A5 Quattro Coupe V6-3.2L (CALA) (2009)
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With engine at idle, pull fuse - SC 3 in the brown ST2 fuse holder in the driver side instrument panel - from fuel pump control module (J538).
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Check fuel pressure.
‹› The fuel pressure decreases rapidly because the mechanical high pressure pump is no longer supplied with fuel from the transfer fuel pump (G6).
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Switch ignition off as soon as fuel pressure drops to approximately 8 bar.
‹› The fuel pressure must not drop below 6 bar, because otherwise the engine will shut off (risk of catalytic converter damage).
‹› The unit "kPA" is also used instead of "bar": 1 bar = 1 kPA.
CAUTION!
The fuel lines will continue to be filled with fuel, but will no longer be under high pressure. To open fuel system, wear protective eye wear
and clothing to prevent injuries and contact with skin.
Before opening the high pressure system, place a cloth around the connection.
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After reducing fuel pressure, place a clean cloth around the connection and open the high pressure system immediately. Escaping fuel must be
absorbed.
Perform the following steps after completing all the work:
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Install fuse.
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In "Guided Functions" operating mode, generate readiness code for the engine control module.
