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.
Computerized Engine Controls: Notes
On all models except 9000 Series Turbo, the computerized engine control system consists of 2 or 3 Electronic Control Modules (ECMs): a fuel injection ECM, an ignition ECM, and an Automatic Performance Control (APC) ECM. On 9000 Series Turbo, the computerized engine control system consists of an ECM, ignition cartridge, Manifold Absolute Pressure (MAP) sensor, fuel injectors, Hall Effect sensor and Intake Air Temperature (IAT) sensor. Automatic Performance Control (APC) is built into 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.