C 3500 Truck 2WD V8-8.1L VIN G (2001)
Throttle Body: Description and Operation
THROTTLE BODY ASSEMBLY
Throttle Body Assembly
The throttle body for the TAC system is similar to a conventional throttle body with a couple of exceptions. One exception being the use of a motor to
control the throttle position instead of a mechanical cable.
The other exception is the new design Throttle Position (TP) sensor. The TP sensor mounts on the side of the throttle body opposite the throttle actuator
motor. The TP sensor is actually 2 individual TP sensors within one housing. Separate signal, low reference, and 5.0-volt reference circuits are used to
connect the
TP sensors and the TAC module. The TP sensor 1 signal voltage increases as the throttle opens, from around 1.0 volt at 0 percent throttle to above 3.5
volts at 100 percent throttle. TP sensor 2 signal voltage decreases as the throttle is opened, from around 3.8 volts at 0 percent throttle to below 1.0 volt
at 100 percent throttle.
