Passat Sedan 4Motion W8-4.0L (BDP) (2002)
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Disconnect 3-pin connector from Engine Speed (RPM) Sensor -G28-.
Checking voltage supply and wiring to control module
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Connect multimeter between terminal 1 (B+) and 3 (Ground -GND-) for voltage measurement.
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Switch ignition on.
Specified value: at least 4.5 V
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Switch ignition off.
If there is no voltage:
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Connect test box to control module wiring harness, connect test box for wiring test. See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring Test
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Check wires between test box and 3-pin connector for open circuit according to wiring diagram.
Terminal 1 + socket 98
Terminal 2 + socket 82
Terminal 3 + socket 90
Wire resistance: max. 1.5 Ohms
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Also check wires for short circuit to each other.
Specified value: Infinity Ohms
If no malfunctions are found in the wires and there was voltage between terminals 1 + 3:
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Remove sensor and check sensor wheel for secure fit, damage, and run-out.
NOTE: There is a larger-sized gap on the sensor wheel. This gap is the reference mark and does not mean that the sensor wheel is damaged.