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With Manufacturer's Scan Tool




Function
First of all, the old learned values are erased. This is necessary to set learned values, which may be at the limit, to a neutral (Diagnostic Trouble Code (DTC) position. The adaptation teaches the Motronic Engine Control Module (ECM) -J220- the various positions of the throttle unit when the ignition is switched on and the engine is not running. These positions are stored in the control module.

Adapting sequence must be performed if:
- The voltage supply is interrupted
- The Throttle Valve Control Module -J338- has been removed and installed or possibly cleaned
- The Throttle Valve Control Module -J338- is replaced
- If when installing another engine another Throttle Valve Control Module -J338- is installed
- The Motronic Engine Control Module (ECM) -J220- is replaced
- Faulty components such as Oxygen Sensor (O2S)s or fuel injectors have been replaced.

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required







- VAG 1551 Scan tool (or VAG 1552) with VAG 1551/3 adapter cable

NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.

Test prerequisites







- The fuses must be OK.
- The battery voltage must be at least 11.5 V.
- All electrical accessories, e.g. lights and rear window heating must be switched off.
- If the vehicle is equipped with air conditioning, it must be turned off.
- Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
- The throttle valve must be at idle speed position (accelerator must not be depressed during test).
- The throttle valve must not be soiled (carbon deposits).
- No Diagnostic Trouble Code (DTC)s must be stored in DTC memory.
- Coolant temperature must be 5 to 110 degrees C. See display group 4, display zone 3.


Work sequence
- Connect VAG 1551 Scan tool (or VAG 1552). Then switch ignition on and select Motronic Engine Control Module (ECM) -J220- with the "Address word" 01. ((VAG 1551 and Motronic Engine Control Module (ECM) -J220-, connecting and selecting).

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -1- and -0- for function "Adaption" and confirm entry with -Q- button.

Indicated on display:


Adapting
Feed in channel number XX


- Press button -0- button twice-for "Channel number 0" and confirm entry with -Q- button.

Indicated on display:


Adaption Q
Erase learned values?


- Confirm input with -Q- button.

Indicated on display:


Adaption ->
learned values have been erased


- Press the -> button.

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -4- for function "Initiate 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.x % xxx.x % x ADP. runs


After pressing the -Q- button the throttle valve positioner is switched so that it is not supplied with voltage.

In this condition the throttle valve is pulled into an emergency running position by a mechanical spring in the Throttle Valve Control Module -J338-. The values that both angle sensors provide in the emergency running position are stored by the Motronic Engine Control Module (ECM) -J220-.

Thereafter the throttle valve is opened a predetermined value. If this value is achieved, the throttle valve is again switched so that it is not supplied with voltage. Now the mechanical spring must pull the throttle valve to the previously learned emergency running position within a predetermined period (spring test).

Then the throttle valve is closed by the throttle valve positioner and the values, which are supplied by the angle sensors in the Throttle Valve Control Module -J338- are stored by the Motronic Engine Control Module (ECM) -J220-.

If the Motronic Engine Control Module (ECM) -J220- switches the throttle valve positioner so that it is without voltage during normal operation, this is indicated by the increased and hunting idle speed. The engine reacts slowly to accelerator changes.

- Check specifications in display zones 3 and 4:
Display zone 3: 0 to 8
Display zone 4: ADP. runs, ADP. 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 the button.

Adaptation has been performed successfully.

To store the values:
- Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
- Switch off ignition.

NOTE:
If the basic setting of the control module is aborted, the cause could be one of the following:
- The prerequisites have not been fulfilled.
- Throttle Valve Control Module -J338- or wiring is faulty.

After aborting, a Diagnostic Trouble Code (DTC) is stored in DTC memory. When next switching on ignition the basic setting is automatically performed again.
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