ECM, Adapting to Throttle Valve Control Module
Engine Control Module (ECM) To Throttle Valve Control Module, Adapting
The adaptation teaches the engine control module 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 senders for throttle valve drive.
Adapting sequence must be performed if:
- The voltage supply is interrupted
- The throttle valve control module is removed and installed
- The throttle valve control module is replaced
- If when installing another engine another throttle valve control module is installed
Special tools, test equipment and auxiliary items
- Scan tool V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3B
Check conditions
- No DTCs must be stored in DTC memory.
- The battery voltage must be at least 11.5 V
- All electrical consumers, e.g. lights and rear window heating must be switched off
- The throttle valve must be at idle speed position
Work sequence
- Connect the scan tool V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control module with the "Address word" 01.
Indicated on display
Rapid data transfer HELP
Select function XX
- Press keys 0 and 4 for the function "Basic Setting" and confirm entry with Q key.
Indicated on display
Basic setting
Input display group number XXX
- Press keys 0, 6 and 0 for the "Display group number 60" and confirm entry with Q key.
Indicated on display (1-4 = Display zones)
System in basic setting 60 ->
1 2 3 4
After pressing the Q key 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. The values from both angle senders 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 senders in the throttle valve control module are stored by the engine control module.
If the engine control module 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 the specifications (display zones 1-4):
Display Group 60:
- Terminate engine basic setting at earliest after 30 seconds by pressing the -> key.
Matching 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:
- Throttle valve cannot reach the mechanical idle speed stop because of contamination e.g. oil deposits.
- Battery voltage too low.
- Throttle valve control module is malfunctioning or there is a malfunction in the wiring.
After an interruption a DTC is stored in DTC memory. When next switching on ignition the basic setting is automatically performed again.
- End the engine basic setting by pressing the -> key.
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Switch off ignition.