wilkorangerover Posted November 7, 2007 Share Posted November 7, 2007 i have just ordered a 4 wire lamba sensor, is the wiring easy to suss?? Quote Link to comment Share on other sites More sharing options...
Digsy Posted November 7, 2007 Share Posted November 7, 2007 If you know the pin-outs for the sensor you have bought, yes. Someone on here should be able to stump up the colours in the Supra loom to match, You'll have a heater live and a heater ground and a signal live and a signal ground. Quote Link to comment Share on other sites More sharing options...
Nic Posted November 8, 2007 Share Posted November 8, 2007 Is this to replace the standard O2 sensor? The stock NA O2 sensor only has 2 wires. Quote Link to comment Share on other sites More sharing options...
wilkorangerover Posted November 8, 2007 Author Share Posted November 8, 2007 does the flange holder seperate from the sensor on the genuine one?? as the universal one doesent come with a flange also thses are the wires on it Four Wire Universal Sensor Wire Colour Connection Black Signal Grey Earth White Heater White Heater Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 8, 2007 Share Posted November 8, 2007 No, you need a 2 bolt flange adaptor. I keep these, and my O2 sensors come with wiring swap over instructions, didn't yours? Quote Link to comment Share on other sites More sharing options...
wilkorangerover Posted November 8, 2007 Author Share Posted November 8, 2007 sensor has arrived, with a flange ! bonus just need wiring steps .......... cheers! Four Wire Universal Sensor Wire Colour Connection Black Signal Grey Earth White Heater White Heater Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 8, 2007 Share Posted November 8, 2007 These instructions are intended as a guide only and are not a substitute for a workshop manual. The fitter must have a degree of mechanical competence. If you are in any doubt as to your ability to fit the part, do not undertake the job. Lambda Instructions Safety Warning, lambda sensors are fitted into the exhaust system and operate at very high temperatures. Allow the vehicle to cool fully before attempting to remove the old sensor. Take proper precautions to prevent injuries from burns etc. The old sensor will probably be very tight . Take proper precautions to prevent injuries when removing it. As with any work that involves working under a vehicle ensure that it is chocked and propped (correctly) before commencing. Removing the old sensor 1 Disconnect the battery 2 Disconnect the oxygen sensor electrical connector 3 Unclip lambda wire loom as necessary 4 Unscrew and remove the oxygen sensor, the sensor may be very tight. Use the correct lambda sensor socket to help prevent injuries Fitting the new sensor CAUTION, check for damage to the threads in the lambda sensor boss in the exhaust. If these threads are damaged then damage to the new sensor will occur when fitting. 1 Cut off the original sensor wires approximately 50mm closer to the lambda sensor than the new universal sensor. I.E. the wires of the old sensor without the plug on should be 50mm shorter than the wires on the new replacement sensor (see diagram). 2 Strip back 5mm of insulation from each of the connector wires 3 Slip a heat shrink tube over each of the connector wires 4 Using the crimp type connectors supplied, crimp the wires colour to colour 5 Slide a heat shrink tube over each of the exposed crimp connectors and shrink the tube with a heat source (a match/lighter will suffice but please take precautions to avoid fire risks (to weather seal the connections.)) Hint, an improvement can be made by staggering the connections, see following diagram Soldering the joints is also possible and recommended, ensure you use silver solder. CONNECTION MADE WITH BUTT CONNECTOR & SHRINK TUBE TYPICAL FOR 2, 3 & 4 WIRE SENSORS CAUTION the wire colours should match the original sensor. If they are different please see the diagrams over the page. We are not responsible for incorrect wire connections. Screw in the new sensor CAUTION; The oxygen sensor may have a protective sleeve fitted over the threaded area, remove this cap before fitting the sensor. The threads will be coated with an anti-seize compound to assist later removal. Do not remove this coating. Do not allow this coating to get onto the sensor tip or damage may occur. 6. Clean Lambda threads in exhaust. 7. Screw the sensor fully home until finger tight. Tighten to a maximum torque of 35lbs./ft or consult your service manual for vehicle specific data. CAUTION do not exceed 35lb/ft. Damage to the lambda sensor may occur if this torque is exceeded. 8. Reconnect the sensor’s electrical connector. 9. Re-secure the lambda sensor wiring loom as the original equip ment loom. 10. Reconnect the battery 11. Following the procedures outlined in your vehicle’s service manual to clear any fault codes that may have been set (you may need to use a fault code reader). Note failure to do this may cause the onboard computer to register a fault and stay in “limp home” mode which may damage the catalytic converter or other emission equipment. . 3 & 4 Wire Sensors Alternative Wire Colours; BLUE = Signal (Previously Black) WHITE = Earth (Previously Grey) BLACK x 2 = Heater (Previously White) NOTE: On some vehicles fitted with a four wire lambda sensor it may be necessary to make a small modification to the wiring loom on fitting the sensor. If when the sensor is fitted in accordance with the enclosed fitting instructions the sensor fails to operate the following modifications will need to be carried out. An additional parallel earth connection must be made to the grey wire. If you are unsure about this modification please contact your supplier. Trouble shooting If the sensor fails to operate; Check the connections, especially universal types. Lambda sensors operate at very low voltages a high resistance connection can cause a voltage output error. Check for air leaks into the exhaust system between the engine and lambda sensor. This is a commonly overlooked fault that can cause a lambda sensor miss-reading fault. Check the heater circuit supply voltage/return (if applicable). Check the pre-catalyst emissions and compare this to the lambda sensor output. Periodic Maintenance Lambda sensors should be replaced periodically following the vehicle manufacturer’s recommendations, normally every 35,000 - 40,000 miles, because the working surface loses efficiency over time due to chemical contamination caused by combustion gases.The sensors become progressively less sensitive, even in correct engine running conditions. They should be considered a consumable item like spark plugs and cambelts etc. Missing periodical replacement causes increased fuel consumption, poor engine performance, environmental pollution and fast deterioration of the catalytic converter (much more expensive). Lambda Sensor Deterioration As a general rule, all lambda sensors are very sensitive to lead, coking, unburnt hydrocarbon, oil vapour, silicon and coolant contamination. Note that: 1 Lack of regular engine maintenance can damage the lambda sensor. 2 Carbon coking and unburnt hydrocarbons (due to a rich mixture) damage the lambda sensor. 3 Lead contamination, due to poor quality petrol or erroneous use of leaded petrol, causes fast deterioration of the lambda sensor. 4 Silicon contamination due to bad green petrol also quickly deteriorates lambda sensors. 5 Coolant contamination, due to leakage of engine gaskets, causes fast deterioration of the lambda sensor. Quote Link to comment Share on other sites More sharing options...
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