Note.
- To perform the following work, it is necessary to use special devices, control and measuring instruments, as well as auxiliary means:
- Hinged wrench No.10 (3220).
- Device for measuring compression pressure eg (V.A.G 1763).
- Adapter (V.A.G 1763/8).
Note
- Condition for implementation of control:
- Oil temperature min. 80°C.
- Battery voltage is at least 12.5V.
1. Remove the top decorative cover (see the relevant section in this chapter).
2. Disconnect the fuel pressure regulating valve (N₂76) wiring harness connector (arrow) on the fuel rail as shown in the illustration below.
3. Start the engine briefly to allow the pressure in the fuel rail to drop.
4. Remove the glow plugs.
5. Screw the adapter into the threaded hole of the glow plug of the cylinder being tested (V.A.G 1763/6) and connect a compression measuring device (V.A.G 1763).
6. Ask the second mechanic to turn on the ignition and starter. Rotate the engine with the starter until the pressure on the compression gauge increases. Stop the engine when the pressure stops increasing.
7. Gradually measure the compression pressure in all engine cylinders.
8. Installation is carried out in the reverse order of removal. Observe the following instructions:
- Install the glow plug for the appropriate cylinder.
- Erase the engine control unit fault memory and reset the memory contents.
Note: After resetting the contents of the engine control unit fault memory, a new readiness code must be generated.