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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: 92 of 202
B1F3D-54:- Air Distribution Motor Drive Line– Missing calibration;
ISO Code
B1F3D- 54
Customer Symptom
No air distribution (mode) control (manual or automatic)
Fault Effects (On Vehicle)
The motor is blocked and its motion toward either end is
not possible
Lamp Status (If Any)
1. On First power up if calibration fails then It has to update
the default values from NVM.
2. After first successful calibration, If Calibration fails
Subsequently then Controller should load last saved
calibration values from NVM.
3. Controller will retry Calibration process in Next ignition
cycle untill it gets successful.
Fault Detection Condition
Mode Door Control Motor Calibration Fault
Normal Operating Condition
With the Mode motor drive line connected to the harness
and with Ignition ON, check the voltage between blue
connector pin no 5 & ground or 21 & ground of the
Connector. The voltage range should be in between 0 to 14
V
Probable Trouble Area
Motor learning is not accomplished because of
1)
Shorting of Motor drive to battery or ground
2)
Motor is stuck while calibrating
3)
System over/under voltage during calibration
4)
Motor feedback fault short to battery or ground
Healing Condition
Check the mechanical mountings and fitment of camshaft
placed on the actuators
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)
If the fault code exists, refer the corrective actions