Audi Workshop Service and Repair Manuals

Test conditions

• ● Coolant temperature must be at least 80 °C.
• ● All electrical consumers like e.g. rear window heating must be switched off.
• ● If the vehicle is equipped with an air conditioner, this must be switched off.
• ● On vehicles with an automatic gearbox the selector lever must be in P or N.

• ‒ Connect vehicle diagnostic, testing and information system VAS 5051 (or fault reader V.A.G 1551) and select engine electronics control unit by entering address word "01" ().
  When doing this the engine must be running at idling speed.

• ‒ Press keys 0 and 4 for function "Basic setting" and confirm entry by pressing Q.

• ‒ Press key 0 three times to select display group "00" and confirm entry by pressing key Q.

Specifications for display group 00

This display group is used for the dynamic test of the commencement of injection. The commencement of injection valve -N108 is activated constantly so that the injection timing control will move to the retarded position.

• ‒ → The commencement of injection value in display zone 2 varies in accordance with the fuel temperature value in display zone 9.

• Specification: => range C in illustration
• A - Zone 2 commencement of injection
• B - Zone 9 fuel temperature

Notes:

• ◆ If the commencement of injection is advanced turn injection pump in engine direction of rotation, if the commencement of injection is retarded turn against direction of rotation.
• ◆ If when checking the commencement of injection the specifications are within zone -C- then no adjustment is required. After repairs e.g. removing and installing injection pump, adjusting timing then the commencement of injection is to be set to the mean valve (dashed line) of specification zone -C-.

If the specifications within zone C are not met:

• ‒ Adjust commencement of injection => Page 23-26.

Display Group 03 at idling speed

This display group is used for testing the exhaust gas recirculation. The exhaust gas recirculation valve -N18 opens and closes alternately for periods of 10 seconds.

Display Group 11 at idling speed

This display group is used for testing the boost (charge) pressure control. The boost pressure control solenoid valve -N75 opens and closes alternately for periods of 10 seconds.