TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
System in Basic Setting 56
->
1
2
3
4
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Check whether the engine speed in display field 1 (actual engine speed) is within tolerated range.
Display Group 056
NOTE:
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Engine speed in display field 1 (actual engine speed) is the current engine speed.
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Engine speed in display field 2 (specified engine speed) is a theoretical engine speed calculated by the ECM.
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At idle, the ECM always attempts to adapt the engine speed (actual) to the specified engine speed (specified).
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This means that the engine speed (actual) must always approximately match the engine speed (specified) at idle.
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Display fields 3 and 4 provide information, but are not relevant for checking idle speed.
If specified value is obtained:
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Press -> button.
Indicated on display (function selection):
Rapid data transfer
HELP
Select function XX
If specified value is not obtained:
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Check DTC memory again.
If idle speed is too high or low and there are no DTCs in DTC memory, the following tests (marked with dots) must be performed:
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False air in intake air system, checking. See: Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Intake System, Checking For Leaks (Unmetered Air)
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Check throttle valve control module See: Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Throttle Valve Control Module -J338-, Checking
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Evaporative Emission (EVAP) canister purge regulator valve always open, checking. See: Computers and Control Systems/Testing and
Inspection/Component Tests and General Diagnostics/EVAP Canister Purge Regulator Valve -N80-, Checking
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Perform adaptation of throttle valve control module.
Significance of 5 digit indication of display group 056