1.2L REVOTRON ENGINE 125 I. LAMBDA SENSOR COMPONENT DETAILS The oxygen sensor operates on the principle of galvanic oxygen concentration cell (Nernst cell) with solid electrolyte (Nernst's principle). The ceramic sensing element is a conductor of oxygen ions from a temperature of 350°C. A heater is integrated on the sensing element. It is placed into the exhaust manifold. The sensing element compares the residual oxygen content in the exhaust gas with the oxygen content in the reference atmosphere (air surrounding the sensing element). This gives an output voltage between 100mV (lean exhaust gas) to 800mV (rich exhaust gas), depending on whether the exhaust gas is lean or rich. COMPONENT LOCATION The lambda sensor is mounted at the input and output of the catcon as upstream and downstream lambda sensor. PRELIMINARY CHECKS 1. Loose/ Damaged Connections between Sensor and EMS ECU. 2. Check for back out of pins at both Sensor connector and ECU connector. 3. Check for damage of pins at both sensor connector and ECU connector. 4. Check the continuity from sensor connector pins to the ECU pins. 5. Check for Sensor poisoning / CONNECTOR DETAIL 1. UPSTREAM SENSOR PINOUT DETAILS PIN DESCRIPTION 1 Pumping Current 2 Virtual Ground 3 Heater (-) 4 Heater +V batt Trim Resistor Nernst Voltage
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