Golf GL L4-2.0L (AEG) (2001)
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Check resistance for sensor heater at connector to oxygen sensor terminal 1 + 2. Specified value: 1,0 ... 5,0 Ohms (at room temperature)
If specified value is not obtained:
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Replace Heated Oxygen Sensor (HO2S) 1 Bank 1 -G39- before catalytic converter, item 9.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: Testing and Inspection/Scan Tool
Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase Diagnostic Data
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Generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If specified value is obtained:
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Check Ground (GND) activation of oxygen sensor heater.
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Connect test box to control module wiring harness, connect test box for wiring test. See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring Test
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Check wires between test box and 4-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 2 + socket 27
Wire resistance: max: 1.5 Ohms
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Also check wires for short circuit to B+ and Ground (GND). Specified value: Infinite Ohms
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Check wire between 4-pin connector terminal 1 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram. Wire resistance:
max: 1.5 Ohms
If no malfunctions are found in wires:
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Replace Motronic Engine Control Module (ECM) -J220-.
Test sequence (Vehicles with engine code AVH, AZG)