Jetta L4-1.8L Turbo (AWP) (2004)
Fuel Injector: Testing and Inspection
Fuel Injectors, Checking
With Manufacturer's Scan Tool
Special tools and equipment
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VAG1551 scan tool or VAG1552 mobile scan tool with VAG1551/3B cable
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VAG1598/31 test box
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VAG1526 hand multimeter or VAG1715 multimeter
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VAG1527 voltage tester
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VAG1594 adapter set
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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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All fuses must be OK.
Test Sequence
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First check the activation of the injectors via Output Diagnostic Test Mode. Refer to "Scan Tool Testing/Output Diagnostic Test Mode
(DTM),(Function 03)" See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Output Diagnostic Test
Mode (DTM)
If one or more injectors do not click:
Checking resistance of injectors