Testing Idling Speed - Audi A8 1994 Service Manual

Motronic injection and ignition system (6-cylinder) - Edition 02.1999

1.10 - Testing idling speed

Test conditions
• No leaks in exhaust system
• Coolant temperature at least 80 °C
• 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 (vehicles with automatic gearbox)
Testing idling speed
Notes:
◆ The idling speed cannot be adjusted.
◆ The idling speed is tested during the basic setting of the engine.
◆ During the basic setting of the engine the air conditioner compressor is automatically switched off and the
solenoid valve for the activated charcoal filter (ACF valve) is closed.
- Interrogate fault memory. 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 the vehicle for a test drive and interrogate the fault
memory again to make sure it is clear.
- Run the engine at idling speed.
Warning!
The electric radiator fan should not be running.
-> Indicated on display:
Rapid data transfer
Select function XX
- Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with the Q key.
-> Indicated on display:
Basic setting
Enter display group number XXX
- Press keys 0, 5 and 6 for Display Group 56 and confirm entry with the Q key.
-> Indicated on display:
(1...4 = display zones)
System in basic setting
1 2 3
- Check whether the engine speed shown in display zone 1 (actual engine speed) is within the specified
tolerance range.
Display Group 56: Idling speed stabilisation with engine idling at normal operating temperature
Display
Indicates
Range
Specification same as display zone 2 ±20 rpm
HELP
56
4
1
xxx rpm
Engine speed
(actual)
min.: 550 rpm
max.: 6600 rpm
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Display zones
2
xxx rpm
Engine speed Idling speed control
(specified) - torque change
min.: 550 rpm
max.: 6600 rpm
650 ... 750 rpm
Audi A8 1994 ➤
3
x.x % 0 0 0 0 0
Operating status
x.x % 0 0 0 0 0
1.10 - Testing idling speed
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