S8 Quattro Sedan V8-4.2L (AYS) (2002)
Idle Speed: Testing and Inspection
Idle Speed Checking
Test conditions
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No leaks in exhaust system
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Coolant temperature at least 85 °C (185 °F)
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Electrical consumers switched off (radiator fan must not run during the check)
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A/C switched off
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Pressure gauge not connected
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Selector lever in position P or N (vehicles with automatic transmission)
Checking idle speed
NOTE:
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The idle speed cannot be adjusted.
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The idle speed is tested during the basic setting of the engine.
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During the basic setting of the engine the A/C compressor is automatically switched off and the EVAP canister purge regulator valve is closed.
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Check DTC memory. The DTC memory must be clear. If necessary, repair any malfunctions and erase the DTC memory. Switch off the engine,
then start up again. Take vehicle for a test drive and check DTC memory again to make sure it is clear.
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Run engine at idle speed.
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Switch off A/C.
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Switch off rear window heating.
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Place selector lever in P or N position (automatic transmission).
CAUTION!
The electric radiator fan should not be running.
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -4- to select function "Basic Setting" and confirm entry with -Q- button.
Indicated on display
Basic Setting
Input display group number XXX
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Press buttons -0- -5- and -6- to select "Display group number 056" and confirm entry with -Q- button.
NOTE:
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The value shown in display field 1 is the actual engine speed.
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The value shown in display field 2 (specified engine speed) is a theoretical value calculated by the engine control module.
Indicated on display: (1 - 4 = display zones)
System in Basic Setting 56
->
1
2
3
4