Beetle L4-2.0L (AEG) (2000)
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Start engine and measure the basic Voltage.
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Specification: 0.40 to 0.50 Volts
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Switch OFF ignition.
If specification not obtained
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Check Oxygen sensor wiring.
If specification obtained
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Replace Oxygen sensor G39.
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Display the Readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Displaying Readiness Code", See: Testing and
Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
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If DTC memory was erased or if the ECM was disconnected from Battery + , set the Readiness code. Refer to "Monitors, Trips and/or Drive Cycle
(Readiness Codes)/Setting Readiness Code", See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Oxygen sensor wiring, checking
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Connect VAG 1598/22 Test Box to ECM wiring harness.
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Check wiring for open circuit between Test Box and 4-pin harness connector to ECM using Wiring diagram.
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Terminal 3 + socket 25
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Terminal 4 + socket 26
Wire resistance: 1.5 Ohms maximum
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Check wiring at 4-pin connector for shorts to one another.
Terminal 4 + socket 25 specification: Infinity Ohms
If wiring OK:
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Replace Engine Control Module.