Engine Controls - System & Component Testing

• Introduction
• Model Identification
• Visual Inspection
• ECM Voltage & Ground Check
  • Notes
  • Voltage Check
    • Voltage Check To ECM Fuse
  • Ground Check
  • Checking Data Link Connector Wiring
    • Voltage Check To Black DLC
    • Checking Wiring Between White DLC & Motronic ECM
    • Checking White DLC Wiring
    • Wires Of Different Colors Connected To K & L Connectors
    • Several Wires Of Same Color Connected To K & L Connectors
• Connecting Scan Tool (VAG 1551)
• Connecting VAG 1598 Test Box
• Test Drive
• Component Locations
• Air Induction Systems
  • Turbocharger & WASTEGATE Checking
    • Testing Requirements
    • Road Test
  • By-Pass Valve
    • Notes
    • Checking Valve With Vacuum Pump
  • Charge Air Cooler (INTERCOOLER)
  • WASTEGATE By-Pass Regulator Valve
    • Notes
    • Checking Electrically
    • Checking Actuation
• Computerized Engine Controls
  • MOTRONIC Engine Control Module
    • Notes
    • Ground Circuits
    • Power Circuits
• Engine Sensors & Switches
  • Board Computer Control For Boost Pressure Display Checking
  • BRAKELIGHT Switch
  • Camshaft Position Sensor
  • Closed Throttle Position Switch
    • Notes
    • Checking Idle and/or ECM Partial Load Recognition Function
    • Checking Closed Throttle Position Switch
    • Checking ECM -To-Throttle Position Sensor Wiring.
  • Clutch Switch (M/T)
  • Crankshaft Position Sensor
  • Engine Coolant Temperature Sensor
    • Notes
    • Checking ECT Sensor Signal
  • Fuel Consumption Rate Signal Checking
  • Heated Oxygen Sensor
    • Notes
    • Checking Control Function
    • Checking HO2S Heating Circuit
    • Checking HO2S Control Signal
  • Intake Air Temperature Sensor
    • Notes
    • Intake Air Temperature Sensor Replacement
  • Knock Sensor
    • Notes
    • Knock Sensor 1 (Front G61)
    • Knock Sensor 2 (Rear G66)
  • Mass Airflow Sensor
    • Notes
    • Checking MAF Sensor Wiring
    • Checking MAF Sensor Function
    • Checking MAF Sensor Burn-Off
    • Test
  • Back-Up Light Switch (M/T)
  • Pressure Sensor
    • Notes
    • Test
    • Checking Voltage Supply-To-Pressure Sensor
    • Checking Wiring & Connections-To-Pressure Sensor
  • Tachometer Control Signal Checking
  • Throttle Angle Output Signal Checking
    • Notes
    • Testing
  • Throttle Position Sensor
    • Notes
    • Requirements
    • Checking Function
    • Checking Throttle Position Sensor Resistance
    • Checking Voltage Supply-To-Throttle Position Sensor
    • Checking Wiring & Connections-To-Throttle Position Sensor
  • Vehicle Speed Sensor Checking
    • Notes
    • Perform Test Drive
• Modules, Motors, Relays & Solenoids
  • Fuel Pump Relay
  • Fuel Pump Relay Control Signal
• Fuel Systems
  • Fuel System Pressure Release
  • Fuel Delivery
    • Notes
    • Fuel Pump Circuit
    • Fuel Pressure Regulator
  • Fuel Control
    • Notes
    • Fuel Injectors Actuation
    • Fuel Injectors Checking
    • Fuel Injector Leakage
    • Fuel Injector Resistance
    • Fuel Injector Volume
    • Deceleration Fuel Shut-Off Valve
• Idle Control Systems
  • Idle Air Control Valve
    • Notes
    • Idle Air Control Valve Resistance
    • Idle Air Control Valve Mechanical Check
    • Idle Air Control Valve Control Signal Check
  • Idle Speed
    • Notes
    • Requirements
    • Testing
  • Carbon Monoxide Content
    • Notes
    • Requirements
    • Testing
• Ignition Systems
  • Timing Control Systems
    • Notes
    • Camshaft Position Sensor Basic Adjustment
  • Spark Plug Connector Checking
  • Checking Control Of N122 & N127 Power Output Stages
  • Checking Voltage Supply For Ignition Coils N128, N158, N163 & N164
  • Engine Speed Sensor Checking
• Emission Systems & Sub-Systems
  • Fuel Evaporative System
    • Notes
    • Charcoal Canister
    • Fuel Vapor Rollover Valve
    • Pressure Holding Valve
    • Ventilation Valve
  • EVAP Canister Purge Regulator Checking
    • Notes
    • Checking Electrically
    • Checking Control Signal
  • Positive Crankcase Ventilation
    • PCV Valve
• Throttle Controls
  • Dashpot
• Miscellaneous Controls
  • Notes
  • A/C Compressor-On-Signal & A/C Compressor Cut-Out, Checking
    • Notes
    • Requirements
    • Testing
  • A/C Auxiliary Signal Checking
    • Notes
    • Requirements
    • Testing
• Removal & Installation
  • ECM
    • Removal
    • Installation
• Wiring Diagrams