Engine Controls - Theory & Operation

• Introduction
• Computerized Engine Controls
  • Control Unit Operation
• Input Devices
  • Notes
  • A/C Compressor Cut-In Signal Sensor
  • Airflow Sensor Position Indicator
  • Air Temperature Sensor
  • Altitude Correction
  • Automatic Transmission (A/T) Shift Lever Position Sensor
  • Coolant Temperature Sensor
  • Crankshaft Position Indicator
  • EGR Temperature Sensor (420 & 560 CALIFORNIA Only)
  • Maximum Engine Speed Sensor
  • Oxygen (O2) Sensor
  • TD Signal
  • Throttle Valve Switch
  • Vehicle Speed Signal (Speedometer)
• Output Signals
  • Notes
  • Air Injection Relay
  • Fuel Distributor Unit (U)
  • Differential Fuel Pressure Regulator
  • EZL Ignition
  • Idle Speed Air Valve
  • Idle Speed Control Unit
  • Check Engine Light
• Fuel System
  • 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, 260E & 300)
  • Idle Speed Air Valve (420 & 560 Series)
• Lambda Control Operation
• EZL Ignition Operation
• Ignition Timing Control
• Air Injection
  • Air Injection Relay
• Deceleration Control
• Exhaust Gas RECIRCULATION (EGR)
  • 460 & 560 Series Only
• Evaporative Emissions
• Self-Diagnostic System
  • Fault Codes
  • Check Engine Light