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.
Engine Controls - Tests W/Codes: Introduction: Terminology
Due to Federal government requirements, manufacturers may use names and acronyms for systems and components different than those used in previous years. The following table will help eliminate confusion when dealing with these components and systems.
| Former Name Or Acronym | New Name Or Acronym |
|---|---|
| Airflow Sensor (AFS) | Mass Airflow (MAF) Sensor |
| Air Temperature Sensor | Intake Air Temperature (IAT) Sensor |
| CHECK ENGINE Light | Malfunction Indicator Light (MIL) |
| SERVICE ENGINE SOON Light | Malfunction Indicator Light (MIL) |
| Crank Angle Sensor | Camshaft Position (CMP) Sensor |
| Oxygen (O2) Sensor | Heated Oxygen Sensor (HO2S) |
| Pressure Sensor (PS) | Manifold Absolute Pressure (MAP) Sensor |
| Throttle Position Sensor (TPS) | Throttle Position (TP) Sensor |
| Trouble Codes | Diagnostic Trouble Codes DTC(s) |
| Water Temp. Sensor (WTS) | Engine Coolant Temp. (ECT) Sensor |
Use the Manual With the Right Hardware
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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.
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