New Beetle L5-2.5L (BPR) (2007)
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) ( J220 ) 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 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 stall.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Powertrain Management/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.
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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
‹› Polarity of the Multimeter leads MUST be followed or the result will be in error leading to misdiagnosis.
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Disconnect the Engine Speed (RPM) Sensor (G28 ) electrical harness connector.
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Using a multimeter, connect the RED multimeter lead to Engine Speed (RPM) Sensor (G28) terminal 1 and the BLACK multimeter lead to
terminal 2 for resistance.