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{Osprey CCM}
DTC Troubleshooting Data
Version: 2.0
Date: 28-Jul-17
Author: ERC
Page: 76 of 244
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TATA MOTORS Ltd.
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B1F23-11:- Evaporator Temperature Sensor Signal - Circuit Short to Ground;
:
ISO Code
B1F23- 11
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 Display
Fault Detection Condition
Evaporator Temperature Sensor Circuit - Circuit Short to
Ground
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
The sensor wiring is shorted to ground
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
Evaporator Temperature Sensor Signal Input
sensor ECU from the diagnostic tool