Volkswagen Workshop Service and Repair Manuals

Checking fuel pressure sender -G247- Special tools and workshop equipment required

t  Assembly tool -T10118- t  Double hexagon socket, 1/2", 27 mm -VAS 5301/7-

t  Pressure sensor tester -VAS 6394- t  Test adapter -VAS 5570- Procedure   WARNING The fuel line is under pressure. Risk of injury to eyes and skin from fuel. Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. –  Remove fuel pressure sender -G247- → Chapter.

–  Unscrew plug -2- and screw fuel pressure sender -G247- into tester -VAS 6394/1-. Specified torque 22 Nm.

–  Moisten tapered seal of adapter -VAS 6294/2- with clean engine oil and screw into fuel rail. Specified torque: 22 Nm.

–  Connect pressure line of tester -VAS 6394/1- to adapter -VAS 6394/2-. –  Connect fuel pressure sender-1- and electrical connector of fuel pressure sender using test instrument adapter -VAS 5570-. –  Reinstall engine cover/air filter and connect air mass meter -G70-.

–  Switch tester -VAS 6394/1- on. Press button -A- once briefly for this.   Note t  When button -A- is pressed for 2 seconds, the illumination will be switched on for 20 seconds. t  If the pressure tester -VAS 6394/1- reading is not 0 bar, carry out a zero point procedure → operating instructions. –  Connect vehicle diagnosis tester to diagnostic connection. –  Switch ignition on. –  Press following buttons on display of diagnostic tester one after the other: Vehicle self-diagnosis Self-diagnosis► 01 - Engine electronics► 011 - Measured values► –  Select measured value block 140 and acknowledge with Q. The actual fuel pressure value is shown in display zone 3, measured by the fuel pressure sender -G247-. –  Start engine. –  Compare pressure displayed on tester -VAS 6394/1- with actual value displayed on vehicle diagnosis tester. l  A maximum pressure deviation of 5 bar is permissible. –  If the deviation is greater than 5 bar, renew fuel pressure sender -G247-.   WARNING The tester -VAS 6394- is under extreme fuel pressure! With engine running, pull connector off fuel pressure sender -G247-. This reduces fuel pressure to approx. 6 bar. Switch off ignition. Place a cleaning cloth around fuel pressure sender -G247-, then reduce residual pressure by carefully loosening fuel pressure sender -G247-. –  Repeat the test with the new fuel pressure sender -G247- and compare both measured values. If measured values again fail to correspond: –  Perform line test → Vehicle diagnostic tester.