Technoton DUT-E AF - Diagnostics and Troubleshooting; DUT-E with Analog Output

Diagnostics and troubleshooting / DUT-E with analog output
DUT-E fuel level sensors. Operation manual. Version 8.1
© Technoton, 2020 93
6 Diagnostics and troubleshooting
In case of any malfunction first of all examine condition of Vehicle power supply system and
power supply pins condition of the DUT-E connector.
WARNING:
1) Severe contact corrosion of chassis ground connection switch or its malfunction can
seriously affect DUT-E output signal.
2) DUT-E readings will be invalid if the measuring tubes are closed by conducting mud
or water.
6.1 DUT-E with analog output
Normal operation of analog DUT-E sensors can be verified with a multimeter by measuring
their output voltage (for DUT-E AF/A5/A10) or current (for DUT-E I) and comparing the
measurement results with the data of table 20.
Table 20 — Analog DUT-E malfunctions
Output signal value
Malfunction reason
Solution
Voltage:
from 1 to 9 V (for DUT-E AF)
from 0.4 to 5.0 V (for DUT-E A5);
from 0.4 to 10.0 V (for DUT-E A10)
Current:
2…22 mA (for DUT-E I)
No malfunctions, normal
operation
Check tracking device
operation
Voltage:
from 9.5 to 10 V (for DUT-E AF)
over 5 V (for DUT-E A5);
over 10 V (for DUT-E A10)
Current:
Over 22 mA (for DUT-E I)
Short circuit of the
measuring probe tubes
due to metal shavings
and burrs, conductive
mud or water at the
bottom of the fuel tank
Eliminate short circuit,
wash the tubes of the
sensor, clean the fuel tank
Voltage:
from 0.5 V and less (for DUT-E AF)
less than 0.4 V (for DUT-E A5 and
DUT-E A10)
Current:
less than 2 mA (for DUT-E I)
Sensor is not calibrated*
Calibrate the sensor*
Sensor PCB failure
Contact the closest
service center
* Only for DUT-E AF
Diagnostics of DUT-E AF can be carried out with service adapter the same way as for other
DUT-E modifications having digital output (see 6.3).