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: 52 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. P0032-12: HO2S Heater Control Circuit High (Bank 1 sesnor 1) – Circuit Short to Battery Overview: ISO Code P0032-12 Customer Symptom 1. No effect on engine starting. 2. Lambda control will be deactivated. Fault Effects (On Vehicle) 1. Vehicle running in Open loop initially for a longer time. 2. No effect on starting and driveability Lamp Status (If Any) MIL ON after 3 drive cycles. Fault Detection Condition When the Engine is running and the Upstream oxygen Sensor heater control pin of EMS ecu is short Circuited to battery. Normal Operating Condition Upstream Oxygen Sensor provides plausible signal to EMS ECU. Probable Trouble Area Wiring Harness connections, Sensor 1.Heater Line shorted to battery for upstream sensor 2. Faulty Lambda sensor 3. Faulty ECU. Healing Condition Engine State 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: 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. 5) Check for Sensor poisoning / contamination.