LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Audi
>>
2002
>>
S4 Quattro, Automatic
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Controls - System & Component Testing
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Engine Controls - System & Component Testing
Expand All (for easy ctrl-f)
Collapse All
Introduction
Component Locations
Air Induction Systems
Electronic Throttle Control
Idle Control System
All Models
Intake Manifold Change-Over Valve
Throttle Valve Control Module
Turbocharger
Recirculating Valve For Turbocharger
WASTEGATE Bypass Regulator Valve
Computerized Engine Controls
Data Transfer Between Engine Control Module & Can-Bus Capable Control Modules
Engine Control Module Power Supply
Engine Control Module Power Supply Relay
Sensors & Switches
Heated Oxygen Sensors
Notes
Bank 1 Heated Oxygen Sensor 1
Bank 1 Heated Oxygen Sensor 2
Bank 2 Heated Oxygen Sensor 1
Bank 2 Heated Oxygen Sensor 2
Engine Coolant Temperature Sensor
Engine Speed Sensor
Intake Air Temperature Sensor
Knock Sensor
Mass Air Flow Sensor
Throttle Position Sensor
Vehicle Speed Sensor
Modules, Motors, Relays & Solenoids
Fuel Pump Relay
Secondary Air Injection Pump Relay
Fuel Systems
Notes
Fuel Injector Test
Fuel Injector Electrical Testing
Fuel Injector Leak Test
Fuel Injector Resistance Test
Fuel Injector Quantity Test
Fuel Pressure Test
Ignition Systems
Spark Test
Ignition Coil(S)
Emission Systems & Sub-Systems
Secondary Air Injection System
Fuel Evaporative System
EVAP Leak Detection System
Crankcase Ventilation
Throttle Controls
Variable Valve Timing System
Camshaft Position Sensor
Misfire Recognition
1.8L Turbo
2.7L Turbo
3.0L
4.2L