Oxygen Sensor and Oxygen Sensor Control In Center Catalytic Converter, Checking
Oxygen Sensor And Oxygen Sensor Control In Center Catalytic Converter, Checking (Vehicles With Engine Code BKF, BNU)
NOTE:
- Vehicle must be raised before oxygen sensor connector is accessible.
- When servicing terminals 3 and 4 in harness connector of Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram
Test requirements
- The respective fuses of Oxygen Sensor (O2S (in Center Three Way Catalytic Converter (TWC), Bank 1 -G465- must be OK.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers such as: lights and rear window defroster must be switched off.
- Parking brake must be engaged or else day time driving lights will be switched on.
- If vehicle is equipped with an A/C system, it must be switched off.
- For vehicles with automatic transmission, selector lever must be in -P-.
- Ground (GND) connections between engine and chassis must be OK.
- Exhaust system must be properly sealed between catalytic converter and cylinder head.
- Coolant temperature must be at least 80 degrees C. Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.
- Oxygen sensor heater for oxygen sensor in center catalytic converter must be OK, check.
Function test
- Select the following output of oxygen sensor signals and check whether the specified values are being reached. Diagnostic mode 5: Check output of oxygen sensor signals.
- End diagnosis and switch ignition off.
If specified values are not obtained:
- Check oxygen sensor wires to control module according to wiring diagram.
Checking oxygen sensor wires to control module
- Remove protective cover (arrows) and disconnect 4-pin harness connector to Oxygen Sensor (O2S) in Center Three Way Catalytic Converter (TWC), Bank 1 -G465-
- Connect test box to control module wiring harness. connect test box for wiring test.
- Check wires between test box and 4-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 3 + socket 68
Terminal 4 + socket 69
Wire resistance: max. 1.5 Ohms
- Check wires for short circuit to B+ and to Ground (GND).
Specified value: Infinite Ohms
- Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code.
If no malfunctions are found in wires:
- Replace Oxygen Sensor (O2S) in Center Three Way Catalytic Converter (TWC), Bank 1 -G465-.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code.