Difference between revisions of "User:Peter"

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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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==== 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]]

Revision as of 11:27, 25 July 2025

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Readiness Test (UDS only)

  • This Tech Tip demonstrates how to perform the [Automatic test sequence] for UDS-based Engine Control Modules (ECMs) using VCDS.
  • Basic Setting performs the required Readiness Tests on modern VW/Audi vehicles equipped with UDS protocol engine controllers.
  • Use of this procedure is typically for after repairs or component replacement affecting emissions-related systems, or after clearing DTCs.

Special Tools

  • VCDS (VAG-COM Diagnostic System)

Prerequisites

  • Engine must be running
  • All electrical consumers OFF (A/C, headlights, rear defrost, seat heaters, etc.)
  • No active Diagnostic Trouble Codes (DTCs) – Clear all fault codes prior to starting the test
  • Engine coolant temperature must be at least 80°C (176°F)
  • Must be performed outside or in a well vented area only!

Workshop Procedure with VCDS

  • Connect to the vehicle using VCDS.
  • Go to [01 - Engine]
  • Check for and clear any fault codes.
  • Click on the [Basic Settings] button.
  • Select [Automatic test sequence] or [Automatic test procedure] from the available list.
  • Click on the [Show Measuring Data] checkbox and include the following Measuring Values:
Measuring Value Description
IDE00450 Operating Instructions – Follow all prompts provided here
IDE00451 Currently Running Routine – Indicates the test currently in progress
IDE00030 Status of Actuator Test – Displays overall status of test procedure
IDE00727 Test Steps Still to Be Performed – Should count down to 0 when complete
IDE00021 Engine Speed – Follow any required RPM prompts shown in Operating Instructions
IDE00025 Coolant Temperature – Should be at or above 80°C before beginning
  • Click the [Go] button to begin the Basic Setting procedure.
  • When prompted, press and hold both the brake and accelerator pedals simultaneously. Keep them pressed until the test finishes.
  • When the test completes successfully, the IDE00450 [Operating Instructions] field will display:
 'System OK'   or   'Finished correctly'


Special Notes

  1. The duration of the Automatic Test Sequence may vary depending on vehicle platform and engine type.
  2. If the sequence fails or does not complete, verify that all prerequisites are met, especially coolant temperature and fault-free status.
  3. This function is only available in UDS-based engine control modules. Non-UDS controllers use a different Readiness procedure, see Repair Manual.
  4. 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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