ECM, Adapting to Throttle Valve Control Module
The adaptation teaches the Engine Control Module (ECM) various positions of the throttle valve when the ignition is on and the engine is stopped. These positions are stored in the control module Throttle valve position feedback takes place through the two throttle valve drive angle sensors.
The adaptation must be performed if:
- the supply voltage has been interrupted
- the throttle valve control unit has been removed and reinstalled
- the throttle valve control module has been replaced
- another engine has been installed, and another throttle valve control module along with it
Special tools and equipment
- VAG1551 scan tool (or VAG1552 mobile scan tool) with VAG1551/3B cable
Test requirement
- There must not be any DTCs stored in DTC memory.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers like, for example, lights and rear window heating must be switched off.
- Throttle valve must be in Closed Throttle Position (CTP)
Procedure
- Connect VAG1551 scan tool (VAG1552). Then switch ignition on and select the Engine Control Module (ECM) using address word 01.
Connecting scan tool and selecting ECM.
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
Enter display group number XXX
- Press 0, 6 and 0 for the function "display group number 60", and then press Q to exit from input mode.
Indicated on display: (1 to 4 = display fields)
System in basic setting 60 ->
1 2 3 4
After pressing Q-button, throttle valve actuator will be switched on without current.
In this condition, the throttle valve will be drawn into an emergency position by a mechanical spring, which is located in the throttle valve control unit. The values supplied by the two angle sensors in this emergency position are stored by the Engine Control Module (ECM).
Next, the throttle valve is opened by a certain value. If this value is reached, the throttle valve actuator is once again de-energized. Now, the mechanical spring must close the throttle valve to the previously learned emergency position within a specified time (spring test).
Then, the throttle valve is closed by the throttle valve actuator; the values supplied by the angle sensors in the throttle valve control unit are stored by the Engine Control Module (ECM).
If Engine Control Module (ECM) should de-energize throttle valve actuator during driving operation, this is expressed by an increased, surging idle speed (RPM). The engine accepts gas only after great delay.
- Check specified values (display fields 1 through 4):
Indicated on display: (1 to 4 = display fields)
System in basic setting 60 ->
1 2 3 4
- Do not end adaptation by pressing the -> button, until it has been in progress for at least 30 seconds.
The adaptation has been successfully completed.
To store the values:
- Switch ignition off.
NOTE: The control module can abort basic adjustment for the following reasons:
- The throttle valve is not reaching the mechanical idle stop due to dirt, e.g, carbon buildup.
- Battery voltage is too low.
- Throttle valve control module or wire connection is faulty, checking.
After a cancellation, a DTC is entered in DTC memory. The next time the ignition is switched on, basic adjustment will be automatically
repeated.
- End basic adjustment of the engine by pressing the -> key.
- Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
- Switch ignition off.
- Read readiness code. If DTC memory was erased or the Engine Control Module (ECM) was disconnected from the continuous B+ supply, the readiness code must be re-generated.