CTS-V V8-6.0L VIN U (2006)
Throttle Body: Description and Operation
THROTTLE BODY ASSEMBLY
The throttle assembly contains the following components:
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The throttle blade
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The throttle actuator motor
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The throttle position (TP) sensor 1 and 2
The throttle body functions similar to a conventional throttle body with the following exceptions:
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An electric motor opens and closes the throttle valve.
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The throttle blade is spring loaded in both directions and the default position is slightly open.
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There are 2 individual TP sensors within the throttle body assembly.
The TP sensors are used to determine the throttle plate angle. The TP sensors provide the engine control module (ECM) with a signal voltage
proportional to throttle plate movement. The TP sensor 1 signal voltage at closed throttle is above 4 volts and decreases as the throttle plate is opened.
The TP sensor 2 signal voltage at closed throttle is below 1 volt and increases as the throttle plate is opened.
