

If the display indicates as described:
- Press -C- button.

Work step 12: Three Way Catalytic Converter (TWC) diagnostic

NOTE: The diagnostic will only be terminated if the Oxygen sensor (O2S) aging diagnostic is first successfully completed.

Indicated on display

Basic setting
Input display group number XXX

- Press buttons -0-, -4- and -6- for "Display group number 46" and confirm entry with -Q- button.

Indicated on display (1-4 = Display zones)

System in basic setting 46 ->
1 2 3 4

- Maintain engine speed at 1800-2200 RPM until Three Way Catalytic Converter (TWC) temperature in display zone 2 increases to above 440 °C.
If the diagnostic is initiated from Motronic Engine Control Module (ECM) -J220- the display in display zone 4 jumps from "Test OFF" to "Test ON."
- Check Three Way Catalytic Converter (TWC) conversion (amplitude condition) in display zone 3:
Specification:
- Max 0.20
- Continue to maintain speed at 1800-2200 RPM until specification "Cat B1 OK." appears in display zone 4.

NOTE: This process can take a few minutes.






If the display does not indicate as described:
- Remove engine speed adjuster VAG 1788/10 from accelerator pedal.
- Press -> button.
- Check DTC memory. Reading Diagnostic Trouble Codes

If the display indicates as described:
- Remove engine speed adjuster VAG 1788/10 from accelerator pedal.
- Press -C- button.

Work step 13: Evaporative Emission (EVAP) system diagnostic (EVAP Canister Purge Regulator Valve -N80- system)

NOTE: The engine must not be loaded during this diagnostic because the diagnostic will be interrupted and will not be started again until the engine is revved-up.

Indicated on display

Basic setting
Input display group number XXX

- Press buttons -0-, -7- and -0- for "Display group number 70" and confirm entry with -Q- button.

Indicated on display (1-4 = Display zones)

System in basic setting 70 ->
1 2 3 4

- Allow engine to run at idle speed.
If the diagnostic is initiated from Motronic Engine Control Module (ECM) -J220- the display in display zone 4 jumps from "Test OFF" to "Test ON."
- Continue to run engine at idle speed until specification "EVAP OK." is displayed 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 14: Secondary air system diagnostic

Indicated on display

Basic setting
Input display group number XXX

- Press buttons -0-, -7- and -7- for the "Display group number 77" and confirm entry with -Q- button.

Indicated on display (1-4 = Display zones)

System in basic setting 77 ->
1 2 3 4

- Allow engine to run at idle speed.
If the diagnostic is initiated from Motronic Engine Control Module (ECM) -J220- the display in display zone 4 jumps from "Test OFF" to "Test ON."
- Continue to run engine at idle speed until specification "Syst.OK." is displayed 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 -> button.

Work step 15: Read readiness code
- Read readiness code. Readiness Code Reading

Generating readiness code for engine codes AWP and AWV, work steps 1 to 5

Work Step 1 - 5:

Generating readiness code for engine codes AWP and AWV, work steps 6 to 10

Work Step 6 - 10:

Generating readiness code for engine codes AWP and AWV, work steps 11 to 15

Work Step 11 - 15: