Jetta SportWagen L4-2.0L Turbo (CCTA) (2009)
Engine Speed Sensor: Testing and Inspection
Diagnostic Procedures
Engine Speed Sensor, Checking
‹› Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Engine Speed (RPM) Sensor (G28).
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test requirements
‹› The Motronic Engine Control Module (ECM) (J623) fuses OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Function
The Engine Speed (RPM) Sensor (G28) detects RPM 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.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to --> [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
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Connect the scan tool.
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Start the engine and allow it to idle.
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Using the scan tool, check the engine speed:
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Switch ignition off.
If the specified value was Not obtained:
Checking internal resistance
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Disconnect the Engine Speed (RPM) Sensor (G28) electrical harness connector.
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Using a multimeter, check the Engine Speed (RPM) Sensor (G28) terminals 1 to 2 for resistance.