The digital EGR valve is designed to accurately supply EGR to engine, independent of intake manifold vacuum. The valve controls EGR flow from exhaust to intake manifold through 3 internally-mounted solenoids. When each solenoid is energized, a pintle is lifted to allow exhaust gas to flow through valve. Solenoids are energized individually, in pairs or together to provide 7 different EGR flow ratios. This enables PCM to tailor EGR flow to specific engine requirements.
Home/Buick/Riviera/Buick Riviera VIII (1994-1999)/Repair manual/Theory & Operation/Digital EGR System
Contents
Wiring diagrams Section: Theory & Operation- Introduction
- Terminology
- Mass Airflow (MAF)
- Speed Density
- Computerized Engine Controls
- Powertrain Control Module (PCM)
- Arithmetic Logic Unit (Alu)
- Central Processing Unit (Cpu)
- Power Supply
- Memories
- Input Devices
- A/c Request Signal
- A/c Pressure Sensor
- A/c Pressure Switches
- A/c Temperature Sensors
- Battery Voltage
- Brake Switch Feedback
- Camshaft Position Sensor
- Crankshaft Position (Ckp) Sensor
- Engine Coolant Temperature (ECT) Sensor
- Fuel Pump Feedback
- Gear Switches
- Ignition/crank Signal
- Intake Air Temperature (IAT) Sensor
- Knock Sensor
- Manifold Absolute Pressure (MAP) Sensor
- Mass Airflow (MAF) Sensor
- Oxygen Sensor (O2S)
- Park/neutral Position (Pnp) Switch
- Power Steering Pressure (Psp) Switch
- RPM Reference Signal
- Throttle Position (Tp) Sensor
- Throttle Position Switch
- Transmission Range Switch
- Vehicle Speed Sensor (Vss)
- Output Signals
- A/c Compressor Clutch
- Canister Purge Control Solenoid
- Cooling Fan Relay
- Digital EGR Valve
- Direct Ignition System (Dis)
- EGR Control Solenoid
- Electronic Variable Orifice (Evo) Actuator
- Fuel Injectors
- Fuel Pump & Fuel Pump Relay
- High Energy Ignition Electronic Spark Timing (Hei-Est)
- Hot Light or Coolant Temperature (Temp) Light
- Idle Air Control (Iac) Valve
- Linear EGR Valve
- Knock Sensor Operation
- Malfunction Indicator Light (MIL)
- Self-Diagnostics
- Serial Data
- Shift Solenoids (Electronically-Controlled Auto Transmission)
- Torque Converter Clutch
- Fuel Pump
- Fuel Pump Relay
- Fuel Pressure Regulator
- Fuel Control
- Open Loop
- Closed Loop
- Battery Voltage Correction
- Fuel Cut-Off
- Multiport Fuel Injection (Mfi)
- Sequential Fuel Injection (Sfi)
- Idle Speed
- Idle Air Control Valve
- Ignition System
- Ignition Timing Advance
- Emission Systems
- Air Injection System
- Air Pump (Electric)
- Check Valve
- Electric Air Pump Relay
- Exhaust Gas Recirculation (EGR)
- Digital EGR System
- Linear EGR System
- Negative Backpressure EGR Valve
- Evaporative Emission Control
- Evaporative Emission System Uses 4 Basic Components
- Carbon Canister
- Canister Purge Control Valve
- Tank Pressure Control Valve
- Positive Crankcase Ventilation (PCV)
- Self-Diagnostic System
- "Hard Failures"
- "Intermittent Failures"
- Miscellaneous Controls
- Electric Cooling Fan
- Electronic Variable Orifice (Evo) Actuator (Saturn)
- Hot Light or Coolant Temperature Light
- Torque Converter Clutch (Non-Electronic Transmission)
- Torque Converter Clutch (Electronic Transmission)
- Electronic Transmission
- A/c Compressor
- Abbreviations
- Accessory Drive Belts
- Adjustments
- Airbag
- Anti-Lock/traction Control
- Application
- Automatic HVAC System
- Automatic Trans
- Axle Shafts
- Basic Trouble Shooting
- Brakes
- Charging System
- Check Lists
- Communication Devices
- Computer Relearn
- Cooling Fan
- Cooling System (Mechanical)
- Cruise Control Systems
- Diagnostic Connector Locations
- Door Locks & Anti-Theft Systems
- Drive Cycles
- Driveline/axles
- DTC Index
- Electrical
- Electrical Component Locations
- Electronic Steering
- Electronic Suspension
- Emission Applications
- Engine
- Engine Performance
- Fuses & Circuit Breakers
- Gauges & Instrument Panels
- General Servicing - All Makes
- Headlights
- Heated Glass/defoggers
- Identification
- Manual & Power Steering
- MAP Guidelines
- Mechanical
- Mechanical - Hydraulic
- Metric Conversions
- Mirrors
- Mode 6
- Passive Restraints
- Procedures
- Removal & Installation
- Reset Procedures
- Restraints
- Rpo Codes
- Seats
- Sensor Range Charts
- Specifications
- Starter
- Steering
- Steering Column
- Steering Column Switches
- Sun Roof/t-Top/convertible Top
- Suspension Front
- Suspension Rear
- Testing & Diagnostics
- Theory & Operation
- Traction Control Disable
- Transmission
- Wheel Alignment
- Windows
- Wiper/washer Systems
- Wiring Diagrams - Engine Performance