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.
Electronic Control Unit (Ecu): Notes
An 88-pin ECU is used. See Figure. ECU uses the following input signals to determine optimum fuel injection and ignition timing: intake airflow, intake air temperature, throttle position, coolant temperature, engine speed, vehicle speed, crankshaft position, knock sensors and exhaust gas oxygen content.
ECU can operate engine in a limp mode, allowing vehicle operation despite component failure. ECU also has adaptive capabilities to compensate for component wear and other factors, such as minor vacuum leaks. Once a fault is recognized, it is stored in ECU memory as a Diagnostic Trouble Code (DTC). The system automatically substitutes a fixed replacement value for the incorrect value caused by a defective component or circuit.
An air/fuel ratio of 14.7:1 is maintained under most driving conditions. Maximum engine RPM is limited by ECU by eliminating power to fuel injectors. The ECU assumes control of following functions.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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