A8 Quattro Sedan V8-4.2L (AUX) (2001)
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Check whether the engine speed shown in display zone 1 (actual engine speed) is within the specified tolerance range (650 to 720 RPM).
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When the engine is idling the engine control module tries constantly to adjust the actual engine speed so that it matches the specified value.
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This means that the actual engine speed when idling should always be approximately the same as the specified engine speed.
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Display fields 3 and 4 provide additional in formation which is not relevant when checking the idle speed.
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Press -> button.
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Press buttons -0- and -6- to select function "End Output" and confirm entry with -Q- button.
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If readout does not match specification, check DTC memory again.
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If DTC memory was erased, generate readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness
Code" See: Powertrain Management/Computers and Control Systems/Testing and Inspection
If the idle speed is too high or too low, or if the engine does not idle smoothly, and there are no malfunctions stored in the DTC memory, carry out the
following tests (marked with dots):
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Check oxygen sensor learned values and oxygen sensor control.
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Check for un-metered air (air leaks) in the intake system.
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EVAP canister purge regulator valve constantly open, check. See: Powertrain Management/Emission Control Systems/Evaporative Emissions
System/Canister Purge Control Valve/Testing and Inspection
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Adaptation of Throttle Valve Control Module.
Relevance of figures in 5-digit readout in Display Group 056
