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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: 8 of 202
B1F1B-15:- Solar Radiation Sensor Circuit - Circuit short to battery or open;
ISO Code
B1F1B- 15
Customer Symptom
System operates but with reduced sensitivity to conditions
Fault Effects (On Vehicle)
Solar load cannot be evaluated and solar compensation will
not be possible
Lamp Status (If Any)
No solar load is considered
Fault Detection Condition
Solar Radiation Sensor - Circuit short to battery or open
Normal Operating Condition
With the sensor connected to the harness and with Ignition
ON, check the voltage between pin no 1 & 2 of the sensor.
The voltage range should be in between 4.057 to 1.334 V
Probable Trouble Area
1)
Sensor connector is not connected firmly
2)
Sensor signal short to Battery
3)
No continuity between FATC ECU to Sensor
Healing Condition
1) If the values seen on the diagnostics tool in read ECU
parameters is not getting updated then replace the sensor
2) If there is a continuity between the sensor signal and
battery line correct the wiring harness (wiring harness short
to battery).
Component Details:
Solar sensors sends the voltage to control unit according to the intensity of sunlight. Stronger the incident sunlight,
higher the voltage.
Preliminary Checks:
Switch On the IGN & perform the following check.
1)
Connect the Diagnostics tool & check the DTC fault code
2)
Read ECU parameter for solar
sensor Solar Load Status
. Drive the vehicle in sun & check the parameter is changing
or not.
3)
Cover the solar sensor and check if the parameter value is changing.