Audi Workshop Service and Repair Manuals

Test conditions

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

=> 4-Cylinder Engine, mechanical components; Repair group 20; fuel supply system; repair 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.

Checking idling speed

Notes:

• ◆ The idling speed cannot be adjusted.
• ◆ The idling speed should be tested during the basic setting of the engine.

• ‒ Interrogate the fault memory . No faults must be stored, if necessary, rectify fault, erase fault memory, switch off and re-start engine, perform test drive and interrogate the fault memory again as a check.
• ‒ Leave engine idling.
• ‒ Switch off the air conditioner.
• ‒ Switch off the rear window heating.
• ‒ Place the selector lever in P or N position (vehicles with automatic gearboxes).

• ‒ Select the function "Reading measured value block" (function 08) and Display Group 5
  .

• ‒ Read off idling speed (actual) from display zone 1.
• ‒ Read off idling speed (specified) from display zone 2.

• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the function "End of output" and confirm entry with the Q key.
• ‒ If the value does not match the specification, interrogate the fault memory again =>Seite 01-7.

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:

• ● Check the idling switch => Page 24-68.
• ● Check the throttle valve control unit .
• ● Unmetered air in intake system
• ● Solenoid valve for activated carbon canister constantly open.