Tahoe 2WD V8-5.3L (2007)
Electronic Throttle Actuator: Description and Operation
THROTTLE ACTUATOR CONTROL (TAC) SYSTEM DESCRIPTION
PURPOSE
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:
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Accelerator pedal position sensing
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Throttle positioning to meet driver and engine demands
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Throttle position sensing
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Internal diagnostics
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Cruise control functions
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Manage TAC electrical power consumption
The TAC system includes the following components:
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The accelerator pedal position (APP) sensors
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The throttle body assembly
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The engine control module (ECM)
ACCELERATOR PEDAL POSITION (APP) SENSOR
The accelerator pedal contains 2 individual APP sensors within the assembly. The Accelerator Pedal Position (APP) sensors 1 and 2 are potentiometer
type sensors each with 3 circuits:
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A 5-volt reference circuit
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A low reference circuit
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A signal circuit
The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a
low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at
rest position is less than 1 volt and increases to above 4 volts as the pedal is actuated. The APP sensor 2 signal voltage at rest position is near 0.5 volt
and increases to more than 2 volts as the pedal is actuated.
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.
ENGINE CONTROL MODULE
The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the drivers intent and then
calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor.
MODES OF OPERATION
Normal Mode
During the operation of the throttle actuator control (TAC) system, several modes or functions are considered normal. The following modes may be
entered during normal operation:
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Minimum pedal value-At key-up the engine control module (ECM) updates the learned minimum pedal value.
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Minimum throttle position (TP) values-At key-up the ECM updates the learned minimum TP value. In order to learn the minimum TP value,
the throttle blade is moved to the closed position.
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Ice break mode-If the throttle is not able to reach a predetermined minimum throttle position, the ice break mode is entered. During the ice
break mode, the ECM commands the maximum pulse width several times to the throttle actuator motor in the closing direction.
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Battery saver mode-After a predetermined time without engine RPM, the ECM commands the battery saver mode. During the battery saver
mode, the TAC module removes the voltage from the motor control circuits, which removes the current draw used to maintain the idle position
and allows the throttle to return to the spring loaded default position.
Reduced Engine Power Mode
