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1991 Audi 100 CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Audi REPAIR SHOPS DON'T WANT YOU TO KNOW
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- A/C & Heater Service
- Brake Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 Audi 100 car and truck
repair procedures including Audi engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your Audi 100 automobile. Try the Automotix DIY solution today!
A/C & HEATER SERVICE PROCEDURES FOR 1991 Audi 100 AUTOMOBILES
Air Bag System Precautions -> Audi -> Disarming -> Air Bag II & III System -> Air Bag V System
Vehicle: 1991 Audi 100 2.3 L5 GAS
Air Bag II & III System
The system must be disarmed prior to disconnecting any air bag system electrical connectors or servicing any system components or other components located near an air bag system electrical connector. Obtain the radio security code prior to disconnecting the battery ground cable. Establishing the engine control module and automatic transmission control module settings may be required using scan tool No. VAG 1551, or equivalent.
- Disconnect battery ground cable and cover negative terminal.
- On 1990-92 Coupe, Quattro, 80/90 and 19...
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BRAKE SERVICE PROCEDURES FOR 1991 Audi 100 AUTOMOBILES
AUDI, ANTI-LOCK BRAKES -> TROUBLESHOOTING -> ABS RETURN PUMP DOES NOT RUN, RELAY GOOD, TESTER IN POSITION 3 -> ABS RETURN PUMP DOES NOT RUN, TESTER IN POSITION 3 -> LED 1 & 3 DO NOT LIGHT, TESTER IN POSITION 1 -> LED 13 DOES NOT LIGHT -> LED 19 DOES NOT LIGHT -> LED 2 DOES NOT LIGHT -> LED 35 DOES NOT LIGHT -> LED 4 DOES NOT LIGHT, TESTER IN POSITION 1 -> LED 4, 2, 35, 18 & 19 DO NOT LIGHT, TESTER IN POSITION 1 -> LED FOR ALTERNATOR DOES NOT GO OUT WHEN ENGINE STARTS -> LED FOR ALTERNATOR DOES NOT LIGHT, TESTER IN POSITION 2 -> LED FOR BRAKES DOES NOT GO OUT WHEN BRAKE PEDAL IS DEPRESSED -> LED FOR BRAKES DOES NOT LIGHT -> NO RESPONSE FROM SELECTED SENSOR, TESTER IN POSITION 6 -> POWER SUPPLY -> SENSOR SIGNAL ON METER BELOW MINIMUM VALUE -> Solenoid Valve Relay Check -> WRONG SOLENOID VALVE OPERATES, TESTER IN POSITION 5
Vehicle: 1991 Audi 100 2.3 L5 GAS
The Bosch ABS 2 LED-Tester or an equivalent Must be used during test procedures. Connect tester per manufacturers instructions.
POWER SUPPLY
- Check battery for full charge.
- Check that fuses 3, 12 and anti-lock brake power supply relay fuses are satisfactory. The anti-lock brake power supply relay fuse is located on top of the power supply relay.
- Check for continuity between ABS control unit connector terminal 13 and ground, at battery ground cable. Fig. .
- Turn ignition switch to the Off position.
- Check for continuity between ABS control unit connector terminal 10 and ground.
- Check for b...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1991 Audi 100 AUTOMOBILES
Audi -> Fuel Filter Replacement -> Gasoline Engines -> Removal & Installation
Vehicle: 1991 Audi 100 2.3 L5 GAS
Do not smoke or allow an open flame of any type when working on or near any fuel system related components. The highly flammable vapor mixtures may ignite, resulting in serious personal injury.
Obtain the vehicle owner's radio theft protection code, then disconnect the battery ground cable. Briefly open fuel filler cap to relieve system pressure, then close it again.
After the battery has been disconnected and reconnected, some abnormal driveability symptoms may occur. The vehicle may need to be driven while it relearns its adaptive strategy.
Removal & Installation
On A4 and S4 mod...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1991 Audi 100 AUTOMOBILES
CV AXLE SHAFT, Replace
Vehicle: 1991 Audi 100 2.3 L5 GAS
- Remove wheel cover and remove nut securing axle shaft in hub.
- Raise and support vehicle, then remove wheels. Remove shield in right side driveshaft.
- Remove driveshaft flange to transmission securing screws, then pull speed sensor slightly out of housing.
- On automatic transmission models, remove stabilizer bar clamps and disconnect ball joint from hub.
- On all models, press axle shaft from hub usi...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1991 Audi 100 AUTOMOBILES
Starter, Replace
Vehicle: 1991 Audi 100 2.3 L5 GAS
- Obtain audio coded anti-theft code, then disconnect battery ground cable.
