Theory and Operation: Theory/Operation

• Introduction
• Computerized Engine Controls
  • Notes
  • Electronic Control Module (ECM)
    • Metro
    • Prizm
    • Spectrum
    • Tracker
  • Input Devices
    • Notes
    • Air Conditioner Signal
    • Air Temperature Sensor (Tracker)
    • Coolant Temperature Sensor (Metro, Prizm & Tracker)
    • Coolant Temperature Switch (Spectrum)
    • Crank Angle Sensor (Metro & Prizm)
    • EGR Temperature Sensor (California Tracker)
    • Electrical Load (Tracker)
    • Engine Speed (RPM) Signals
    • Engine Start Signals
    • Gear Position (5th Gear Switch M/T Tracker)
    • High Altitude Compensation Switch (Spectrum)
    • Idle Switch
    • Intake Air Temperature Switch (Spectrum)
    • Lock-Up Solenoid Feedback (Tracker A/T)
    • Manifold Absolute Pressure (MAP) Sensor (Metro, Prizm & Tracker)
    • Manifold Air Temperature Sensor (Metro & Prizm)
    • Oxygen (O2) Sensor
    • Park/Neutral Switch (A/T)
    • Throttle Position Sensor (Except Metro M/T)
    • Throttle Switch (Metro M/T & Prizm)
    • Transmission Converter Clutch (TCC Tracker)
    • Vehicle Speed Sensor (Metro & Prizm)
  • Output Signals
• Fuel System
  • Fuel Delivery - CARBURETED (Spectrum)
    • Fuel Pump
  • Fuel Delivery - Fuel Injection (Metro, PRIZM & Tracker)
    • Fuel Pump
    • Circuit Opening Relay (Prizm)
    • Control Relay (Tracker)
    • Fuel Pump Relay (Metro)
    • Fuel Pressure Regulator
    • Main Relay (Prizm)
  • Fuel Control - CARBURETED (Spectrum)
    • Cold Start Choke System
    • Deceleration Mixture Control System
    • Fuel-Cut System
    • High Altitude Compensation
    • Secondary Throttle System
    • Mixture Control Solenoid
  • Fuel Control - Fuel Injection (Metro, PRIZM & Tracker)
    • Fuel Injector(s)
    • Battery Voltage Compensation
    • Fuel-Cut System
  • Idle Speed - CARBURETED (Spectrum)
    • Base Idle Speed
    • Cold Start Fast Idle System
  • Idle Speed - Fuel Injection
    • Air Valve
    • Idle Speed Control (ISC) Solenoid
    • Throttle Opener Control System (Tracker)
    • Vacuum Switching Valve (Prizm)
• Ignition System
  • Electronic Ignition System
    • Metro, Spectrum & Tracker
    • Prizm & Metro (ESA)
  • Ignition Timing Control System
    • Advance Control (Metro ESA & Prizm)
    • Advance Control (Tracker)
    • Advance Control (Metro w/o ESA & Spectrum)
• Emission Systems
  • Notes
  • Air Injection Reaction (Air) System
    • Spectrum
  • Early Fuel Evaporation
    • Early Fuel Evaporation (EFE) System (Spectrum)
    • Positive Temperature Coefficient (PTC) System (Tracker)
  • Exhaust Gas RECIRCULATION (EGR)
    • Notes
    • Metro & Prizm
    • Spectrum
    • Tracker (California)
    • Tracker (Federal)
    • Temperature Sensor (California Tracker)
    • Vacuum Modulator (Backpressure Transducer)
  • Fuel Evaporation System
    • Metro
    • Prizm
    • Spectrum
    • Tracker
  • Positive Crankcase Ventilation (PCV)
    • Metro & Tracker
    • Prizm
    • Spectrum
  • Thermostatic Air Cleaner
    • Carbureted (Spectrum)
• Miscellaneous Controls
  • Transmission Control
    • Lock-Up Solenoid Feedback (Tracker A/T)
    • Lock-Up Solenoid Relay (Tracker A/T)
• Self-Diagnostic System
  • "Check Engine" Light
    • Notes
    • Tracker (Except California Models)
  • Self-Diagnosis
    • Metro
    • Prizm
    • Spectrum
    • Tracker