Nexon EV Instrument Cluster DTC Troubleshooting Data Version: 1.1 Date: 13-July-2021 Author: Deepak Pujari Page: 7 of 108 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. B190B - 11:- Ambient Temperature Sensor Input Short To Ground Overview:- ISO Code B190B – 11 Customer Symptom N/A Fault Effects (On Vehicle) N/A Lamp Status (If Any) N/A Fault Detection Condition IC shall display OAT as ‘--‘ deg.C. Normal Operating Condition IC shall display OAT value & Operating range is b/w -40 to 85 Deg. Probable Trouble Area Related wiring Harness, connector or terminals damaged IPC connector wired wrong, Harness wire shorted, Sensor connector wired wrong, Sensor damaged. Healing Condition IC shall recover from open/short condition after receiving valid values for 20s or Ignition On/Off. Preliminary Checks:- 1. Check Battery Voltage is normal in the range (9v - 16v) 2. Check OAT lines for Pinch/Cut. 3. Check ECU & Sensor pins for oxidation, bending & damage. 4. Check and ensure OAT Sensor is giving linear Resistance output w.r.to the Temperature change. 5. Check Sensor resistance on Pin no. 14 (OAT i/p) & 15 (OAT Gnd) of the wired connector, whether it is according to the design specifications (between 321 to 100.922k ohm). DTC’s confirmation:- After rectification, ensure the following points before handing over the system to the customer a) Battery voltage should be 9-16v. b) Ensure ECU connector is place correctly. c) In the absence of OAT sensor IC shall display ‘--‘ . d) Check and ensure OAT Sensor input & follows the same Deg. C value on display. e) Check also in vehicle driving condition & check the temperature change on display. Component Details:- OAT Sensor - This sensor gives direct resistive input to the Cluster w.r.t to the temperature changes in Outside environment. Refer below table for resistance Vs temperature mapping.
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