Golf GL L4-2.0L (AVH) (2002)
If specified values are not obtained:
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Replace engine speed (RPM) sensor -G28-.
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Check DTC memory, repair any malfunctions and then erase DTC memory.
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Clearing Diagnostic Trouble Codes
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
If no DTC is found on sensor:
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Remove wiper arms and wind cowl
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Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
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Check wires between test box and 3- pin connector for open circuits according to wiring diagram.
Terminal 1 and test box socket 108
Terminal 2 and test box socket 90
Terminal 3 and test box socket 82
Wire resistance: max: 1.5 Ohms
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Also check wires for short circuit to each other.
Specification: Infinity Ohms
If wiring is OK:
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Remove sensor and check sensor wheel for secure fit and damage.
NOTE: There is a larger-sized gap on the sensor wheel. This gap is a reference mark, not damage.
If nothing seems to be wrong with the sensor wheel:
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Replace Engine Control Module (ECM).