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.
System Description: Description
ECM constantly monitors engine speed to protect the catalyst from excessive heat load resulting from an misfire.
ECM performs smooth running control according to the following sensors and signals.
- Pressure sensor downstream of throttle valve (Engine load)
- Intake Camshaft Position Sensor (Intake camshaft position)
- Exhaust Camshaft Position Sensor (Exhaust camshaft position)
- Engine coolant temperature sensor
- Accelerator Pedal Position Sensor (Accelerator pedal position)
- Crankshaft position sensor (Engine speeds)
- ABS actuator and electric unit (control unit) (Each wheel speed signal)
The smooth running control has functions as follows.
- Misfire detecting function
- Misfire counting function
- Factors of smooth running control
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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