Fuel system (diesel) of the car Audi A6 C4
Engine management systems control the fuel injection system. To test and repair the system, it is necessary to use special test equipment. Therefore, in case of detection of a malfunction, it is necessary to contact specialists.
Take precautions when working with diesel fuel and remember to depressurize the fuel system before starting repairs.
Technical characteristics of the diesel fuel system
Cylinder firing order 4-cylinder engines 1–3–4–2 5-cylinder engines 1–2–4–5–3 Maximum engine speed 1Z and AHU 5200 rpm AVR, AAT and AEL 5500 rpm AAS 4800±100...
Cylinder firing order 4-cylinder engines 1–3–4–2 5-cylinder engines 1–2–4–5–3 Maximum engine speed 1Z and AHU 5200 rpm AVR, AAT and AEL 5500 rpm AAS 4800±100...
Air filter
Removal 1. Disconnect the air duct. Release the clamps and remove the air filter cover. 2. Remove the air filter. 3. Loosen the mounting bolt. 4. Remove the...
Removal 1. Disconnect the air duct. Release the clamps and remove the air filter cover. 2. Remove the air filter. 3. Loosen the mounting bolt. 4. Remove the...
Accelerator cable and accelerator pedal components
Accelerator Cable (AAS) Removal 1. Remove the trim panel and disconnect the cable from the pedal. 2. In the engine compartment, remove the retaining clip and...
Accelerator Cable (AAS) Removal 1. Remove the trim panel and disconnect the cable from the pedal. 2. In the engine compartment, remove the retaining clip and...
Fuel level sensor
Removal 1. Remove the handles (station wagon models). 2. Loosen the mounting screws and remove the cover. 3. Disconnect the sensor connection connector. 4....
Removal 1. Remove the handles (station wagon models). 2. Loosen the mounting screws and remove the cover. 3. Disconnect the sensor connection connector. 4....
Fuel tank
Removal 1. Disconnect the fuel level sensor connector and fuel hoses. 2. Loosen the filler neck fastening screw. 3. Remove the filler neck hose. 4. Place a...
Removal 1. Disconnect the fuel level sensor connector and fuel hoses. 2. Loosen the filler neck fastening screw. 3. Remove the filler neck hose. 4. Place a...
Injection pump (1Z and AHU engines)
Removal 1. Remove the valve cover. 2. Set the piston of cylinder N1 to TDC. 3. Disconnect the fuel hoses from the pump (the arrow shows the bolt connecting the...
Removal 1. Remove the valve cover. 2. Set the piston of cylinder N1 to TDC. 3. Disconnect the fuel hoses from the pump (the arrow shows the bolt connecting the...
Injection pump (ABP, AAT and AEL engines)
Removal 1. Remove the injection pump housing. 2. Set the N1 cylinder piston to TDC. Mark the position of the TDC mark on the pump pulley/sprocket (1) in...
Removal 1. Remove the injection pump housing. 2. Set the N1 cylinder piston to TDC. Mark the position of the TDC mark on the pump pulley/sprocket (1) in...
Injection pump (AAS engine)
Removal 1. Remove the plastic cover. 2. Mark and disconnect the wires from the injection pump. Disconnect the cables. 3. Disconnect the fuel hoses from the...
Removal 1. Remove the plastic cover. 2. Mark and disconnect the wires from the injection pump. Disconnect the cables. 3. Disconnect the fuel hoses from the...
AAS engine idle speed and maximum operating speed
Idle speed 1. Warm up the engine to normal operating temperature. 2. To adjust the idle speed, turn the adjusting screw. Maximum engine speed 1. Fully depress...
Idle speed 1. Warm up the engine to normal operating temperature. 2. To adjust the idle speed, turn the adjusting screw. Maximum engine speed 1. Fully depress...
Fast Idle Mode (AAS Engine)
Adjustment To adjust the fast idle speed, turn the expanding element installed in the injection pump cover as required.
Adjustment To adjust the fast idle speed, turn the expanding element installed in the injection pump cover as required.
Residual fuel volume (AAS engine)
Normally, the residual fuel volume adjusting screw does not need to be adjusted, however, if the idle speed is too high and cannot be adjusted with the idle...
Normally, the residual fuel volume adjusting screw does not need to be adjusted, however, if the idle speed is too high and cannot be adjusted with the idle...
Fuel injectors
It is recommended to replace injectors every 100,000 km. To locate the faulty injector, place rags around the injectors and disconnect the fuel lines from the...
It is recommended to replace injectors every 100,000 km. To locate the faulty injector, place rags around the injectors and disconnect the fuel lines from the...
Diesel engine control system
Accelerator pedal position sensor Removal 1. Remove the trim panel. 2. Disconnect the cable, return spring and remove the pedal from the bracket. 3. Loosen the...
Accelerator pedal position sensor Removal 1. Remove the trim panel. 2. Disconnect the cable, return spring and remove the pedal from the bracket. 3. Loosen the...
Intake manifold
Removal 1. Remove the air filter. 2. Remove the EGR valve and pipe if necessary. 3. Disconnect the air hose. 4. Disconnect the vacuum hoses from the intake...
Removal 1. Remove the air filter. 2. Remove the EGR valve and pipe if necessary. 3. Disconnect the air hose. 4. Disconnect the vacuum hoses from the intake...
This section is available on russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
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