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TMS374 ECU Decoder

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A handy tool to have that will decode an all the above ecu's to a new state without the need of a laptop!


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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



After powering the device on - the LED should blink twice. The sweeping process starts as power is supplied to the device. LED ON - means there are pulses on the output. After reaching the lowest frequency the LED goes off and the mcu stops the generation.


* Connect the GND line to any suitable GND on the ECU via the small grabber.

* Connect the Data line to the Reset pin on the EPROM via the small grabber.

* Power the ECU and then the sweeper, the sweeper will flash twice on power up.

* Press the button and the device will start sweeping, once the LED turns off your done.

* Cut the immo data line on the ECU before re-fitting back to car.


TMS-374 Decoder ECU info

The sweeper should work with the following ECUs:


Renault SIEMENS Fenix 3 and 5

Renault Megane 1400cc 8v

Renault Megane 1600cc 8v

Renault Megane 2000cc 8v

Renault Megane 2000cc 16V

Renault Megane Scenic 1400cc 8v

Renault Megane Scenic 1600cc 8v

Renault Megane Scenic 2000cc 8v

Renault Sefrane 2000cc 16V

Renault Laguna 2000cc 8v

Renault Laguna 2000cc 16v

Renault Espace 2000cc 8v


Renault SAGEM SAFIR 1 and 2

Renault Clio 1200cc 8V

Renault Clio 1400cc 8V

Renault Clio 1600cc 8V

Renault Clio 2000cc 16V Williams

Renault Laguna 1800cc 8V

Renault Laguna 2000cc 8V

Renault Laguna 1800cc 16V

Renault Laguna 2000cc 16V

Renault Twingo 1200cc 8V


NOTE: If reset pin is connected to ground then it must be lifted or the track cut before decoding. This can be re-attached after decoding the ecu. As a rule of thumb keep the power connected to the ECU for a futher five minutes after the decoder has completed the decoding process.


Sagem SL96 Psa

Peugeot 306 1400cc 8V

Peugeot 306 1600cc 16V

Peugeot 306 1800 16V

Peugeot Ranch 1400 8V

Citroen Berlingo 1400cc 8V

Citroen Xrara 1400cc 8V

Citroen Xrara 1800cc 16V



Daewoo Matiz 800cc



Hyundai Coupe 1600cc 16V

Hyundai Coupe 2000cc 16V



Kia Rio 1300 16V

Kia Rio 1500 16V



1AP20, 1AP40, 1AP41, 1AP43, 1AP80, 1AP81, 1AP83 1AP90,

Citroen Berlingo 1800cc 8V

Citroen Saxo 1400cc 8V

Citroen Saxo 1600cc 16V

Citroen Xara 1400cc 8V

Citroen Xara 1800cc 8V

Citroen Xara 2000cc 16V

Citroen ZX 1400cc 8V

Peugeot 106 1400cc 8V

Peugeot 106 1600cc 8V

Peugeot 106 1600cc 16V

Peugeot 206 1100cc 8V

Peugeot 206 1400cc 8V

Peugeot 306 1400cc 8V

Peugeot 306 1600cc 8V

Peugeot 306 1800cc 8V

Peugeot 405 1800cc 8V

Peugeot 406 1800cc 8V

Peugeot Partner 1800 8V

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Product Reviews

Name Rating Review
Giovanni (Posted on 2011-12-02)
Possibile spedizione in contrassegno indirizzo Caldarelli Gionanni Via Lazio N5 Castel Volturno Caserta CAP 81030 Grazie


Dear Sir

Hello, we could onlly send your product according to your address information on paypal.

Thanks and best regards.

William (Posted on 2011-11-17)
Yeah, exactly what i need for my car, nice product, thx.
Robert (Posted on 2011-11-16)
this is so great, it has beyond my expectation, strongly recommended.

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