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.
Air Induction
Air is drawn through the air cleaner and forced through the throttle body by the turbocharger. Maximum turbocharger boost of 7.25 psi (.5 kg/cm2 ) is controlled by a calibrated wastegate. The amount of air entering the engine is controlled by a cable operated throttle valve in the throttle body.
The throttle body houses the throttle position sensor (TPS) and automatic idle speed (AIS) motor. The TPS is an electrical resistor which is connected to the throttle valve. The TPS transmits a ignal to the logic module in relationship to throttle valve angle. From this signal, the module calculates fuel injector "ON" time to provide adequate air/fuel mixture.
The AIS motor controls the flow of air through the throttle body during engine idle. The motor opens and closes an air by-pass on the back of the throttle body to increase or decrease idle speed as engine load varies. The logic module monitors the AIS motor and issues change command to the injectors to increase or decrease the amount of fuel injected.
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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.