Replacing diesel direct injection system control unit J248 (without protective housing) — AUDI

🧭 Before you start

Fits: Audi A8 D2 (4D)

Don't miss

• Connect up fault reader and select vehicle system "“01 - Engine electronics”" from list. When doing this, the ignition must be switched on.
• Always start by displaying and printing out the control unit identification.
• On vehicles fitted with cruise control (can be seen from steering column switch), this must be activated in the engine control unit.

🔧 Engine codes this applies to

📋 Procedure

1. Connect up fault reader and select vehicle system "“01 - Engine electronics”" from list. When doing this, the ignition must be switched on.
2. Always start by displaying and printing out the control unit identification.
3. Switch off ignition.
4. Slacken off cross-head bolts (1) at electronics box in plenum chamber.
5. Unclip plenum chamber cover (2) at front at bulkhead (arrows).

6. Detach plenum chamber cover.
7. Prise out cover (1) in scuttle panel trim and slacken off rear cross-head bolt (arrow) at rear right.
8. Slacken off the remaining cross-head bolts (arrows).
9. Detach cover of electronics box in plenum chamber.
10. Screw out bolt (arrow).
11. Disengage retainer.
12. Release and unplug connectors of diesel direct injection system control unit J248"“Item 1”".
13. Take out old diesel direct injection system control unit J248"“Item 1”" and install new engine control unit.
14. Interrogate fault memory and erase if necessary.
15. Encode new engine control unit .
16. On vehicles fitted with cruise control (can be seen from steering column switch), this must be activated in the engine control unit.
17. Adapt immobilizer to engine control unit using the "“Guided fault-finding”" function:

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