Engine Controls - Theory & Operation - 4.3L.

• Introduction
  • Notes
  • Terminology
• Air Induction System
  • Intake Manifold Tuning Valve Assembly (CPI)
  • Airflow Sensing
    • Speed Density
• Computerized Engine Controls
  • Notes
  • Powertrain Control Module
    • Notes
    • Arithmetic Logic Unit (ALU)
    • Central Processing Unit (CPU)
    • Power Supply
    • Memories
  • Input Devices
    • Notes
    • A/C On (A/C Request) Signal
    • Battery Voltage
    • Brake Switch Feedback
    • Coolant Temperature Sensor (CTS)
    • Cranking Signal
    • Digital Ratio Adapter Controller (DRAC)
    • EGR Pintle Position
    • Fuel Pump Feedback
    • Gear Switches
    • Knock Sensor (KS)
    • Manifold Absolute Pressure (MAP) Sensor
    • Intake Air Temperature (IAT) Sensor (Some Engines)
    • Oxygen Sensor (O2S)
    • Park/Neutral Position (PNP) Switch
    • Pressure Switch Manifold (PSM) (4L60-E & 4L80-E Transmission)
    • RPM Reference Signal
    • Throttle Position (TP) Sensor
    • Transmission Temperature Sensor (TTS) (4L60-E, 4L80-E
    • Vehicle Speed Sensor (VSS)
  • Output Signals
    • Notes
    • ABS Control Motors ("S" & "T" Series With VCM)
    • A/C Clutch Relay
    • Air Injection Control Solenoid
    • Cruise Control Solenoids
    • SERVICE ENGINE SOON Light
    • EGR Control Solenoid Valve
    • Electronic Ignition (EI)
    • ESC Timing Retard
    • EVRV Solenoid
    • Fuel Injectors
    • Fuel Module
    • Fuel Pump & Fuel Pump Relay
    • HEI-EST Ignition
    • Idle Air Control (IAC) Valve
    • Self-Diagnostics
    • Serial Data
    • Shift Solenoids (4L60-E, 4L80-E & 4T60-E Transmission)
    • Torque Converter Clutch
    • Transmission Shift Light (Manual Transmission)
• Fuel System
  • Fuel Delivery
    • Fuel Pump
    • Fuel Pressure Regulator (CPI)
    • Fuel Pressure Regulator (TBI)
    • Fuel Pump Relay
  • Fuel Control
    • Notes
    • Open Loop
    • Closed Loop
    • Central Port Injection (CPI)
    • Throttle Body Injection (TBI)
    • Fuel System Operating Modes
  • Idle Speed
    • Notes
    • Idle Air Control (IAC) Valve
• Ignition System
  • Notes
  • High Energy Ignition Electronic Spark Timing (HEI-Est) Distributor
• Ignition Timing Control Systems
  • Ignition Timing Advance
    • Notes
    • ESC Detonation Retard Operation
• Emission Systems
  • Catalytic Converter
  • Exhaust Gas RECIRCULATION (EGR)
    • Notes
    • Port EGR
    • Linear EGR
    • Negative Backpressure EGR
  • Evaporative Emission Control
    • Notes
    • Carbon Canister
    • Canister Control Valve (CCV) (Some Federal)
    • Purge Control Solenoid
  • Positive Crankcase Ventilation (PCV)
  • Air Cleaner (ACL)
    • Notes
    • Wax Pellet Controlled
• Self-Diagnostic System
  • Notes
  • "Hard Failures"
  • "Intermittent Failures"
  • Service Engine/Throttle Soon Light
  • Serial Data
• Miscellaneous Pcm Controls
  • Notes
  • Abs
  • A/C Clutch
    • Notes
    • A/C Pressure Switches
  • Cruise Control
  • Transmission
    • Torque Converter Clutch
    • Electronic Transmission (4L60-E, 4L80-E & 4T60-E)
    • Shift Light
• Wiring Diagrams
  • Astro & Safari
  • "C" & "K" Series Pickup, Sierra - W/ A/T
  • "C" & "K" Series Pickup, Sierra - W/ M/T
  • "P" Series - W/ M/T
  • "P" Series - W/ 4L80-E
  • "S" & "T" Series - VIN W With Pcm
  • "S" & "T" Series - VIN W With VCM
  • "S" & "T" Series - VIN Z With Pcm
  • "S" & "T" Series - VIN Z With VCM
  • Van - With 4L60-E
  • Van - With 4L80-E