TDI injection and glow plug system (8-cyl. 4.2 ltr. 4-valve common rail) — Bleeding fuel system (engine codes CCFA and CCFC) — AUDI

🧭 Before you start

Fits: Audi Q7 (4L, 2005–2015)

Don't miss

• The fuel pump must run for approx. 1 minute to ensure that the fuel system is filled sufficiently with fuel.
• If there is any air left in the fuel system, the engine may switch to the backup mode ('emergency running' mode) during the road test. Switch off the engine and erase the event memory. Then continue the road test.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ If components of the fuel system between the fuel tank and the high-pressure pump are removed or renewed, the first fuel filling operation must be performed.If a fuel pump, fuel line (between fuel tank and high-pressure pump) or fuel filter is removed or renewed, the fuel system must be bled before the engine is started for the first time.If the high-pressure pump is removed or renewed, the fuel system must be bled before the engine is started for the first time. — Connect a .
2. Switch on ignition.
3. Select "“Engine electronics”" in vehicle self-diagnosis.
4. Then select "“Basic setting”".
5. Select "“Checking fuel system pressurisation pump”" from the list.

6. Press "“Start”" key: The fuel pump will start running.
7. The fuel pump must run for approx. 1 minute to ensure that the fuel system is filled sufficiently with fuel.
8. Start engine after filling fuel system.
9. Run engine at moderate speed for several minutes and then switch off.
10. Check fuel system for leaks.
11. Erase event memory.
12. After completing the repair, road-test the vehicle. Accelerate with full throttle at least once. Then check the high-pressure section of the fuel system again for leaks. [Note: If there is any air left in the fuel system, the engine may switch to the backup mode ('emergency running' mode) during the road test. Switch off the engine and erase the event memory. Then continue the road test.]
13. Interrogate event memory.

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