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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: 64 of 202
B1F21-11:- Air Distribution Feedback Signal – Circuit Short to Ground;
ISO Code
B1F21- 11
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 STG is detected,
motor will stay at current position. Thereafter if any new
user request/AUTO comes, motor will be driven on Time
basis.
Fault Detection Condition
Mode Door Control Motor Feedback Line - Circuit short to
Ground
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 of the Connector. The voltage range
should be in between 0.2 to 4.7 V
Probable Trouble Area
Sensor signal short to ground
Healing Condition
If there is a continuity between the Mode distribution door
actuator Feedback line and Ground line correct the wiring
harness (wiring harness short to Ground)
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