Programming and Relearning
During adaptation with ignition switched on and engine off, the Engine Control Module (ECM) learns the various positions of the throttle valve. 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:
- Via initiation of Basic Setting (function 04) display group 60 with ignition on.
- Automatically if the ignition is switched on for at least 6 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.
NOTE: Engine will not start during automatic adaptation.
Special tools and equipment
- VAS5051 with VAG 5051/1
or
- VAG 1551 with VAG 1551/3A
Requirements
- No DTCs in DTC memory; check DTC memory.
- Engine not running, ignition switched on
- Accelerator pedal not depressed
- Coolant Temperature more than 5 °C but less than 100 °C. (Read Measuring Value Block, display group 4, display field 3)
- Intake Air Temperature (IAT) less than 100 °C (Read Measuring Value Block, display group 4, display field 4)
- Supply voltage for ECM larger than 11 V; checking. Refer to "Control Module Voltage Supply, Checking" Testing and Inspection
Procedure
- Connect VAS5051 tester or VAG 1551 scan tool and select control module for engine electronics using "address word" 01.
- 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 "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 mechanically (i.e. 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 that both angle sensors deliver in this emergency position are stored by the Engine Control Module (ECM).
After this, the throttle valve is opened by a specific value. Once this value is reached, the throttle valve actuator will be switched on again without current. Then the mechanical spring closes the throttle valve to the previously learned emergency position within a certain time (spring test).
Finally, the throttle valve is closed by the throttle valve actuator; the values that the angle sensors deliver in the throttle valve control module are stored in the ECM.
If the ECM switches the throttle valve actuator during driving operation without current, this is indicated by a heightened, uneven idle speed. The engine accepts gas only after great delay.
Indicated on display:
Basic Setting 60 ->
1 2 3 4
- Check specified values for throttle valve control module in display fields 3 and 4.
Display Group 60:
NOTE: Possible reasons for the control module to abort the adaptation procedure:
- Throttle valve cannot be closed completely (e.g. contamination).
- Battery voltage is too low.
- Throttle valve control module or wire connection is malfunctioning.
- Engine is started during adaptation or accelerator pedal is operated.
- Tension of throttle valve housing (check bolts).
- End Basic Setting of engine by pressing button.
Indicated on display (function selection):
Rapid data transfer HELP
Select function XX