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 power system
The order of operation of the cylinders 4-cylinder engines 1–3–4–2 5-cylinder engines 1–2–4–5–3 Maximum engine speed 1Z and AHU 5200 rpm ABP, AAT and AEL 5500...

Air filter
Withdrawal 1. Disconnect the air tube. Release the clips and remove the air filter cover. 2. Remove the air filter. 3. Loosen the fixing bolt. 4. Remove the...

Accelerator cable and accelerator pedal elements
Accelerator cable (AAS) Withdrawal 1. Remove the trim panel and disconnect the cable from the pedal. 2. In an impellent compartment remove a fixing clip and...

Fuel level sensor
Withdrawal 1. Remove the handles (body type models "station wagon"). 2. Loosen the fixing screws and remove the cover. 3. Disconnect the sensor connector. 4....

Fuel tank
Withdrawal 1. Disconnect the fuel level sensor connector and fuel hoses. 2. Unscrew the fixing screw of the filler neck. 3. Remove the filler hose. 4. Install...

Injection pump (engines 1Z and AHU)
Withdrawal 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...

Injection pump (ABP, AAT and AEL engines)
Withdrawal 1. Remove the injection pump cover. 2. Set the piston of cylinder N1 to TDC. Mark the position of the TDC mark on the pump pulley/sprocket (1) in...

Injection pump (AAS engine)
Withdrawal 1. Remove the plastic cover. 2. Tag and disconnect the wires from the injection pump. Disconnect the cables. 3. Disconnect the fuel hoses from the...

Idle speed and maximum engine speed AAS
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, turn the expanding element installed in the injection pump cover as needed.

Remaining fuel volume (AAS engine)
Normally, the residual fuel volume adjusting screw does not require adjustment, however, if the idle speed is too high and cannot be adjusted with the idle...

Fuel injectors
Injectors are recommended to be replaced every 100,000 km. To find a faulty injector, put rags around the injectors and disconnect the fuel pipes from the...

Diesel engine management system
Accelerator pedal position sensor Withdrawal 1. Remove trim panel. 2. Disconnect the cable, return spring and remove the pedal from the bracket. 3. Loosen the...

Intake manifold
Withdrawal 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...

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A6(C5-AR, 1999-2005)

A6(C5, 1997-2004)

A6(C4, 1994-1997)