A4 Quattro Sedan V6-2.8L (ACK) (1997)
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Closed Throttle Position Switch: Testing and Inspection
CHECKING PROCEDURE:
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.
Specified Value: 0 ohms (continuity).
-
Open throttle slightly.
Specified Value: infinite 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.
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.
NOTE: 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.
ADJUSTMENT PROCEDURE:
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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.
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Perform Electrical Check of CTP switch again.
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Re-install throttle body and adjust accelerator pedal cable.
CHECKING WIRING BETWEEN CTP SWITCH AND ECM:
