Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Intake Throttle
The intake throttle modulates the intake airflow from the charge air cooler (CAC) into the intake manifold system. The intake throttle uses an electric motor to open and close a throttle plate, based upon inputs from the PCM. The intake throttle actuator is controlled by a pulse width modulated (PWM) signal to attain the desired position using the TACM+ and TACM- circuits. The throttle position ranges between 0%, or fully open, and 100%, or fully closed.
The PCM senses the intake throttle plate position by monitoring the TP circuit. If the PCM detects an intake throttle plate position concern, a DTC sets indicating the throttle plate is either not at the desired position or the TP circuit is out of range.
Typical Intake Throttle
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.