TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
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Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.
Indicated on display:
Read Measuring Value Block
Q
Input display group number XXX
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Press buttons -0-, -6- and -2- to select "display group number 062" and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block 62
->
1
2
3
4
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Check specified value for E-Gas potentiometer voltages.
Display Group 062
NOTE: Engine Control Module (ECM) calculates the voltage values of the angle sensors in percent relative to 5 volts and displays these percentage
values. (5 volts supply voltage represents 100 %).
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Observe display field 1 and 2.
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Slowly depress accelerator pedal completely.
Percent indication in display field 1 must rise uniformly. In the process, the tolerance range of 3 to 93% is not completely utilized.
Percent indication in display field 2 must decrease uniformly. The tolerance range 97 to 3 % is not used completely during this.
NOTE:
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The reason why the value indicated in display field 1 climbs, while the value indicated in display field 2 decreases, has to do with the fact that the
potentiometers (angle sensors) in the throttle valve control unit run in opposite directions.
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This means that the voltage of angle sensor 1 runs from 0 to 5 volts. (The more the throttle valve is opened, the larger the voltage; percent
indication climbs).
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The voltage of angle sensor 2 runs from 5 to 0 volts. (The more the throttle valve is opened, the lower the voltage; the percentage decreases).
If indications do not resemble description:
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Check voltage supply and wire connections of throttle valve control module. Pay particular attention to harness connectors that could be loose or
corroded.
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Check accelerator pedal position sensor. See: Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Throttle Position (TP) Sensor and Sender - Accelerator Position
Check voltage supply throttle valve control module
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Pull connector (2) off throttle valve control module.
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Switch ignition on.