TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
Checking proper seal
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Switch ignition on.
NOTE: After switching ignition on, Fuel Pump (FP) will run continuously, even with engine not running. This is true because: Fuel Pump (FP) relay is
supplied with B+ via central electrics after ignition is switched on. Fuel Pump (FP) relay receives negative via the cable bridge in test box.
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Check proper seal of fuel injectors (visual inspection). With Fuel Pump (FP) running, only 1-2 drops per minute may drip out per injector.
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If fuel loss is greater, stop Fuel Pump (FP) from running (switch off ignition) and replace faulty fuel injector.
Checking injection quantity
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Insert fuel injector to be tested in a measuring glass from VAG1602 injection quantity test device.
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Connect one terminal of fuel injector to engine Ground (GND) using an adapter cable and an alligator clip from VAG1594A connector test kit.
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Connect the second terminal of fuel injector to B+ using VAG1348/3A remote control, VAG1348/3-2 adapter cable and assisting cable.
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Switch ignition on.
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Fuel Pump (FP) must run.
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Activate VAG1348/3A remote control for 30 seconds.
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Perform measurement on all fuel injectors.
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After all four fuel injectors have been activated, place measuring glasses on an even surface.
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Specified value for each fuel injector: 179 ± 14 ml
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If measured value of one or more fuel injectors is outside of specified range, switch Fuel Pump (FP) off (switch ignition off) and replace faulty
fuel injector.
NOTE: Also check spray pattern when checking injection quantity. Spray pattern must be the same for all injectors
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Re-install fuel injectors together with fuel rail.