Engine Controls - System/Component Tests

• Introduction
• Computerized Engine Controls
  • Notes
  • Control Unit
    • Notes
    • Ground Circuits (SC300)
• Engine Sensors & Switches
  • Airflow Meter
    • Airflow Meter Air Temperature Sensor Resistance
    • Airflow Meter Measuring Plate Resistance (ES300)
  • O2 Sensor
  • Clutch Start Switch
    • Es300
  • Neutral Start Switch
  • Throttle Position Sensor (TPS)
• Relays
  • Circuit Opening Relay
    • Es300
  • EFI Main Relay
  • Starter Relay
• Fuel System
  • Fuel Delivery
  • Fuel Control
    • Fuel Cut System
    • Fuel Injectors
    • Cold Start System
• Idle Control System
  • Idle Air Control (IAC) Valve
• Ignition System
  • Notes
  • Ignition Coils
• Emission Systems & Sub-Systems
  • Exhaust Gas RECIRCULATION (EGR)
    • EGR System (ES300, GS300 & LS400)
    • EGR System (SC300 & SC400)
    • EGR Vacuum Modulator Check (ES300, GS300 & LS400)
    • Thermal Vacuum Valve (TVV) (ES300)
    • Vacuum Switching Valve (GS300, LS400, SC300 & SC400)
  • Fuel Evaporation
    • EVAP Canister
    • Thermal Vacuum Valve (TVV) (ES300)
    • Vacuum Switching Valve (GS300, LS400, SC300 & SC400)
  • Positive Crankcase Ventilation (PCV)
    • PCV Valve
  • Throttle Controls
    • Dashpot (ES300, LS400 & SC400)
    • Dashpot (GS300 & SC300)
• Miscellaneous Controls
  • Notes
  • Cooling Fan
    • Electronic Cooling Fan System (GS300 & LS400)
    • A/C Pressure Switch (LS400)
    • Cooling Fan ECM (ES300 & SC400)
    • Coolant Temperature Sensor (ES300, SC300 & SC400)
    • Coolant Temperature Switch (GS300 & LS400)
    • Cooling Fan Relay (GS300)
    • Cooling Fan Main Relay (GS300), Engine Main Relay (LS400), & Cooling Fan Relay No. 3 (LS400)
    • Cooling Fan Relay No. 1 & 2 (LS400)
    • Cooling Fan Motor (GS300 & LS400)
  • Transmission