A4 Sedan V6-2.8L (AFC) (1996)
Throttle Full Close Switch: Testing and Inspection
NOTE:
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To functionally check the Closed Throttle Position (CTP) switch, See Read measuring value block, display group 002, display field 4.
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The Closed Throttle Position (CTP) switch is located in the Throttle Position (TP) sensor assembly.
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Component locations, refer to "Component Overview - II", See: Powertrain Management/Fuel Delivery and Air Induction/Locations
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If, while checking or adjusting the Closed Throttle Position (CTP) switch, the noise deadener is removed; make sure during re-assembly that there
is a tight fit to the throttle body to avoid the possibility of an intake air leak.
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For safety, make sure that the Mass Air Flow (MAF) sensor output voltage is correct, refer to "Basic Setting (Function 04)". See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Basic Setting
(Function 04)
Requirements
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Accelerator pedal cable adjustment OK.
Electrical check
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Remove intake air sound absorber.
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Disconnect harness connector at throttle body.
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Switch multimeter (Fluke 83 or equivalent) to measure resistance (ohms) and connect between terminals 4 and 6 using jumper wires from
connector test kit VW 1594.
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Specified value: 0 ohms (continuity)
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Open throttle slightly.
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Specified value: infinity ohms (no continuity)
If the specified value is not obtained by opening the throttle slightly, or if the specified value is obtained only by moving the throttle:
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Adjust CTP switch. See Adjusting.
If, after adjusting the CTP switch, it is still not possible to obtain the specified function:
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Replace throttle position sensor assembly.
Adjusting
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Remove throttle body.
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Loosen two throttle position sensor mounting screws.
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Turn throttle position sensor in direction shown (arrows), without moving throttle valve shaft, until stop can be felt.
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Tighten throttle position sensor in this position.