TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
Fuel Injector: Testing and Inspection
Fuel Injectors Injection Quantity/Seal/Spray Pattern, Checking
Injection Quantity, Proper Seal and Spray Pattern of Fuel Injectors, Checking
Test requirement
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Fuel pressure OK, checking See: Fuel Pressure Regulator/Testing and Inspection/System Pressure, Regulator and Residual Pressure, Checking
Test sequence
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Remove fuel distributor including fuel injectors from intake manifold. Fuel lines remain connected.
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Connect VAG 1598/31 test box at wiring harness to ECM, do not connect ECM.
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Bridge terminals 1 and 65 at test box using adapter cables from VAG 1594A connector test kit (this step supplies Ground to one side of relay coil
of Fuel Pump - FP - relay).
Checking for proper seal
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Turn 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 Ground connection is via the cable bridge in test box.
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Check to make sure fuel injectors are not leaking (visual check). 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 (End Output DTM) and replace malfunctioning fuel injector.