Target Audience:
Audi enthusiasts, DIY mechanics, professional automotive technicians
Usefulness For Restoration:
Essential for electrical system diagnosis and repair during restoration projects
Manual Type Advantage:
Specialized focus on electrical systems, offering depth beyond general service manuals
Direct Factory Information:
Provides access to manufacturer-level technical data
Troubleshooting Efficiency:
Enables faster and more accurate diagnosis of electrical problems
Electrical System Overview:
Comprehensive coverage of the vehicle's entire electrical architecture
Wiring Harnesses:
Detailed diagrams for all main and sub-wiring harnesses
Lighting Systems:
Headlights, taillights, interior lighting, fog lamps, turn signals
Ignition System:
Ignition coil, distributor (if applicable), spark plugs, ignition control module
Starting System:
Starter motor, starter solenoid, ignition switch
Charging System:
Alternator, voltage regulator, battery connections
Fuel System Electronics:
Fuel pump, fuel injectors, engine control unit (ECU) wiring
Engine Management:
Sensor wiring (MAF, MAP, O2, TPS, CTS, etc.), ECU pinouts
Cooling System Electronics:
Coolant temperature sensor, radiator fan control
Instrument Panel:
Gauges, warning lights, indicators, odometer
Audio System:
Factory radio, speaker wiring, antenna connections
Power Accessories:
Power windows, power locks, power mirrors, sunroof (if equipped)
Wipers Washers:
Wiper motor, washer pump, controls
HVAC Controls:
Blower motor, climate control module wiring
Anti Theft System:
Immobilizer wiring (if equipped), alarm system components
ABS System:
Anti-lock braking system sensor and control module wiring
Airbag System:
Airbag control module, sensor wiring, deployment circuits
Trailer Lighting Interface:
Wiring for trailer towing connections
Troubleshooting Guides:
Systematic diagnostic procedures for electrical faults
Component Testing:
Methods for testing individual electrical components (e.g., relays, switches, motors)
Wiring Repair:
Techniques for splicing, soldering, and repairing damaged wires
Fuse Relay Identification:
Location and function of all fuses and relays
Component Replacement:
Wiring procedures for replacing components like alternators, starters, sensors
Connector Pinouts:
Detailed pin identification for all major electrical connectors
Ground Point Locations:
Identification of all chassis and system ground points
Diagnostic Charts:
Diagnostic flowcharts for common electrical issues
Wiring Diagram Interpretation:
Guidance on understanding and reading complex wiring diagrams
Component Specifications:
Electrical specifications for key components (resistance, voltage drop, etc.)
ECU Functionality:
Basic understanding of ECU inputs and outputs related to wiring
Circuit Protection:
Details on fuses, circuit breakers, and fusible links
Engine Options Covered:
1.6L, 1.8L, 2.0L, 2.3L 5-cylinder, 2.6L V6, 2.8L V6
Typical Horsepower Range:
70-170 hp (depending on engine variant)
Typical Torque Range:
110-230 Nm (depending on engine variant)
Fuel Delivery:
Bosch Motronic fuel injection (various versions)
ECM Type:
Various Bosch Motronic ECUs (e.g., M2.3.2, M2.10, M2.4.2)
Oil Change Interval:
Typically 10,000-15,000 km (6,000-9,000 miles) or 12 months (refer to specific vehicle service book)
Timing Belt Replacement:
Around 90,000-120,000 km (56,000-75,000 miles) for most gasoline engines (crucial for interference engines)
Engine Oil Type:
API SG/SH, ACEA A2/A3, SAE 5W-40, 10W-40, or 15W-40 (depending on climate and engine, e.g., Castrol GTX)
Coolant Type:
G11 (VW TL 774-C) coolant concentrate, typically a 50/50 mix with distilled water
Transmission Fluid Manual:
G 005 297 (or equivalent GL-4 rated gear oil)
Transmission Fluid Automatic:
ATF Dexron III (e.g., G 052 990)
Electrical Gremlins:
Corrosion in connectors, failing door lock actuators, faulty window regulators, intermittent gauge operation
Cooling System:
Leaking coolant flanges, failing water pump, radiator issues
Suspension:
Worn control arm bushings, ball joints, shock absorbers
Engine Specific:
Oil leaks from valve cover gaskets, intake manifold gaskets, oil pan gaskets; distributor seal leaks (5-cyl); camshaft seal leaks
Audi Legacy:
Continuation of Audi's reputation for build quality and engineering in the compact executive class.
B4 Generation Introduction:
Introduced in 1991 as a significant redesign of the Audi 80/90 series.
European Market Positioning:
Competed with models like the BMW 3 Series, Mercedes-Benz 190E, and Opel Vectra.
North American Market Positioning:
Marketed as Audi 90 in North America (with larger engines and Quattro standard on many models).
Production Years:
1991-1996 (for B4 generation)
Manufacturing Location:
Ingolstadt, Germany