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 System Description
The electronic control system consists of various sensors, switches, ECUs which detect the state of engine and driving conditions, ECM which controls various electric control devices according to the signals from various sensors and various electric control devices.
Functionally, it is divided into the following subsystems:
- Fuel injection control system
- Ignition control system
- Electric throttle control system
- Fuel pump control system
- Radiator cooling fan control system
- Evaporative emission control system
- A/F sensor heater control system
- HO2S heater control system
- A/C control system
- Immobilizer control system
- Controller (computer) communication system
Especially, ECM, BCM, combination meter, ABS/ESP® control module, TCM (CVT model), 4WD control module (4WD model), steering angle sensor (ESP® model), keyless start control module (keyless start model), HVAC control module (Auto A/C), SDM (Advanced air bag model) and ID controller (Canada model) intercommunicate by means of CAN communication.
Refer to ENGINE AND EMISSION CONTROL SYSTEM FLOW DIAGRAM and ENGINE CONTROL SYSTEM CIRCUIT DIAGRAM .
NO RELATED
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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.