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| = WARNING: RESTRICTED ACCESS =
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| '''ERROR 401: UNAUTHORIZED'''
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| ------------------------------------------------------------
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| __FORCETOC__
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| = Readiness Test (UDS only) =
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| * This Tech Tip demonstrates how to perform the [Automatic test sequence] for UDS-based Engine Control Modules (ECMs) using VCDS.
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| * Basic Setting performs the required Readiness Tests on modern VW/Audi vehicles equipped with UDS protocol engine controllers.
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| * Use of this procedure is typically for after repairs or component replacement affecting emissions-related systems, or after clearing DTCs.
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|
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| ==== Special Tools ====
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| * VCDS (VAG-COM Diagnostic System)
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| ==== Prerequisites ====
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| * Engine must be running
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| * All electrical consumers OFF (A/C, headlights, rear defrost, seat heaters, etc.)
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| * No active Diagnostic Trouble Codes (DTCs) – Clear all fault codes prior to starting the test
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| * Engine coolant temperature must be at least 80°C (176°F)
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| * <span style="color:red;">Must be performed outside or in a well vented area only!</span>
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| ==== Workshop Procedure with VCDS ====
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| * Connect to the vehicle using VCDS.
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| * Go to '''[01 - Engine]'''
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| * Check for and clear any fault codes.
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| * Click on the '''[Basic Settings]''' button.
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| * Select '''[Automatic test sequence]''' or '''[Automatic test procedure]''' from the available list.
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| * Click on the '''[Show Measuring Data]''' checkbox and include the following Measuring Values:
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| {| class="wikitable"
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| |-
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| ! Measuring Value !! Description
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| |-
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| | IDE00450 || '''Operating Instructions''' – ''Follow all prompts provided here''
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| |-
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| | IDE00451 || '''Currently Running Routine''' – ''Indicates the test currently in progress''
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| |-
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| | IDE00030 || '''Status of Actuator Test''' – ''Displays overall status of test procedure''
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| |-
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| | IDE00727 || '''Test Steps Still to Be Performed''' – ''Should count down to 0 when complete''
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| |-
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| | IDE00021 || '''Engine Speed''' – ''Follow any required RPM prompts shown in Operating Instructions''
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| |-
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| | IDE00025 || '''Coolant Temperature''' – ''Should be at or above 80°C before beginning''
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| |}
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| * Click the '''[Go]''' button to begin the Basic Setting procedure.
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| * When prompted, '''press and hold both the brake and accelerator pedals simultaneously.''' Keep them pressed until the test finishes.
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| * When the test completes successfully, the '''IDE00450 [Operating Instructions]''' field will display:
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| ''''System OK'''' or ''''Finished correctly''''
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| ==== Special Notes ====
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| # The duration of the Automatic Test Sequence may vary depending on vehicle platform and engine type.
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| # If the sequence fails or does not complete, verify that all prerequisites are met, especially coolant temperature and fault-free status.
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| # This function is only available in UDS-based engine control modules. Non-UDS controllers use a different Readiness procedure, see Repair Manual.
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| # If the [Go] button is grayed out or unavailable, ensure that the engine is running and that the selected test is supported by the ECU.
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| [[Category:Tech Tips]]
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