GTI L4-2.0L Turbo (CBFA) (2008)
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Switch pressure sensor tester VAS 6394/1 on by pressing the button - A - briefly.
NOTE:
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Holding the button - A -for 2 seconds switches on the illumination for 20 seconds.
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If the pressure sensor tester VAS 6394/1 does not display 0 bar, set it back to zero operating instructions
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Connect tester to the DLC.
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Switch on ignition.
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Press the following buttons in the tester screen one after another.
Vehicle Self-Diagnosis
On Board Diagnostic (OBD) micro
01
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Engine Electronics micro
011 -
Test Instruments micro
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Select measured value block 1 4 0 and confirm with the Q button.
Display field 3 shows the fuel pressure actual value as measured by the fuel pressure sensor.
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Start engine.
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Compare pressure displayed by the pressure sensor tester VAS 6394/1 with the actual value displayed on the vehicle tester
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The pressures may have a maximum difference of 5 bar.
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If the difference is greater than 5 bar, replace the fuel pressure sensor.
CAUTION: The pressure sensor tester VAS 6394 is under high fuel pressure. Disconnect the connector from the fuel pressure sensor
when the engine is running. This reduces the pressure to approximately 6 bar. Switch off ignition. Place a rag around the fuel pressure
sensor, then carefully loosen the to release the remaining pressure.
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Repeat the test with the new fuel pressure sensor and compare both measured values.
If the measured value does not match again, perform a wiring test.