Editing Lambda sensor (section)

==Sensor Testing==
*Disconnect the sensor from the ECU at the square, black plastic connector, so that the sensor's voltage may be measured in isolation.
*Attach an electronic voltmeter or oscilloscope (adjusted to a 1.0 volt range) across the black and grey wires attached to the lambda sensor. This can be done in a number of ways; paring back the insulation from the wires, attaching sprung probes directly to the pins in the connector, pushing pins or IDC splicing blocks through the insulation on the wires, etc. '''DO NOT''' use a moving coil meter to test the sensor, as the meter's low internal resistance will almost certainly damage it.
*Start the engine and allow it to warm up for several minutes. As the heater wire has been disconnected from the [[ECU]], it will take longer than normal for it to reach its 300°C minimum operating temperature.
*Examine the voltage output from the sensor. It should be greater than 0.2 volts. No voltage, or a very tiny voltage - far below 0.2 volts, most likely indicates a faulty sensor.
*Rev the engine and examine the change in voltage at the sensor. There should be practically no time delay between the engine being revved and a change in voltage at the sensor. A long delay may also indicate a faulty sensor.