TMS374 ECU DECODER

This Tool is a frequency sweeper with 5V square wave output (Duty cycle 50%, effective frequency range from over 10kHz (max 50kHz) to 50Hz) .This tool can be also considered as a MCU version of the software TMS-374 Decoder ECU. The only difference between the two tools is that the MCU version works without a PC.
A small MCU is used to generate the pulses instead of the PC RS232 Tx line. The TMS 374 software is in fact a simple frequency sweeper with an effective range from about 2000Hz to about 100Hz. The Tiny sweeper does exactly the same but much more better (bigger range).
After powering the device on - the LED should blink twice. Pressing the button will start the sweep procedure. LED ON - means there are pulses on the output. After reaching the lowest frequency the LED goes off and the mcu stops the generation.
Connection diagram:
+ :12v DC
- : GND
S :signal wire

• Power the sweeper and ECU
• Connect the GND line to any suitable GND on the ECU
• Connect the Data line to the Reset pin on the 27C512 or 28F512

TMS-374 Decoder ECU info
The sweeper should work with the following ECUs:

VAS 5054A, PSA LEXIA3, Renault Can Clip, Autocom CDP Prog, Gm Tech-2 Pro Kit, Ford vcm IDS