Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 320 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent P0037 -1A- HO2S Heater Control Circuit Low Bank 1 Sensor 2 Heated Oxygen sensors (HO2S) are inputs used by the PCM (Powertrain Control Module) to determine oxygen content in the exhaust system. Bank 1, sensor 2 refers to the second sensor back on bank 1. The PCM uses the information gained from the Bank 1,2 HO2S mainly to monitor the efficiency of the catalytic converter. Integral to this sensor is a heater element The PCM controls this heater to warm up the sensor to operating temperature. This allows the engine to enter closed loop faster and reduces emissions on cold startup. The PCM continuously monitors the heater circuits for abnormal voltages or in some cases, even amperages. Depending on the make of vehicle, the Oxygen sensor heater is controlled one of two ways. One way is that the PCM directly controls the voltage feed to the heater either directly or via a HO2S relay and a ground is supplied from the vehicle's common ground. Overview: Code Cause Effect on Vehicle Fault Code: P0037-1A 1. Bank 1, sensor #2 oxygen sensor heater element has failed 2. Physical damage to heated oxygen sensor has occurred 3. Control circuit (or voltage feed, depending on system) is shorted to ground 4. PCM Oxygen sensor heater driver has failed Most likely you'll not notice any symptoms other than the MIL Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check for any open circuit inside oxygen sensor Continuity Step 2 Check for corrosion at exhaust system Functionality Step 3 Check for Wiring/connectors broken/frayed leading to sensor and/or relay Physical check Step 4 Check oxygen sensor heater circuit wiring Functionality Step 5 Check ECU Functionality
RkJQdWJsaXNoZXIy MTIwNTUz