Throttle Body Assembly

The throttle body assembly contains the following components:

• The throttle blade
• The throttle actuator motor
• The throttle position (TP) sensor 1 and 2

The throttle body functions are similar to a conventional throttle body with the following exceptions:

• An electric motor opens and closes the throttle valve.
• The throttle blade is spring loaded in both directions and the default position is slightly open.
• There are 2 individual TP sensors within the throttle body assembly.

TP sensors are sensors 1 and 2 are potentiometer type sensors, they 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 near the 5-volt reference voltage and decreases as the throttle plate is opened. The TP sensor 2 signal voltage at closed throttle is near the low reference voltage and increases as the throttle plate is opened. Each TP sensor has a signal circuit and they both share a 5-volt reference and a low reference circuits.