Theory and Operation: Theory/Operation

• Introduction
• Computerized Engine Controls
  • Control Unit
  • Input Devices
    • Notes
    • A/C Compressor Cut-In Signal Sensor
    • Airflow Sensor Position Indicator
    • Automatic Transmission Shift Lever Position Sensor
    • Air Temperature Sensor
    • Coolant Temperature Sensor
    • Altitude Correction
    • EGR Temperature Sensor (420 & 560 California Only)
    • Flywheel or Flexplate Sensors (3)
    • Maximum Engine Speed Sensor
    • Oxygen Sensor
    • TD Signal
    • Throttle Valve Switch
    • Relays vehicle speed to ECU.
  • Output Signals
• Fuel System
  • Fuel Delivery
    • Fuel Pump
    • Fuel Pump Relay
    • Differential Fuel Pressure Regulator
  • Fuel Control
    • Fuel Distributor Unit (U)
    • Cold Start
    • Cranking Enrichment
    • Warm-Up Enrichment
    • Altitude Correction
  • Idle Speed
    • Idle Speed Control Unit
    • Idle Speed Air Valve (190E 2.6L, 260E & 300)
    • Idle Speed Air Valve (420 & 560 Series)
• Lambda Control
• Ignition System
  • EZL Ignition
• IGN Timing Control
  • Ignition Timing Control
• Emission Systems
  • Air Injection
  • Deceleration Control
  • EGR
  • Evaporative Emissions
• Self-Diagnostic System
  • Fault Codes
  • Check Engine Light