Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Remove protective cover -arrows- and separate 6-pin connector (black) -1- HO2S -G39-.
Checking voltage supply
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Connect multimeter using auxiliary cables from VAG 1594 to measure voltage at contacts 3 and 4 (connector to engine control module).
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Start engine and run at idle speed.
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Measure voltage supply and observe the display group 41, display zone 2.
Display: Htg.bC.ON:
Specification: 11.0 - 14.5 V
Display: Htg bC.ON/Htg.bC.OFF (alternating):
Specification: Between 0.0 - 12.0 V fluctuating
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Switch off ignition.
If no voltage is present:
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Remove inner plenum chamber cover, left:
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Connect test box VAG 1598/31 to control module wiring harness. The engine control module is not connected by this action.
