Checking Fuel Pressure Regulator and Holding Pressure in Motronic Injection System
Motronic injection and ignition system
Checking fuel pressure regulator and holding pressure
The fuel pressure regulator control the fuel pressure dependent upon intake manifold pressure. Special tools, testers and auxiliary items
Test conditions
=> Repair Group 20; Removing and installing parts of the fuel system; Checking fuel pump Test sequence Attention!
The fuel system is pressurized! Before loosening hose connections or opening the test connection, wrap a cloth around the connection. Then release pressure by carefully pulling off the hose/sealing cap. |
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If the holding pressure drops below 2 bar:
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If the pressure drops again:
=> Repair Group 20; Removing and installing parts of the fuel system; Checking fuel pump If the pressure does not drop: |
After the pressure has built up switch off ignition and at the same time clamp-off the return pipe -with blue arrow- on fuel manifold. If the pressure does not drop:
If the pressure drops again:
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