The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and
eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position (APP) sensing
• Throttle positioning to meet driver and engine demands
• Throttle position (TP) sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system includes the following components:
• The APP sensors
• The throttle body assembly
• The powertrain control module (PCM)
eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position (APP) sensing
• Throttle positioning to meet driver and engine demands
• Throttle position (TP) sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system includes the following components:
• The APP sensors
• The throttle body assembly
• The powertrain control module (PCM)
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Electronic Throttle Control Description
Bob said:
2004 envoy, 4.2l, engine idle is running very fast , throttle body is spotless. idles at 2000rpm at 30kph.
2004 envoy, 4.2l, engine idle is running very fast , throttle body is spotless. idles at 2000rpm at 30kph.
Stan said:
Reply @Bob, If the throttle is spotless because you just cleaned it, and NOW it idles high, you would need to have the idle relearned. This is best done
with a scanner, but can be done by driving on expressway for a few miles, then letting idle in gear for a few minutes. If this is not the case, then look for
a vacuum leak. The intake manifold bolts tend to get loose.
Reply @Bob, If the throttle is spotless because you just cleaned it, and NOW it idles high, you would need to have the idle relearned. This is best done
with a scanner, but can be done by driving on expressway for a few miles, then letting idle in gear for a few minutes. If this is not the case, then look for
a vacuum leak. The intake manifold bolts tend to get loose.