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
Computerized engine control system consists of various input devices which detect vehicle operating conditions. On all models, the Electronic Control Module (ECM) monitors input signals received from input devices and sends output signals to regulate air/fuel mixture and other engine control operations. This lowers exhaust emissions, while maintaining fuel economy and driveability.
System incorporates a built-in fail-safe mechanism, self-diagnostic system and back-up function. Fail-safe mechanism substitutes preprogrammed sensor values to the ECM if a sensor fails, thus providing a certain level of engine performance. Self-diagnostic system provides capability of recognizing a system fault and storing a related trouble code in ECM memory for diagnostic purposes. Back-up function of ECM controls operation of fuel injectors on basis of signals from Pressure (MAP) sensor if ECM fails to operate properly.
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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