Q501 4 Cylinder MT Application DTC Troubleshooting Data Version: 0.1 Date: 21-Sep-2018 Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta Checked By: Yogesh Jadhav Approved By: Satish Kumar P Page: 612 of 1052 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. P014C-92: O2 sensor slow response – Rich to Lean Bank 1 sensor 1 – Lambda sensor upstream dynamic fault (rich to lean transitions) Overview: DTC Description (User Friendly) Lambda sensor upstream dynamic fault (rich to lean transitions) ECU Pin Number A046, A104, A105, A083, A084 Customer Symptom MIL ON1, CEL OFF. Low fuel efficiency Fault Effects (On Vehicle) Low fuel efficiency and Engine performance impacted. Lamp Status (If Any) MIL ON1. MIL will be off after 3 warm cycles (drive cycle with 22 deg of coolant temperature increase is a Warm up cycle). Fault Detection Condition (Root cause) Dynamics fault (Transition) of O2−signal dynamics (rich to lean transitions; sensor 1, bank 1) Normal Operating Condition Fault condition not present Probable Trouble Area O2 Sensor Wiring Harness connections between O2 sensor and EMS ECU. Defective Catalytic converter Leaks in Exhaust path Leaks in Intake air path Poor EGR performance Poor Fuel system performance EMS ECU Healing Condition Rectify the error Clear through diagnostic tool Ignition OFF & ON Component Details: O2 / oxygen sensors are constructed using a zirconium dioxide-sensing element, which is protected by a specially designed, vented, steel housing. Platinum electrodes are used to attach the sensing element to wire leads in the O2 sensor wiring harness, which is connected to the PCM. The PCM is supplied with an electrical signal according to the percentage of oxygen particles in the engine exhaust compared to the oxygen content of ambient air. Exhaust gases are pushed into the exhaust manifold(s) and down pipe(s) where they flow over/through the upstream O2 sensor. Exhaust flows through the O2 sensor vent holes (in the steel housing) and across the sensing element and ambient air is drawn through the wire lead cavities where it is trapped in a small chamber in the center of the sensor. The exhaust, forcing the oxygen ions to produce (energy) voltage, heats the trapped ambient air (in the chamber). Deviations between the concentration of oxygen molecules in ambient air (drawn into the center cavity of the O2 sensor) and the concentration of oxygen ions in the spent exhaust gases, cause the heated oxygen ions inside the O2 sensor to jump between platinum layers very rapidly and repetitiously. Fluctuations in voltage occur as the rushing oxygen ions jump between the layers of the platinum electrodes. These variations in voltage are identified by the PCM as changes in exhaust oxygen concentration, which indicate that the engine is either running lean (too little fuel), or rich (too much fuel). When more oxygen is present in the exhaust (lean condition), the voltage signal from the O2 sensor is low and is higher when less oxygen is present in the exhaust (rich condition). This data is used by the PCM primarily to calculate fuel delivery and ignition timing strategy but also to monitor catalytic converter efficiency.
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