Audi Workshop Service and Repair Manuals

Test conditions

• ● No leaks in exhaust system
• ● Coolant temperature at least 80 °C
• ● Throttle valve in idling position

=> 4-cylinder Engine, Mechanics; Repair group 20; Fuel supply system; Servicing throttle mechanism

• ● Electrical consumers switched off (radiator fan must not run during the check)
• ● Air conditioner switched off
• ● Pressure gauge not connected
• ● Selector lever in position P or N

Testing idling speed

Notes:

• ◆ The idling speed cannot be adjusted.
• ◆ The idling speed is regulated by the engine control unit via the throttle valve control unit.

• ‒ Interrogate fault memory =>Page 01-10. The fault memory must be clear. If necessary, rectify any faults and erase the fault memory. Switch off the engine, then start up again. Take vehicle for a test drive and interrogate the fault memory again to make sure it is clear.
• ‒ Leave engine idling.
• ‒ Switch off air conditioner.
• ‒ Switch off rear window heating.
• ‒ Place selector lever in P or N position (automatic gearboxes).
• ‒ Read measured value block (select function 08, Display Group 01 =>Page 01-79).

• ‒ Read off idling speed from display zone 1.

Specification: 760...880 rpm

• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
• ‒ If the value does not match the specification, interrogate the fault memory again =>Page 01-10.

If the idling speed is too high or too low and there are no faults recorded in the fault memory, carry out the following tests:

• ● Test idling switch =>Page 24-74.
• ● Large quantity of unmetered air => see "Read measured value block", Display Group 03, 08 or 99.
• ● Test throttle valve control unit =>Page 24-67.