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| Switch on the pressure tester -VAS 6394/1- by pressing the switch -A- once. |
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| If the -A- button is pressed for 2 seconds, the lighting illuminates for 20 seconds. |
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| If the digital pressure gauge -VAS 6394/1- reading is not 0 bar, carry out a zero calibration procedure → operating instructions. |
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| Connect vehicle diagnosis tester to diagnostic connection. |
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| Select the following options one after another on the display of the vehicle diagnosis device: |
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| Select the measured value block 140 and confirm with Q. |
| The actual fuel pressure value is shown in display zone 3, measured by the fuel pressure sender -G247-. |
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| The value displayed on the pressure tester -VAS 6394/1- is compared with the pressure displayed on the vehicle diagnosis device. |
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| The pressure difference should not be more than 5 bar. |
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| When the difference is more then 5 bar, the fuel pressure sender -G247- must be replaced. |
WARNING | The pressure tester -VAS 6394- is under high fuel pressure. Disconnect the connector from the fuel pressure sender -G247- when the engine is running. This should result in the fuel pressure dropping to approx. 6 bar. Switch ignition OFF. Wrap a clean cloth around the fuel pressure sender -G247- and then dissipate the residual pressure by carefully loosening the fuel pressure sender -G247-. |
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| Repeat the test with the new fuel pressure sender -G247- and compare the two pressure values. |
| If the values still do not correspond: |
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