4120 / 4910
Q5/X451 FATC
DTC Troubleshooting Data
Version: 1.0
Date: 16-Oct-2018
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.
Author: ERC
Page: 60 of 202
B1F1F-15:- Air Temperature Feedback Signal - Circuit Short to Battery or Open;
ISO Code
B1F1F – 15
Customer Symptom
System is less responsive to user control and environmental
conditions
Fault Effects (On Vehicle)
1)
If Motor learning is in process, end stops will not be
learnt properly
2)
Motor will not be positioned accurately
3)
Cooling and Heating will not be accurate
Lamp Status (If Any)
When Air Temperature feedback signal STS is detected,
motor will stay at current position. Thereafter if any new
user request comes/AUTO, motor will be driven on Time
basis.
Fault Detection Condition
Temperature Door Control Motor Feedback Line - Circuit
short to Battery or Open
Normal Operating Condition
With the Temperature feedback line connected to the
harness and with Ignition ON, checks the voltage between
blue connector pin no 10 & ground of the Connector. The
voltage range should be in between 1.3 to 3.89 V
Probable Trouble Area
1)
Motor connector is not connected firmly (open)
2)
Motor feedback line short to Battery
3)
Motor feedback line open
4)
Motor feedback ground line is open
Healing Condition
If there is a continuity between the Driver side temperature
door actuator Feedback line and Battery line correct the
wiring harness (wiring harness short to battery)
Component Details:
The actuator controls the position of the temperature blend door based on the voltage signal from the FATC module.
Potentiometer, inside the actuator, sends a feedback signal to the controller and controller cuts off the voltage signal
coming from the controller when the required door position is achieved.
Preliminary Checks:
Switch On the IGN & perform the following check.
1)
Connect the Diagnostics tool & check the DTC fault code
2)
Read ECU parameter value
Target Position of Temperature Door Flap
and
Temperature Door flap Position
(Internal Value)
for actual and target position of Actuator