Output Signals: Notes

Vehicles are equipped with different combinations of engine control components. Not all components are used on all models. To determine control (output) usage on specific models, see WIRING DIAGRAMS article. The available output signals from ECU include the following. For theory and operation of specific output components, refer to system indicated.

• A/C Clutch Control. See MISCELLANEOUS CONTROLS.
• Airflow Meter Self-Cleaning. Mass Airflow Meter. See INPUT DEVICES.
• Air Regulator. See IDLE SPEED under FUEL SYSTEM.
• Auxiliary Air Control Valve. See IDLE SPEED under FUEL SYSTEM.
• CHECK ENGINE Light. See SELF DIAGNOSTIC SYSTEM.
• ECCS Relay. See COMPUTERIZED ENGINE CONTROLS.
• EGR Control Solenoid. See EXHAUST GAS RECIRCULATION under EMISSION SYSTEMS.
• Fuel Injectors. See FUEL CONTROL under FUEL SYSTEM.
• Fuel Pressure Regulator Solenoid. See FUEL DELIVERY under FUEL SYSTEM.
• Fuel Pump Relay. See FUEL DELIVERY under FUEL SYSTEM.
• Oxygen Sensor Heating Element (Exhaust Gas Sensor). See INPUT DEVICES.
• Power Transistor(s) & Ignition Coil(s). See IGNITION SYSTEM.
• Self-Diagnostic System. See SELF DIAGNOSTIC SYSTEM.