Jetta GLX Wagon V6-2.8L (AFP) (2001)
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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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Connect multimeter to measure voltage between test box sockets -2- + -54-.
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Switch ignition on.
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Lift vehicle at left-front.
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Rotate front wheel and observe voltage display.
Specified value: between 0 and at least 4 Volts, fluctuating.
NOTE: If necessary, hold the right-front wheel to prevent it from turning.
If the display does not fluctuate:
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Check wiring to speedometer/speedometer sensor.
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Check DTC memory.
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Display readiness code.
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.