- Disconnect electrical leads from starter solenoid.
- Remove starter mounting bolts, then the...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1991 Audi 100 AUTOMOBILES
Audi -> Auto-Check Indicator System ->
Vehicle: 1991 Audi 100 2.3 L5 GAS
The auto-check system will monitor certain vehicle systems when the ignition switch is placed in the On position and vehicle is operated. When all monitored systems are functioning properly, the system display will indicate "OK" for a few seconds after the ignition switch is placed in the On position.
This system monitors brake fluid level and hydraulic pressure, engine oil pressure, coolant temperature and level, brake pad wear, headlamps and tail lamps, battery voltage, washer fluid level and fuel level.
When the auto-check yellow or r...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1991 Audi 100 AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 1991 Audi 100 2.3 L5 GAS
Lower
- Drain coolant into a suitable container.
- Reposition hose clamp at radiator and remove hose.
- Reposition hose clamp at thermostat and remove hose.
- Remove hose from vehicle.
- Reverse procedure to ...
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COMPONENT LOCATION DIAGRAMS FOR 1991 Audi 100 AUTOMOBILES
Component location diagrams for most 1991 Audi 100 cars and light trucks sold in the U.S. from 1990+.
 Fuse/Relay Panel Diagram for 1991 Audi 100 2.3 L5 GASComponents on diagram: |
 Engine Compartment Components Diagram for 1991 Audi 100 2.3 L5 GASComponents on diagram: |
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WIRING DIAGRAMS FOR 1991 Audi 100 AUTOMOBILES
OEM drawn wiring diagrams for most 1991 Audi 100 cars and light trucks sold in the U.S.
 1991 Audi 100 2.3 L5 GAS Wiring DiagramComponents on diagram: |
 1991 Audi 100 2.3 L5 GAS Wiring DiagramComponents on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1991 Audi 100 AUTOMOBILES
OEM TSB listings for most 1991 Audi 100 cars and light trucks sold in the U.S. from 1985+.
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Document: AIRBAG / PYROTECHNIC SAFETY BELT DEPLOYMENT INQUIRIES - REVISED Vehicle: 1991 Audi 100 2.3 L5 GAS Auto Systems: |
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Document: AIRBAG, REPLACEMENT INTERVAL CHANGE - REVISED Vehicle: 1991 Audi 100 2.3 L5 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1991 Audi 100 AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1991 Audi 100 cars and light trucks sold in the U.S. and Canada from 1970+.
- Brake caliper mounting bolt torque
- Brake drum runout, machining, & discard specs
- Minimum brake lining thickness.
- Brake rotor runout, parallelism, machining, discard, & finish specs
A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 1991 Audi 100 cars and light trucks sold in the U.S. and Canada from 1980+.
- Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap
COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.
PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules
QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 1991 Audi 100 cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.
- Automatic transmission/transaxles capacities, lubricant recommendations
- Differential/final drive capacities, lube recommendations, grades, & viscosities
- Final drive fill & drain plug torques
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
- Severe service maintenance & interval recommendations
- Tire sizes, wheel nut/bolt torque, pressures & rim sizes
- Transfer case capacities, lube recommendations, grades, & viscosities
TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 1991 Audi 100 cars and light trucks sold in the U.S. and Canada from 1980+
- Airflow sensor electrical specifications
- Tensioning specifications for systems with automatic tensioners
- Barometric pressure sensor specs
- Battery group number and cranking performance
- Crankshaft & camshaft position sensor resistance
- Engine compression pressures
- Coolant temperature sensor specs
- Computer advance.
- Diesel fuel temperature sensor resistance.
- Distributor advance specifications
- Ignition pickup coil resistance
- Exhaust gas recirculation temperature sensor resistance
- Engine fastener torque values
- Firing order diagrams
- Fuel system pressures
- Generator (alternator) specs
- Intake air temperature sensor specs
- Ignition coil specifications
- Fuel injector resistance
- Engine idle speeds
- Knock sensor resistance
- Manifold absolute pressure sensor specs
- Mixture control solenoid resistance
- Voltage regulator specs
- Spark plug applications & gaps
- Starter motor electrical specs.
- Tensioning specifications for systems without automatic tensioners
- Throttle body temperature sensor resistance
- Ignition timing in degrees at rpm
- Transmission oil temperature sensor resistance
- Throttle position sensor specs
- Vacuum sensor valve specs
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