(High Pressure Fuel Pump Diagnosis):
Completing the GFF high pressure pump function test is essential to diagnose proper pump operation and to avoid unnecessary replacements. Guided fault finding provides a function test for the high pressure fuel pump. This test must be performed in order to properly diagnose the high pressure fuel pump.
This document discusses the "Fault Codes" necessary to diagnosis, and potential remedy of the issue. The fault codes for checking warranty coverage for servicing the vehicle are also available.