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‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector B and additionally to the engine control unit .
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‒ Connect voltage tester V.A.G 1527 B as follows:
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Test box V.A.G 1598 A Socket
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Measure to
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27
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Engine earth
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‒ Switch on ignition.
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‒ The LED must light dimly and become brighter on pressing the accelerator pedal.
If the LED does not light up and does not become brighter:
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‒ Check throttle valve potentiometer
=> Page 24-86
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‒ If the throttle valve potentiometer is OK, fit a new engine control unit => Page 24-12.
If the LED lights up and becomes brighter:
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‒ Pull connector off automatic gearbox control unit.
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‒ Check for open circuit and short to positive or earth in following wiring connections:
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Test box V.A.G 1598 A Socket
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Control unit for Automatic gearbox Contact
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27
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=> "Current Flow Diagrams, Electrical Fault Finding and Fitting Locations" binder
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‒ If wiring is OK, establish defect in automatic gearbox control unit.
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