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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: 68 of 202
B1F21-15:- Air Distribution Feedback Signal – Circuit Short to battery or Open;
ISO Code
B1F21- 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
Lamp Status (If Any)
When Air distribution feedback signal STS is detected,
motor will stay at current position. Thereafter if any new
user request/AUTOcomes, motor will be driven on Time
basis.
Fault Detection Condition
Mode Door Control Motor Feedback Line - Circuit short to
Battery or open
Normal Operating Condition
) With the Mode feedback line connected to the harness
and with Ignition ON, check the voltage between blue
connector pin no 11 & ground. The voltage range should be
in between 0.2 to 4.7 V
Probable Trouble Area
1) Sensor connector is not connected firmly (open)
2) Sensor signal short to Battery
Healing Condition
If there is a continuity between the blower Feedback line
and Battery line correct the wiring harness (wiring harness
short to battery)
Component Details:
The Mode Door Actuator controls the direction of airflow. It selects which way air flows through the different ducts.
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 Mode Door Flap
and
Air Distribution Mode Door flap Position
(Internal Value)
for actual and target position of Actuator