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.
Circuit/System Description
The intake air heater is located at the intake manifold outlet and is used to heat the air before it enters the inner cooler during cold engine operation. The engine control module (ECM) determines when to request the glow plug control module to turn ON and OFF the intake air heater. The glow plug control module controls the intake air heater current by monitoring the feedback circuits of the intake air heater. The intake air heater will only be commanded ON while the engine is running if required by the ECM.
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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.