Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDIAGRAMSWITH AUTOMATIC TRANSMISSIONWITH EXHAUST GAS RECIRCULATION
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
With Exhaust Gas Recirculation
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION With Exhaust Gas Recirculation
VACUUM SYSTEM DIAGRAM
Automatic transmission vehicles with EVAP system and EGR
NOTE:
On automatic transmission vehicles with EVAP and EGR there are two system variations.
Variation 1
1 - Vacuum brake booster
2 - Vent line from EGR solenoid valve
3 - Exhaust Gas Recirculation (EGR) valve
4 - Check valve
5 - Vacuum booster
6 - Vacuum unit for intake manifold change-over
7 - Intake manifold
8 - Ignition coils
9 - Vacuum reservoir for intake manifold change-over valve
10 - Fuel pressure regulator
11 - Restrictor 1
12 - EGR vacuum regulator solenoid valve
13 - Restrictor 2
14 - Solenoid valve for intake manifold change-over valve
15 - Air cleaner
16 - EVAP canister
17 - EVAP canister purge regulator valve
18 - Vacuum supply for solenoid valves
19 - Vent line from EGR vacuum regulator solenoid valve
20 - Throttle body
21 - Noise damper
22 - Vacuum connection for A/C and/or differential lock
Variation 2
1 - Vacuum brake booster
2 - Vent line from Exhaust Gas Recirculation (EGR) valve in Audi 100
3 - Exhaust Gas Recirculation (EGR) valve
4 - Check valve
5 - Vacuum booster
6 - Vacuum unit for intake manifold change-over valve
7 - Intake manifold
8 - Ignition coils
9 - Vacuum reservoir for intake manifold change-over valve
10 - Fuel pressure regulator
11 - EGR vacuum regulator solenoid valve
12 - Restrictor
13 - Intake manifold change-over valve
14 - Air cleaner
15 - EVAP canister
16 - EVAP canister purge regulator valve
17 - Vacuum supply for solenoid valves
18 - Not applicable
19 - Throttle body
20 - Noise damper
21 - Vacuum connection for A/C and/or differential lock
Automatic transmission vehicles with EVAP system and EGR
NOTE:
On automatic transmission vehicles with EVAP and EGR there are two system variations.
Vacuum Hose Diagram:
Variation 1
1 - Vacuum brake booster
2 - Vent line from EGR solenoid valve
3 - Exhaust Gas Recirculation (EGR) valve
4 - Check valve
5 - Vacuum booster
6 - Vacuum unit for intake manifold change-over
7 - Intake manifold
8 - Ignition coils
9 - Vacuum reservoir for intake manifold change-over valve
10 - Fuel pressure regulator
11 - Restrictor 1
12 - EGR vacuum regulator solenoid valve
13 - Restrictor 2
14 - Solenoid valve for intake manifold change-over valve
15 - Air cleaner
16 - EVAP canister
17 - EVAP canister purge regulator valve
18 - Vacuum supply for solenoid valves
19 - Vent line from EGR vacuum regulator solenoid valve
20 - Throttle body
21 - Noise damper
22 - Vacuum connection for A/C and/or differential lock
Vacuum Hose Diagram:
Variation 2
1 - Vacuum brake booster
2 - Vent line from Exhaust Gas Recirculation (EGR) valve in Audi 100
3 - Exhaust Gas Recirculation (EGR) valve
4 - Check valve
5 - Vacuum booster
6 - Vacuum unit for intake manifold change-over valve
7 - Intake manifold
8 - Ignition coils
9 - Vacuum reservoir for intake manifold change-over valve
10 - Fuel pressure regulator
11 - EGR vacuum regulator solenoid valve
12 - Restrictor
13 - Intake manifold change-over valve
14 - Air cleaner
15 - EVAP canister
16 - EVAP canister purge regulator valve
17 - Vacuum supply for solenoid valves
18 - Not applicable
19 - Throttle body
20 - Noise damper
21 - Vacuum connection for A/C and/or differential lock
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.