NEXON BSVI MCE - SERVICE MANUAL

1.2L REVOTRON ENGINE 165 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 2. DOWNSTREAM SENSOR PINOUT DETAILS PIN DESCRIPTION 1 Heater (+) 2 Heater Ground (-) 3 Sensor Ground (-) 4 Sensor Signal (+) COMPONENT SPECIFICATION The lambda sensor is mounted on the closed couple catcon. The lambda sensor has a four pin connector with a special ceramic body and gas permeable platinum electrodes on the surface. When the ceramic body is exposed to temperature 350 °C, oxygen in the air diffuses into ceramic body. Depending on the porosity electrodes which are exposed to gas having varied level of oxygen. The lambda sensor provides air/fuel ratio signal in mili volts to ECU as a function of varying air/fuel ratio. At 350 °C, Lambda = 0.97 - 800 mV ± 55 mV(Rich mixture) Lambda = 1.1 - 50 mV ± 30 mV (Lean mixture) SENSOR STANDALONE DIAGNOSIS Use TATA diagnosis tool to check for : Signal voltage - > than 0.5V or < than 0.4V Switching frequency - > than 0.2 Hz Use multi-meter to check the heater function by measuring the heater resistance. Heater resistance at room temperature – 90 ohms Supply voltage – 12V DC Check the signal voltage (Between pin number 2 and 3) Signal Voltage - 0.68 ± 0.25V DC- at idle position Signal Voltage - 04.25 ± 0.45V DC – at WOT position