Jetta GLX V6-2.8L (AFP) (2002)
Engine Speed Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Engine Speed (RPM) Sensor -G28-, Checking
The engine speed (RPM) sensor -G28- is a speed and reference mark sensor. The engine will not start if there is no speed signal. If the speed signal fails
when the engine is running, it will cause the engine to stall immediately.
Special tools and equipment
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VAG1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
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VAG1598/31 test box
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Multimeter (Fluke 83 or equivalent)
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VW1594 adapter set
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Wiring diagram
Test sequence
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Disconnect grey 3-pin harness connector (arrow) from engine speed sensor.
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Measure sensor resistance between terminals 2 + 3 of harness connector to sensor.
Specified value: 480-1000 ohms
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Check sensor for short between terminals 1 + 2 as well as -1- + -3-.
Specified value: infinity ohms
If the specified values are not obtained:
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Replace engine speed (RPM) sensor -G28-, item 25. Refer under "Fuel Delivery and Air Induction/Fuel Injector", See: Powertrain
Management/Fuel Delivery and Air Induction/Service and Repair
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Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
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Display readiness code.