ZEST BOLT Service Manual

Revotron 1.2T 147 Connector View : 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 0 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 0 C, Lambda = 0.97 - 800 mV ± 55 mV(Rich mixture) Lambda = 1.1 - 50 mV ± 30 mV (Lean mixture) Sensor Stand alone Diagnosis : Connector details Terminal 1 :- 12 V Supply Terminal 2 :- ECU pin number M1E2 (Heater) Terminal 3 :- ECU pin number M2B3 (-ve) Terminal 4 :- ECU pin number M2A3 (+ve) Use TATA diagnosis tool to check for : Signal voltage - > than 0.5V or < than 0.4V Switching frequency - > than 0.2 Hz Use multimeter to check the heater function by measuring the heater resistance. Heater resistance at room temperature – 90 ohms Supply voltage - 5V 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