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; Removing and installing parts of the fuel supply system; Servicing accelerator cable

• ● 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 tested during the basic setting of the engine.

• ‒ Interrogate fault memory =>Page 01-7. 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.
• ‒ Run the engine at idling speed.
• ‒ 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 and Display Group 05 =>Page 01-104).

• ‒ Read off idling speed from display zone 1.

Specification: 760...840 rpm

• ‒ Press ⇒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 01-7.

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:

• ● Testing idling speed switch =>Page 24-59.
• ● Large quantity of unmetered air => see Basic setting of engine, Display Groups 01, 05 and 08.
• ● Test throttle valve control part =>Page 24-53.