LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Audi
>>
1998
>>
Cabriolet
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Controls - System/Component Tests
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Engine Controls - System/Component Tests
Expand All (for easy ctrl-f)
Collapse All
Introduction
Engine Switches
Closed Throttle Position (CTP) Switch
Notes
2.8L
Fuel System
Notes
Fuel Pressure Release
Fuel Pressure Test
Notes
Fuel System Pressure
Fuel System Residual Pressure
Fuel Injector Test
Fuel Injector Leak Test
Fuel Injector Resistance Test
Fuel Injector Quantity Test (2.8L)
Fuel Pump Check Valve Test
2.8L
Fuel Pump Relay
A4 (1.8L Turbo) Fuel Pump Relay Function
A4 (1.8L Turbo) Voltage Supply
A4 (1.8L Turbo) Fuel Pump Relay Signal
A4 (2.8L)
Cabriolet
Ignition System
Spark Test