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1991 Audi 100 Quattro CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Audi REPAIR SHOPS DON'T WANT YOU TO KNOW
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- Wiring Diagrams
- Technical Service Bulletins
- Specifications
- A/C & Heater Service
- Brake Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement

A/C & HEATER SERVICE PROCEDURES FOR 1991 Audi 100 Quattro AUTOMOBILES
Electrical Symbol & Wire Color Code Identification -> Wire Color Code Identification -> Imported Vehicles
Vehicle: 1991 Audi 100 Quattro 2.3 L5 GAS
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BRAKE SERVICE PROCEDURES FOR 1991 Audi 100 Quattro 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 Quattro 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 Quattro AUTOMOBILES
Audi -> Fuel Filter Scheduled Maintenance -> All 1989-05 -> Normal Service -> Severe Service
Vehicle: 1991 Audi 100 Quattro 2.3 L5 GAS
Normal Service
Service as re...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1991 Audi 100 Quattro AUTOMOBILES
DRIVESHAFT, Replace
Vehicle: 1991 Audi 100 Quattro 2.3 L5 GAS
Driveshaft work must be performed with vehicle on a suitable dual support hoist.
- Remove catalytic converter, then tie exhaust pipe to left side of vehicle with wire.
- Remove support, if required, then loosen propeller shaft bolts at transmission, differential and center support.
- Ensure white dot on rear propeller shaft flange aligned with a black dot on differential flange. If not, scribe mark on propeller shaft and differential flanges prior to disassembly.
- Install a suitable alignment tool on driveshaft and tighten plastic nuts.
- Remove propeller shaft bolts at transmission and d...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1991 Audi 100 Quattro AUTOMOBILES
Starter, Replace
Vehicle: 1991 Audi 100 Quattro 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 Quattro AUTOMOBILES
Audi -> Electronic Ignition Warning Lamp ->
Vehicle: 1991 Audi 100 Quattro 2.3 L5 GAS
The electronic ignition system warning lamp will be illuminated when the ignition switch is placed in the On position. After the engine is started, the lamp should go off. If the lamp lights during engine operation, a knocking condition is indicated or a problem has arisen in the ignition sys...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1991 Audi 100 Quattro AUTOMOBILES
Heater Hose, Replace -> Inlet -> Outlet
Vehicle: 1991 Audi 100 Quattro 2.3 L5 GAS
Inlet
- Drain coolant into a suitable container.
- Reposition hose clamp at heater core and remove hose.
- Reposition hose clamp at union and remove hose.
- Remove hose from vehicle.
- Reverse procedure to in...
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COMPONENT LOCATION DIAGRAMS FOR 1991 Audi 100 Quattro AUTOMOBILES
Component location diagrams for most 1991 Audi 100 Quattro cars and light trucks sold in the U.S. from 1990+.
![]() Components on diagram: |
![]() Components on diagram: |
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WIRING DIAGRAMS FOR 1991 Audi 100 Quattro AUTOMOBILES
OEM drawn wiring diagrams for most 1991 Audi 100 Quattro cars and light trucks sold in the U.S.
![]() Components on diagram: |
![]() Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1991 Audi 100 Quattro AUTOMOBILES
OEM TSB listings for most 1991 Audi 100 Quattro cars and light trucks sold in the U.S. from 1985+.
Document: AIRBAG / PYROTECHNIC SAFETY BELT DEPLOYMENT INQUIRIES - REVISED Vehicle: 1991 Audi 100 Quattro 2.3 L5 GAS Auto Systems: |
Document: AIRBAG, REPLACEMENT INTERVAL CHANGE - REVISED Vehicle: 1991 Audi 100 Quattro 2.3 L5 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1991 Audi 100 Quattro AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1991 Audi 100 Quattro 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 Quattro 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 Quattro 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 Quattro 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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