Beetle L4-2.0L (AEG) (2000)
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Connect multimeter between terminals 1 and 2 on ECM harness connector.
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Start engine and let idle.
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Measure Voltage supply and note Display group 41, Display field 2
Heater before Three Way Catalyst ON:
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Specification: 11.0 to 14.5 Volts
Heater before Three Way Catalyst ON/Heater before catalyst OFF (alternating):
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Specification: Between 0.0 to 12.0 Volts fluctuating
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Switch OFF ignition.
If no Voltage present
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Connect VAG 1598/22 Test Box to Engine Control Module wiring harness.