Jetta GLS Wagon L4-2.0L (AZG) (2002)
Engine Speed Sensor: Testing and Inspection
Engine Speed (RPM) Sensor, Check
With Manufacturer's Scan Tool
Engine Speed (RPM) Sensor -G28-, Checking
The engine speed (RPM) sensor -G28- detects engine speed and reference marks. Without an engine speed signal, the engine will not start. If the
engine speed signal fails while the engine is running, the engine will stop immediately.
Special tools and equipment
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V.A.G1551 scan tool (or VAG1552 mobile scan tool) with VAG1551/3 cable
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VAG1598/31 test box
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Multimeter Fluke 83 or equivalent
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VAG1594 connector test kit
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Wiring diagram
Test sequence
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Disconnect gray 3-pin harness connector -1- leading to the engine speed (RPM) sensor.
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Measure resistance of sensor between terminals 2 + 3 at connector to sensor.
Specification: 730 to 1000 Ohms
NOTE: Resistance value is valid at approx. 20°C. At higher temperatures, resistance value increases.
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Check sensor for shorts between terminals 1 + 2 and 1 + 3.
Specification: Infinity Ohms