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With Manufacturer's Scan Tool




Motronic Engine Control Module (ECM) -J220- To Throttle Valve Control Module -J338-, Adapting

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. The feedback of the throttle valve position is via both angle sensors for throttle valve drive.

Adapting sequence must be performed if:
- Voltage supply is interrupted
- Throttle Valve Control Module -J338- is removed and installed
- Throttle Valve Control Module -J338- is replaced
- If when installing another engine another Throttle Valve Control Module -J338- is installed
- Motronic Engine Control Module (ECM) -J220- is replaced.


NOTE: On vehicles with an automatic transmission, the transmission control module must also be adapted.


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

Test conditions
- No DTCs must be stored in DTC memory, Checking and Erasing DTC Memory. Reading Diagnostic Trouble Codes
- Battery voltage must be at least 11.5 V
- All electrical accessories, e.g. lights and rear window defroster must be switched off
- The throttle valve must be at idling speed position (The accelerator must not be operated during the test).
- Throttle valve must not be dirty (carbonization).
- Engine Coolant Temperature (ECT) must be 5 to 95 °C display group 04, display zone 3.
- The cruise control system must be functioning correctly if installed.

Work sequence
- Connect VAG 1551 scan tool ((VAG 1552). 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

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 ->
1 2 3 4


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

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 from both angle sensors in the emergency running position are stored by the ECM.

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 time (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 (display zones 1 to 4):







- Terminate engine basic setting at earliest after 30 seconds by pressing -> button.
Adapting has been performed successfully.

To store the values:
- Switch off ignition.


NOTE:
- If the basic setting of the control module is interrupted, the cause could be one of the following:
- The test conditions were not fulfilled.
- Throttle valve cannot reach the mechanical idle speed stop because of contamination e.g. oil deposits.
- Throttle Valve Control Module is malfunctioning or there is a malfunction in the wiring, checking. Throttle Valve Control Module, Checking
- After an interruption a DTC is stored in DTC memory. When next switching on ignition the basic setting is automatically performed again.


- End engine basic setting by pressing -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button.
- Switch off ignition.
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