F502 is a small Heavy Vehicle Code Reader which researched and developed by Fcar. It is with LCD true color display and can support heavy duty truck standard protocols. With high quality and good performance,this code reader can enable vehicle technicians to diagnose heavy duty trucks more easily and quickly.The  micro tool is widely used in various  maintenance companies, auto manufacturers, repair stations, petrol engine manufacturers and energy-based enterprises etc.


Support vehicles that compatible with standard protocol of heavy-duty trucks (J1939 and J1708).

Read DTC

Support ECU of vehicles like CUMMINSBoschDELPHI

Be connected to OBD16 via diesel 6PIN and diesel 9PIN

Diagnostic Protocol

J1587 Test        J1939 Test


Engine #1



Axle, Power Unit

Axle, Trailer

Brakes, Power Unit

Brakes, Trailer #1

Instrument Cluster

Trip Recorder


Screen size 

2.8 inch  320×240  LCD

Work voltage

8V ~ 32V

Work current

Typical value <100mA

Connection method

Standard 16-PIN OBD diagnostic connector

Working temperature

0~ 50

Storage environment temperature


Relative humidity


Product size(mm)


Weight of the main unit