Intermittent failures cause MIL to flicker or glow and go out about 10 seconds after the intermittent fault goes away. The corresponding diagnostic trouble code, however, will be retained in PCM memory. On models using digital display on dash to indicate codes, codes may be accompanied by a "current" or "history" indication for intermittent and hard codes. If related fault does not reoccur within 50 engine restarts, related diagnostic trouble code will be erased from PCM memory. Intermittent failures may be caused by sensor, connector or wiring related problems. See appropriate TESTS W/O CODES article.
Home/Buick/Riviera/Buick Riviera VIII (1994-1999)/Repair manual/Theory & Operation/"Intermittent Failures"
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