GLI L4-2.0L Turbo (CCTA) (2008)
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Connect the vehicle diagnosis, testing and information system (VAS 5051B) - 1 - as follows:
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Connect the diagnostic cable - 2 - to the Data Link Connector (DLC) in the driver footwell.
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Switch on the ignition.
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On the following screens, select:
Vehicle Self-Diagnosis
01 - Engine Electronics >
011 - Measured Values >
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Select the 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 the engine and let run at idle.
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Compare the pressure displayed by the (VAS 6394/1) with the actual value displayed on the (VAS 5051B).
‹› The pressures may have a maximum difference of 5 bar.
CAUTION!
The (VAS 6394/1) 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 the ignition. Place a cloth around the fuel pressure sensor , then carefully loosen
the fuel pressure sensor to release the remaining pressure.
Difference greater than 5 bar:
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Replace the fuel pressure sensor.
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Repeat the test with the new fuel pressure sensor and compare both measured values.
If the measured value do not match again:
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Check the wiring using the "Guided Fault Finding".