Throttle Valve Control Module, Adapting
Throttle Valve Control Module, Adapting
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 The return communication regarding the position of the throttle valve occurs via the two angle sensors for throttle drive.
An adaptation must always be performed when the throttle valve control module -J338- or the Engine Control Module (ECM) are removed and installed (or replaced) or if voltage supply to the Engine Control Module (ECM) is interrupted.
The learning process (adaptation) occurs:
- automatically if the ignition is switched on for at least 10 seconds without operating starter and accelerator pedal and the Engine Control Module (ECM) recognizes "adaptation required". (There will be no notification of whether adaptation was successful or not however). Adaptation required is recognized if stored voltage values from the angle sensors do not match actual measured voltage values within a certain tolerance range.
- via initiation of basic setting (function 04) display group 060 with ignition on.
NOTE: Engine will not start during automatic adaptation.
Special Tools and Equipment
- VAS5051 with VAG5051/1
or
- VAG1551 with VAG1551/3B
Requirements
- No DTCs in DTC memory, check DTC memory.
- Engine not running, ignition switched on.
- Accelerator pedal not depressed.
- Coolant temperature 10 to 95 ° C.
- Intake air temperature 10 to 90 ° C.
- Supply voltage for ECM larger than 12.7 V. Testing and Inspection
Procedure
- Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01. Refer to Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551/VAS 5051 Scan Tool Testing and Inspection
Ignition must remain switched on for this.
When indicated on display:
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -4- to select "Initiate basic setting" and press -Q- button to confirm input.
When indicated on display:
Basic Setting Q
Input display group number XXX
- Press buttons -0-, -6- and -0- to select "display group number 060" and press -Q- button to confirm input.
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 module. 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.
When indicated on display:
System in Basic Setting 60 ->
1 2 3 4
- Check specified values for throttle valve control module in display fields 3 and 4.
Display group 060:
NOTE:
The control module can abort adaptation for the following reasons:
- Throttle valve cannot be closed completely (e.g. contamination)
- Battery voltage is too low,
- Throttle valve control module or wire connection is faulty.
- Engine is started during adaptation or accelerator pedal is operated.
- Tension of throttle valve housing (check bolts)
After termination, tester displays "Function is unknown or cannot be performed at the moment". The next time the ignition is switched on (several seconds), adaptation will be automatically repeated.
- End basic adjustment of the engine by pressing the -> key.
Indicated on display (function selection):
Rapid data transfer HELP
Select function XX