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.
ECC CEC System: Description
The Electronic Concentrated Engine Control System (ECCS) is a computerized emission, ignition, and fuel control system. A single Electronic Control Unit (ECU) accepts input voltage signals from a variety of input components. The ECU compares each of the voltage input signals to a preset parameter which is preprogrammed into the ECU. It instantly analyzes each of the input voltage values and adjusts output voltage signals accordingly. This allows the vehicle to perform at its optimum under a wide variety of operating conditions. All vehicles are equipped with different combinations of sensors and engine control components. See Figure . The sensors inputting information to the ECU include the following:
- Air Temperature Sensor
- Crankshaft Angle Sensor
- Cylinder Head Temperature Sensor
- Detonation Sensor (Turbo Models)
- Exhaust Gas Oxygen Sensor
- Exhaust Gas Temperature Sensor (California Models)
- Fuel Temperature Sensor
- Mass Airflow Meter
- Park/Neutral Switch
- Power Steering Oil Pressure Switch
- Throttle Position Switch
- Vacuum Control Valve
- Vehicle Speed Sensor
The ECU processes information from these input sensors and sends appropriate voltage control signals to the following engine controls:
- Airflow Meter Self-Cleaning
- Air Induction Control Valve
- Air Regulator Control
- Auxiliary Air Control Valve
- Canister Purge Valve
- Denotation Sensor
- EGR Control Solenoid Valve
- Exhaust Gas Sensor Heater Control
- Fail-Safe System
- Fuel Injectors
- Fuel Pressure Regulator
- Fuel Pump Control
- Idle Air Adjusting Unit
- Idle Speed Control Valve
- Idle-Up Solenoid
- Mixture Heater
- Mixture Ratio Feedback Control
- Power Transistor(s) & Ignition Coil(s)
- Pressure Regulator Control Solenoid Valve
- Self-Diagnostics
- Spark Plug Switching Control
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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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