Category Archives: Truck Diagnostic tool

Launch X431 HD on Easydiag

We can use easydiag for Launch X431 HD heavy duty scanning. what we need is voltage converter. we need to convert 30v to 12v

this post from another site:-

A converter with 30 to 12 volts or a battery. I disassembled the cargo ECU. There a bunch of converters from 24 to 12 volts and the standard CAN and KL chips are powered by 12 volts. And for KL you need to select a capacitor (taking into account the passenger cars 4700 pF) for freight you need somewhere 6800- 8000 pF. Ie additional 2000-2500 pf (between the K-line and ground) is a simple KL-adapter, but that’s what the JV700 needs to look at. Concerning the “X431 HD Heavy Duty Box HD Adapter” (this is as an add-on) it can work on this program, but there must be another account for the PRO3 adapter. It’s easier to buy a dolphin or a car.

from someone’s post:-

Can. But you need a table then everything is equal. There is nothing complicated. A pulser, a suppressor of 14-15 volts. Optocoupler 4 pieces or 2 dual pair of resistors per 10k and a pair for 1k and two trunks approximately … It is possible and without optocouplers on 4 trunks and to protect 2 more suppresses

new drawing from post

you can put a mini voltmeter to a heap.


Fcar F502 Heavy Duty HD Truck Code Reader

Fcar F502 Heavy Duty HD Truck Code Reader

Language: English

Attention: This product do not sell to Australia and New zealand

Update Online on Official Website:

F502 Description:

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.

F502 code reader Features:

◆Support vehicles that compatible with standard protocol of heavy-duty trucks (J1939 and J1708).
◆Read DTC
◆Support ECU of vehicles like CUMMINS, Bosch, DELPHI
◆Be connected to OBD16 via diesel 6PIN and diesel 9PIN


What Diagnostic Protocol does this F502 code reader support?

◆J1587 Test        ◆J1939 Test

Detailed functions:


◆Engine #1 ◆Turbocharger ◆Transmission ◆Axle, Power Unit
◆Axle, Trailer ◆Brakes, Power Unit ◆Brakes, Trailer #1 ◆Instrument Cluster
◆Trip Recorder …………



1、OK diagnosis normal indicator light: The indicator light is on in communication diagnosis.
2、OK diagnosis failure indicator light: The indicator light is on when there is a failure of communication diagnosis;
3、Voltage indicator light: The indicator light is on when the machine is connected to OBDⅡ diagnostic sockets.
4、Diagnosis communication line, which should be connected to OBDⅡ diagnostic sockets on the vehicle;
5、Up and down buttons
6、Enter: The button for confirmation;
7、USB data line interface: Backup interface for data connecting;
8、Exit: The button for cancellation and back.
fcar-f502-heavy-vehicle-code-reader-vj-17 fcar-f502-heavy-vehicle-code-reader-vj-16 fcar-f502-heavy-vehicle-code-reader-vj-15 fcar-f502-heavy-vehicle-code-reader-vj-14 fcar-f502-heavy-vehicle-code-reader-vj-13 fcar-f502-heavy-vehicle-code-reader-vj-12