HARRIER BOOK 2

Q501 4 Cylinder MT Application

DTC Troubleshooting Data

Version: 0.1

Date: 21-Sep-2018

Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta

Checked By: Yogesh Jadhav

Approved By: Satish Kumar P

Page: 97 of 1052

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.

U0164-31: Lost Communication With HVAC Control Module: CCM Climate control Module Node Tout Faulty

Overview:

DTC Description (User Friendly)

Lost Communication With HVAC Control Module: CCM

Climate control Module Node Tout Faulty

ECU Pin Number

K068 – A/C abnormal pressure input.

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)

CEL OFF and MIL Off.

Fault Detection Condition (Root cause)

This fault takes place if the HVAC / FATC module is not

connected on CAN network. Loss of communication

between HVAC Module and EMS ECU.

Any of the selected frames from CCM node is timed out.

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:

1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above

Table. If yes, go ahead with next steps. If not, check for other DTC’s presence.

2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with

respect to earlier issue closure.

3. Check for Damage in EMS ECU connector / FATC ECU Connector.

4. Check for any back out of pins at EMS ECU connector / FATC ECU Connector.

5. Check for any damage of pins at EMS ECU connector / FATC ECU Connector.

Trouble Shooting: