Jetta L4-2.0L (AZG) (2004)
Fuel Injector: Testing and Inspection
Fuel Injectors, Check
Check Fuel Injectors
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1527 voltage test lamp
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VAG1594 connector test kit
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Wiring diagram
Test requirements
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The respective fuses of fuel injectors (N30 to N33) must be OK.
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Fuel Pump (FP) Relay -J17- must be OK, check.
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Battery voltage must be at least 11.5 volts.
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All electrical consumers like, for example, lights and rear window heating must be switched off.
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Parking brake must be engaged or else daylight driving lights will be switched on.
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For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
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If vehicle is equipped with an A/C system, it must be switched off.
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Ground (GND) connections between engine and chassis must be OK.
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Engine speed (RPM) sensor must be OK, checking. See: Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Engine Speed (RPM) Sensor, Checking
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Ignition switched off.
Test sequence
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Remove upper part of intake manifold, Intake manifold, upper part, disassembling and assembling.
NOTE:
Seal the intake channels in lower part of intake manifold using a clean rag.
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Disconnect fuel injector connectors.
Resistance values of fuel injectors, checking
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Test resistance of fuel injectors between terminals. Specified value: 14 ... 18 Ohms
NOTE:
Resistance value is valid at approx. 20°C. At higher temperatures, resistance value increases.