Passat Sedan L4-1781cc 1.8L Turbo (AEB) (1999)
Display will appear as shown
Rapid data transfer
HELP
Select function XX
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Press 0 and 8 buttons to select Function 08: "Read measuring value block"
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Press Q button to enter input
Display will appear as shown
Read measuring value block
HELP
Input Display group number XXX
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Press 0, 0 and 3 buttons to select "Display group 3"
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Press Q button to enter input
Display will appear as shown (1 to 4 = Display zones)
Read measuring value block 3
->
1
2
3
4
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Read off throttle valve angle in Display zone 3.
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Slowly but fully open throttle, observe angle in Display zone 3
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Value must increase uniformly over the complete range.
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Press the -> button.
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Press 0 and 6 buttons to select Function 06: "End data output"
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Press Q button to enter input
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Switch OFF ignition.
NOTE: The displayed value is dependent on the tolerances of the Throttle Position sensor and does not correspond to the actual opening angle.
If the value does not increase uniformly:
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Replace Throttle Body Control Module J338.
If the display constantly shows 0 degree angle or is above 90 degree angle;
Display
Cause
0 degree angle
Open circuit or short to positive
above 90 degree angle
Short to Ground
Continuation of check when display 0 degree angle:
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Disconnect 8-pin harness connector to Throttle Body Control Module.