Lower Fuel Pressure, Checking With High Pressure Pump

Lower Fuel Pressure, Checking with High Pressure Pump

• Fuel pump (FP) control module OK

• Fuel Pump (FP) OK

• Fuel filter OK

• Battery voltage at least 11 Volts

- Turn on the ignition.

- Connect the vehicle diagnosis and service system (VAS 5052) and select the engine control module.

- Select engine electronics in OBD.

- Then select measured values read out.

- Select measured value block 103.

- During ignition, the fuel low pressure is displayed in field 1.

• By switching the ignition off and on the fuel pump control module (J538) activates the fuel pump for several seconds.

- Measure fuel pressure.

• Specified value: approximately 6 bar (5 to 8 bar)

- If the specified value is not attained, check the delivery rate of the electrical fuel pump

- Check fuel pressure and residual pressure with fuel inj. pressure gauge-CIS (V.A.G 1318). Refer to => [ Fuel Pressure and Residual Pressure before High Pressure Pump, Checking ] Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking.