{Osprey CCM} DTC Troubleshooting Data Version: 2.0 Date: 28-Jul-17 Author: ERC Page: 6 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. B1F2B-12:- Air Conditioning Compressor Request – circuit short to battery; Overview: ISO Code B1F2B-12 Customer Symptom Over cooling Fault Effects (On Vehicle) AC request to EMS will always remain On for short to battery condition and draw battery current Lamp Status (If Any) NA Fault Detection Condition AC request drive line is short circuited to Battery Normal Operating Condition Voltage at pin 27 of green connector should be 0V. AC goes off when requested Probable Trouble Area HVAC connector wired wrong, switch connector wired wrong, harness wire shorted Healing Condition NA Component Details: Compressor - The compressor is the heart of an auto's air conditioning system, circulating the refrigerant that is vital to proper operation of AC. Preliminary Checks: Switch On the IGN & Engine, perform the following check. 1) Connect the Diagnostics tool & check the DTC fault code 2)Read ECU Parameter, Air Conditioning Compressor Request Output . Trouble Shooting:-
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