Cabrio GLX L4-2.0L (ABA) (2001)
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Fuel Injector: Testing and Inspection
Fuel Injectors, Checking
Fuel Injectors, Checking
Special tools and equipment
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VAG 1551 Scan Tool or VAG 1552 with cable VAG 1551/3
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Test box VAG 1598/22
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Hand multimeter VAG 1526 or multimeter VAG 1715
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Diode test lamp VAG 1527
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Adapter set VAG 1594
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Wiring diagram
Check conditions
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Engine speed sensor must be OK, checking See: Computers and Control Systems/Engine Speed Sensor/Testing and Inspection
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Fuel pump relay must be OK
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Fuses 28 and 32 must be OK.
WARNING: Fuel system is under pressure. Before opening the system place a cloth around the connection. Then release pressure by carefully
loosening the connection.
Test sequence
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First check the activation of the injectors via Output Diagnostic Test Mode (DTM) See: Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures.
If one or more injectors do not click:
Checking activation and voltage supply
If injectors of cylinder No. 2 or 3 do not click:
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Remove intake manifold upper section.
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Pull connector off injector No. 2 or 3.
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Connect diode test lamp VAG 1527 using auxiliary cables from VAG 1594 to connector contacts of Cyl. 3.
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Operate starter and check the voltage supply for No. 3 cylinder injector.
The LED must flicker
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Repeat check at injector connector for No. 2 cylinder.
If injectors of cylinder No. 1 or 4 do not click:
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Pull connector off injector No. 1 or 4.
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Connect diode test lamp VAG 1527 using auxiliary cables from VAG 1594 to connector contacts of Cyl. 1.
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Operate starter and check voltage supply for No.1 cylinder injector.
The LED must flicker
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Repeat check at injector connector for No. 4 cylinder.
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Switch ignition off.
If the LED does not flicker on any cylinder:
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Connect diode test lamp to Cyl. 1 connector, contact 1 and Ground.
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Initiate Output Diagnostic Test Mode (DTM) again and activate No. 1 cylinder injector.
The LED must light up
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Repeat check at injector connectors for Cyls. 2 through 4.
