Jetta GLX V6-2.8L (AFP) (2002)
If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code
must be generated again.
If no sensor malfunction is detected:
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Remove wiper arms and plenum chamber cover.
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Connect VAG1598/31 test box to Engine Control Module (ECM) wiring harness. Engine Control Module (ECM) is not connected by this action.
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Check wiring between test box and 3- pin harness connector for open circuit according to wiring diagram.
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Terminal -1- + socket 108
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Terminal -2- + socket 90
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Terminal -3- + socket 82
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Wire resistance: max. 1.5 ohms
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Additionally check wires for short to one another.
If no malfunction is found in the wiring:
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Remove sensor and check sensor wheel for secure fit, damage and run-out.
NOTE: There is a larger gap on the sensor wheel. This gap is the reference mark and does not mean that the sensor wheel is damaged.
If no malfunction is detected on sensor wheel:
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Replace Engine Control Module (ECM).