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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 647 of 654
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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.
U0164: Lost Communication with HVAC Control Module
Overview:
ISO Code
U0164
Customer Symptom
AC will not Turn ON / AC Compressor will not Engage
Fault Effects (On Vehicle)
AC will not Turn ON / AC Compressor will not Engage
Lamp Status (If Any)
-
Fault Detection Condition
This fault takes place if the HVAC / FATC module is not
connected on CAN network. Loss of communication
between HVAC Module and EMS ECU
Normal Operating Condition
Proper Can communication between FATC and EMS
ECU
Probable Trouble Area
CAN Connections between FATC and CAN network
Healing Condition
EMS receiving CAN signals from FATC
Component Details:
EMS ECU receives the AC request input from FATC controller through CAN signal.
Preliminary Checks:
x
Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If yes,
go ahead with next steps. If not, check for other DTC’s presence.
x
Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier
issue closure.