Introduction for 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.

Descriptions for TMS374 ECU Decoder

TMS374 ECU DECODER
A handy tool to have that will decode an all the above ecu's to a new state without the need of a laptop!

Introduction:

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
 

Manual:

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 SIEMENS
Daewoo Matiz 800cc
 
HYUNDAI SIEMENS
Hyundai Coupe 1600cc 16V
Hyundai Coupe 2000cc 16V
 
KIA SIEMENS
Kia Rio 1300 16V
Kia Rio 1500 16V
 
MAGNETI MARELLI
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
 
 
TMS-374
1APSAGEMSIEMENS
 

 
Procedure:

Simply power the ECU and device using a suitable 12V power supply. Connect the GND cable to a good ground source on the ECU and then the data line to the Reset Pin on the flash 27c512 or 28F512 as shown in the diagram.
Start the device and wait for it to finish its cycle (the led will turn off). At this point the ECU has been decoded and put into a new state. The Immo line will need to be disconnected before the ECU is re-fitted back to the car.