volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Fuel Injectors For Injection Quantity and Proper Seal, Checking|Page 5127 > < Fuel Injectors For Injection Quantity and Proper Seal, Checking|Page 5125
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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

Fuel Injectors For Injection Quantity and Proper Seal, Checking|Page 5127 > < Fuel Injectors For Injection Quantity and Proper Seal, Checking|Page 5125