HARRIER BOOK 2

Q5/X451 FATC

DTC Troubleshooting Data

Version: 1.0

Date: 16-Oct-2018

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: 56 of 202

B1F1F-11:- Air Temperature Feedback Signal - Circuit Short To Ground;

ISO Code

B1F1F – 11

Customer Symptom

System is less responsive to user control and environmental conditions

Fault Effects (On Vehicle)

If Motor learning is in process, end stops will not be learnt properly

Motor will not be positioned accurately

Cooling and Heating will not be accurate

Lamp Status (If Any)

When Air Temperature 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

Temperature Door Control Motor Feedback Line - Circuit short to Ground

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 Ground

Healing Condition

If there is a continuity between the Driver side temperature door actuator

Feedback line and Ground line, correct the wiring harness (wiring harness short

to Ground)

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.

Connect the Diagnostics tool & check the DTC fault code

Read ECU parameter value

Target Position of Temperature Door Flap

and

Temperature Door flap Position

(Internal Value)

for actual and target position of Actuator