Engine Controls - Theory & Operation

• Introduction
• Engine Control Unit (Ecu)
• Input Devices
  • Notes
  • A/C Controls
  • Air Temperature Sensor
  • Battery Voltage
  • Closed Throttle Switch
  • Coolant Temperature Sensor/Switch
  • Detonation (Or Knock) Sensor
  • Distributor (Pickup Coil & Trigger Wheel) 5.9L
  • Distributor (Sync Signal Generator) 4.0L & 4.2L
  • Manifold Absolute Pressure (Map) Sensor
  • Manifold Air Temperature (Mat) Sensor
  • Neutral Safety Switch
  • Oxygen Sensor
  • Power Steering Pressure Switch
  • Speed Sensor/Cps (Crankshaft Position Sensor)
  • Start Signal
  • TPS (Throttle Position Sensor)
  • Wide Open Throttle (Wot) Switch
• Output Signals
  • Notes
  • A/C Clutch Relay
  • B+ Latch Relay
  • EGR/Evaporative Canister Purge Solenoid
  • EGR Valve Vacuum Solenoid
  • Fuel Injector
  • Fuel Pump Control Relay
  • Idle Speed Actuator (ISA) Motor
  • Ignition Timing Control
  • Oxygen Sensor Heater Relay
  • Shift Indicator Lamp
  • Fuel Pressure Regulator
    • Notes
    • Fuel Pump
    • Fuel Pump Control Relay
    • Fuel Return
• Fuel Control System
  • B+ Latch Relay (CARBURETED Engines)
  • Fuel Injector (TBI)
  • Fuel Injector (MPI)
  • Oxygen Sensor Heater Relay
• Idle Speed Actuator (ISA) Motor
• Ignition Timing Control System
  • Ignition Timing Control (2.5L & 4.0L)
  • Ignition Timing Control (4.2L)
  • Ignition Timing Control (5.9L)
  • Detonation Retard Operation (4.0L)
• Emission Systems
• Air Injection System
  • Notes
  • Exhaust Gas RECIRCULATION (EGR) Control (5.9L Engines)
  • EGR/Coolant Temp Override (EGR/CTO) Control (4.2L Engines)
  • Evaporative Emissions System
  • Thermostatic Air Cleaner
• Self Diagnostics
  • On-Board Diagnostic Capability
• Miscellaneous Controls
• A/C Clutch Relay
• Cooling Fan
  • Cooling Fan Motor
  • Cooling Fan Control Relay
  • Torque Converter Clutch
  • Lock-Up Relay
  • Shift Indicator Light