Engine Controls - Theory & Operation

• Introduction
• Computerized Engine Controls
  • Engine Coolant Temperature Sensor
  • Throttle Position Sensor
  • Knock Sensor
  • G Sensor
  • Intake Air Temperature Sensor
  • Idle Air Control Valve
  • Manifold Absolute Pressure Sensor
  • Powertrain Control Module/Engine Control Module
  • Fuel Cutoff Switch
• Emission System
  • Catalyst Monitor Oxygen Sensors
  • Evaporative Emission Control System Operation
  • Evaporative Emission Canister
  • Positive Crankcase Ventilation System Operation
• Fuel System
  • Exhaust Gas RECIRCULATION Valve
    • Notes
    • Results of Incorrect Operation
  • Fuel Control System Operation
    • Notes
    • 02S Sensors
    • Starting Mode
    • Clear Flood Mode
    • Run Mode
    • Open Loop
    • Closed Loop
    • Acceleration Mode
    • Deceleration Mode
    • Battery Voltage Correction Mode
    • Fuel Cut-Off Mode
  • Fuel Injector
  • Idle Air System Operation
• Ignition System Operation
  • Notes
  • Electronic Ignition System Ignition Coil
  • Crankshaft Position Sensor
  • Camshaft Position Sensor
• Self-Diagnostic System
  • Strategy-Based Diagnostics
  • No Trouble Found
  • Verifying Vehicle Repair
  • OBD II Serviceability Issues
    • Notes
    • Fuel Quality
    • Non-OEM Parts
    • Environment
    • Refueling
    • Vehicle Marshaling
    • Poor Vehicle Maintenance
    • Severe Vibration
    • Related System Faults
  • Serial Data Communications
    • Class II Serial Data Communications
  • On-Board Diagnostic (OBD II)
    • On-Board Diagnostic Tests
  • Comprehensive Component Monitor Diagnostic Operation
    • Notes
    • Input Components
    • Output Components
    • Passive & Active Diagnostic Tests
    • Intrusive Diagnostic Tests
    • Warm-Up Cycle
    • Freeze Frame
    • Failure Records
  • Common OBD II Terms
    • Diagnostic
    • Enable Criteria
    • Trip
    • Diagnostic Information
    • Malfunction Indicator Lamp (MIL)
    • Extinguishing MIL
    • Data Link Connector (DLC)
  • DTC Types
    • Notes
    • Type A
    • Type B
    • Type D
  • Reading Diagnostic Trouble Codes
    • Notes
    • DTC Modes
    • DTC Information Mode
    • DTC Status
    • Fail This Ign. (Fail This Ignition)
    • History
    • Last Test Fail
    • MIL Request
    • Not Run SCC (Not Run Since Code Clear)
    • Test Fail SCC (Test Failed Since Code Clear)
    • Specific DTC Mode
    • Failed Last Test
    • Failed Since Clear
    • Failed This Ig. (Failed This Ignition)
    • History DTC
    • MIL Requested
    • Not Run Since Cl (Not Run Since Cleared)
    • Not Run This Ig. (Not Run This Ignition)
    • Test Ran and Passed
  • Primary System-Based Diagnostics
    • Notes
    • Oxygen Sensor Diagnosis
    • Misfire Monitor Diagnostic Operation
    • Misfire Counters
    • Fuel Trim System Monitor Diagnostic Operation
    • Fuel Trim Cell Diagnostic Weights