SEAT Workshop Service and Repair Manuals

Checking fuel pressure sender Special tools and workshop equipment required

t  Assembly tool -T10118- t  "Socket wrench insert, double hexagon 1/2“, 27 mm" -VAS 5301/7- t  Digital pressure gauge -VAS 6394/1- t  Adapter for the testing functions -VAS 5570-   WARNING The injection system is sub-divided into a high pressure system (max. approx. 120 bar) and a low pressure system (approx. 6 bar). Prior to opening the high-pressure area, e.g. when removing the high-pressure pump, fuel rail, injectors, a fuel line, or the fuel pressure sender -G247-, the fuel pressure in the high-pressure area must be reduced to a residual pressure of approx. 6 bar. The appropriate procedure is described in the chapter on releasing pressure in the high-pressure section → Chapter. Operation process

–  Lift off engine cover panel at points -1- and pull it forwards in direction of -arrow-. –  Remove air filter → Chapter.

–  Remove fuel pressure sender -G247--1-.

–  Instead of fuel pressure sender -G247-, screw in adapter -VAS 6394/2- and tighten to 22 Nm.

–  Open cover -2- of digital pressure gauge -VAS 6394/1- and tighten fuel pressure sender -G247- to digital pressure gauge to 22 Nm. –  Screw pressure line -1- of digital pressure gauge -VAS 6394/2- hand-tight to adapter -VAS 6394/1-.

–  Connect test adapter -VAS 5570- between fuel pressure sender -G247--1- and connector.

–  Connect vehicle diagnosis, testing and information system -VAS 5051B--1- as follows: –  Push diagnostic cable connector -2- onto diagnostic connection in driver footwell. –  Switch on ignition. –  Press following keys on display in succession: Vehicle self-diagnosis Vehicle self-diagnosis 01 - Engine electronics 011 - Measured values –  There, enter 140 and acknowledge with Q. Display field 2 shows the nominal value; display field 3 shows the actual value reported to the vehicle by the fuel pressure sender -G247-.

–  Switch on digital pressure gauge -VAS 6394/1- by pressing key -A- briefly once.   Note When button -A- is pressed for 2 seconds, the illumination will be switched on for 20 seconds. Digital pressure gauge -VAS 6394/1- should display 0 bar; if this is not the case, press key -C- briefly once for zero point compensation. –  Start engine. –  Compare pressure displayed by digital pressure gauge -VAS 6394/1- with actual value of vehicle diagnosis, testing and information system -VAS 5051B-. The pressures may deviate by up to 5 bar. If pressures do not correspond, fuel pressure sender -G247- must be renewed.   WARNING The injection system is sub-divided into a high pressure system (max. approx. 120 bar) and a low pressure system (approx. 6 bar). Prior to opening the high-pressure area, e.g. when removing the high-pressure pump, fuel rail, injectors, a fuel line, or the fuel pressure sender -G247-, the fuel pressure in the high-pressure area must be reduced to a residual pressure of approx. 6 bar. The appropriate procedure is described in the chapter on releasing pressure in the high-pressure section → Chapter.   Note Once the high-pressure in the high-pressure area is reduced, open the system immediately as the pressure will rise again due to warming. –  Renew fuel pressure sender -G247- and again compare both measured values. If measured values again fail to correspond: –  Check wiring → Vehicle diagnostic tester. If measured values correspond: –  Further testing is carried out with „Guided Fault Finding“ → Vehicle diagnostic tester.