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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI2004A6 QUATTRO, 2.7 D, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSON BOARD DIAGNOSTIC (OBD) - 2001 AND UPANTI-THEFT IMMOBILIZER, ON BOARD DIAGNOSTIC (OBD)ADAPTATION AFTER REPLACING ENGINE CONTROL MODULE (ECM)PROCEDURE
2004 Audi A6 Quattro, 2.7 D, Standard
Adaptation after replacing Engine Control Module (ECM): Procedure
2004 Audi A6 Quattro, 2.7 D, StandardSECTION Procedure
- Initiate On Board Diagnostic (OBD) of immobilizer. See IMMOBILIZER ON BOARD DIAGNOSTIC (OBD), INITIATING .
Display on VAS 5051:
- Control module identification of the instrument cluster
- Control module identification of immobilizer
Using the 14 digit identification number of the ECM, determine the 7-digit PIN. See LOST KEY PROCEDURE .
- Click on --> button
Display on VAS 5051:
- Select diagnostic function "06 - End Output" in selection -1-.
Display on VAS 5051:
- Press selection -1- of vehicle system "01 -Engine electronics".
- Wait until the next indication appears on display.
Display on VAS 5051:
- Control module identification of Engine Control Module (ECM).
- Control module identification of immobilizer
CONTROL MODULE IDENTIFICATION - ANTI-THEFT IMMOBILIZER
| Control module identification anti-theft immobilizer | |
|---|---|
| XXXXXXXXXXXXXXXXX XXXXXXXXXXXXXX | |
NOTE:
If a used Engine Control Module (ECM) is being installed, it must first be switched free via a login procedure. See LOGIN PROCEDURE, ENGINE CONTROL MODULE (ECM)
. The 7-digit PIN must be determined via the 14-digit identification number of the used Engine Control Module (ECM). Continue as follows after successful login procedure:
- Click on --> button
Display on VAS 5051:
- In selection -1-, select the diagnostic function "10 - Adaptation".
Display on VAS 5051:
- Enter channel number Max. input value = 99
- Select function "50" in button field -2- for "Adaptation channel 50" and press Q button to confirm input.
Display on VAS 5051:
- Channel 50 read and test
- PIN ?
- Keypad - only direct input via the keypad is possible
- Sliding bar is positioned on 32000
- Press "Keypad" button -3-.
Display on VAS 5051:
- Enter adaptation value Input value: 0 to 65535
- Enter previously determined 7-digit PIN (of instrument cluster) in button field -2-.
- Press -Q- button to confirm input.
NOTE:
If the 7-digit PIN is entered incorrectly three times, tester display will indicate "locked 10". This locking time can also be indicated in measuring value block 024 (display field 1). Adaptation is now locked for 10 minutes. This time is doubled after every third consecutive incorrect attempt, up to a maximum of 255 minutes.
- Wait until the next indication appears on display.
NOTE:
If a malfunction occurs during adaptation, the following DTCs can be displayed:
- "Interference": CAN-bus not available or engine speed recognized (adaptation only with the engine standing still)
- "Adaptation not OK": Instrument cluster cannot give out data (17-digit VIN, 14-digit identification number), since the control module is still new (factory condition) or the data is faulty.
- "System not OK": Instrument cluster does not give out data, since it was previously used with a control module (Engine Control Module) with another performance class (tuning-protection).
- "Key not OK": Data cannot be given out or accepted, because no key or no matching key is available.
If no malfunction is present, this display appears:
Display on VAS 5051:
Fig 10: Display On VAS 5051 - Immobilizer Adaptation After Replacing Engine Control Module (9 Of 11)
- 1 - Channel 50 read and test
- 2 - 17-digit VIN (Vehicle Identification Number)
- 5 - Sliding bar is positioned on 32000
- Press "Save" button -4-.
Display on VAS 5051:
Fig 11: Display On VAS 5051 - Immobilizer Adaptation After Replacing Engine Control Module (10 Of 11)
- 1 - Channel 50 save
- 2 - 17-digit VIN (Vehicle Identification Number)
- 4 - original value 32000 new value 32000
- Confirm new adaptation value by pressing the "take over" button -3-.
Display on VAS 5051:
Fig 12: Display On VAS 5051 - Immobilizer Adaptation After Replacing Engine Control Module (11 Of 11)
- Channel 50 Value 32000 stored
- End function "10 - Adaptation" by pressing <-- button.
Adaptation of the Engine Control Module (ECM) to the immobilizer has been completed and the vehicle can be started.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.