Audi Q7: General, Technical data
Safety Precautions
Safety Precautions when Working on Fuel System
There is a risk of injury due to the fuel being under pressure.
The fuel system is under pressure. Injuries are possible from fuel spraying out.
Before opening the fuel system:
- Wear protective eyewear.
- Wear safety gloves.
- Reduce the pressure: place clean cloths around the connection point and carefully open the connection point.
Risk of a fire due to leaking fuel.
When the battery is connected, the door contact switch activates the fuel pump when opening the driver door. Leaking fuel can ignite and start a fire.
- Before opening the fuel system, interrupt the power supply to the fuel pump.
Perform the following steps before starting work on the fuel system:
- The fuel tank must be either completely empty or only partially filled. How much fuel can remain in the fuel tank may be read in the respective procedure description. Drain the fuel tank, if necessary. Refer to → Chapter "Fuel Tank, Draining".
- Before starting work, switch on the exhaust extraction system and place an extraction hose close to the installation opening of the fuel tank to extract escaping fuel fumes.
- If no exhaust extraction system is available, a radial fan (as long as motor is not in air flow) with a delivery volume greater than 15 m3/h can be used.
Safety Precautions when Working on Vehicles with Start/Stop System
There is a risk of injury due to the engine starting unexpectedly.
The engine can start unexpectedly on vehicles with an activated Start/Stop System. A message in the instrument cluster indicates whether the Start/Stop System is activated.
- Deactivate the Start/Stop System: switch off the ignition.
Safety Precautions during Road Test with Testing Equipment
There is a risk of injury caused by unsecured testing equipment.
If the front passenger airbag deploys during an accident, unsecured testing equipment becomes a dangerous projectile.
- Secure the testing equipment on the rear seat.
or
- Have a second person operate the testing equipment on the rear seat.
Repair Information
Guidelines for Clean Working Conditions
Even small pieces of debris can cause faults. When working on the fuel supply and injection system, observe the following guidelines for cleanliness:
- Before loosening, the connection points and surrounding areas must be cleaned thoroughly with engine or brake cleaner, and then the cleaned area must be thoroughly dried.
- Immediately seal off any open lines and connections with clean plugs, for example, taken from the Engine Bung Set -VAS6122-.
- Place removed parts on a clean surface and cover them with lint-free cloths.
- Carefully cover or seal opened components if repairs are not performed immediately.
- Only install clean parts: remove the replacement parts from their packaging just before installing them. Do not use parts that have been stored out of their original packaging (for example, in tool boxes etc.).
- If the system is open, do not work with compressed air and do not move the vehicle.
- Protect any disconnected connectors from dirt and moisture, and only connect them when they are completely dry.
Test Conditions
- Battery in battery support mode. Refer to → Electrical Equipment; Rep. Gr.27; Battery; Battery, Charging.
- Fuel Pump Fuse/Fuel Pump Control Module -J538- OK. Refer to → Wiring diagrams, Troubleshooting & Component locations.
- Fuel Pump Control Module -J538- is OK; check using the Vehicle Diagnostic Tester.
- Fuel tank is at least 1/4 full.
- Fuel filter is OK.
- Fuel lines are OK (not blocked, not crushed).
- Ignition switched off.
- All electrical equipment switched off.
Fuel System, Bleeding
- Due to the engine design and the fuel supply pump installed in the fuel tank, do not bleed the fuel system.
- The fuel system bleeds itself when the starter is operated.
Contact Corrosion
Contact corrosion can occur if incorrect fasteners (bolts, nuts, washers, etc.) are used.
For this reason, only fasteners with a special surface coating are installed.
In addition, rubber or plastic parts and adhesives consist of non-conductive materials.
If there are doubts about whether parts can be used or not, then use new parts. Refer to the Parts Catalog.
Note
- Only original replacement parts are recommended. They are checked and compatible with aluminum.
- The use of Audi accessories is recommended.
- Contact corrosion damage is not covered under warranty.
Line Routing and Securing
Caution
There is a risk of damaging the lines.
- Route all lines in their original locations.
- Because of the small spaces in the engine compartment, make sure there is enough clearance between lines and moving or hot components.
