C 1500 Yukon XL 2WD V8-5.3L VIN T (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-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 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 throttle to below 1.0 volt at 100 percent throttle.
