TIAGO TIGOR BSVI - SERVICE MANUAL - DTC 24-12-2021

TATA BSVI Gasoline Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.2 Date: 18-12-2019 Prepared By: Sunita Mandlik Checked By: Yeshwant Jadhav Approved By: Satish Kumar Document Part No: 2921 02 xxx xxxx Page: 260 of 1498 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. P0140-2F: O2 Sensor Circuit Signal Line Short to Heater Line(Bank 1 Sensor2)-Signal Erratic Overview: ISO Code P0140 – 2F Customer Symptom Drivability will get affected during idle and part Load conditions Fault Effects (On Vehicle) 1. No apprehensive feeling in idle. 2. No effect in drivability Lamp Status (If Any) MIL ON after 3 drive cycles Fault Detection Condition This fault gets logged if EMS ECU finds the downstream oxygen Sensor signal pin of EMS is short Circuited to its heater control pin. Normal Operating Condition Wiring Harness connections as per schematic for downstream oxygen Sensor. Probable Trouble Area Wiring Harness Connections / Sensor Healing Condition Engine running and 3 drive cycles Fault permanent deletion 1. Clear DTC Command form Scan tool 2. Stack Over Flow. 3. 40 warm up cycles. 4. ECU Flashing. 5. ECU Power-Fail Component Details: Lambda Sensor: 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. 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.