{Osprey CCM} DTC Troubleshooting Data Version: 2.0 Date: 28-Jul-17 Author: ERC Page: 73 of 244 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. B1F23-15:- Evaporator Temperature Sensor Signal - Circuit Short to Battery or Open;: ISO Code B1F23- 15 Customer Symptom No cooling Fault Effects (On Vehicle) Evaporator temperature cannot be evaluated, hence cooling cannot be achieved Lamp Status (If Any) Specific Warning Text[ERR] is displayed on Head Unit Fault Detection Condition Evaporator Temperature Sensor Circuit - Circuit Short to battery or open Normal Operating Condition Open Sensor connection and measure voltage between the terminals of the wiring connector (Signal and GND) to check if it measures 4-5V Probable Trouble Area 1)The sensor wiring is faulty or sensor is faulty (open) 2) The sensor wiring is shorted to battery Healing Condition IGN ON/OFF Component Details: Evaporator temperature sensor is used to measure the evaporator core temperature .The evaporator cools the refrigerant in the HVAC system .Since the evaporator core operates at temperatures very close to 0 DegC,it is important to have an accurate and robust thermistor to measure its temperature to prevent the core from freezing . A frozen core could result in costly damage to the evaporator core and diminished HVAC operation so that the cabin temperature can no longer be controlled Preliminary Checks: 1. Switch On Ignition. Check sensor and its connector located at center position of lower case of the HVAC unit. 2. Read Evaporator Temperature sensor ECU parameter Evaporator Temperature Sensor Signal Input from the diagnostic tool
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