It is strongly recommended that you have this professionally installed as this is more difficult to install than an s200 and if the ECU has been previously socketed you run an even higher risk of damaging the ECU (lifting tracks and or burning them).
Socketing the s300 is very similar to the s100/s200. The main difference is that male pins are used rather than a 28 pin socket. The male pins are supplied with the s300, but for reference the digikey part number is WM6536-ND
Excessive heat, repeated soldering or physical force to remove ICs will lift tracks - so be careful when desoldering components not to damage the ECU.
US / Rectangular ECU Socketing
| 1. | Remove the ECU circuit board from the ECU case. |
| 2. | If there is no IC in IC4, solder the 20 pin 74373 latch IC into IC4. |
| 3. | If there is a socket in IC3, desolder and remove the socket. |
| 4. | Solder two strips of 14 male pins into IC3. |
| 5. | If there is a connector in CN2, desolder and remove the connector. |
| 6. | Solder 4 male pins into CN2 (pins 1-4) |
| 7. | Install the supplied jumper into J1 |
| 8. | If there is no resistor in R54 (right next to J1), skip this step, otherwise install the supplied resistor into R54. |
| 9. | Cut and/or remove J12. |
| 10. | To convert the ECU from automatic to manual, remove RP17 and place a jumper across RP18. |
| 11. | Replace the power supply capacitor at C14. |
| 12 | Install the ECU circuit board into the ECU case. Using the s300 USB connector as a template, mark the ECU around the USB slot. Cut the slot using a hacksaw or milling machine. |
JDM / Square ECU Socketing
| 1. | Remove the ECU circuit board from the ECU case. |
| 2. | If there is no IC in IC4, solder the 20 pin 74373 latch IC into IC4. |
| 3. | If there is a socket in IC3, desolder and remove the socket. |
| 4. | Solder two stipes of 14 male pins into IC3. |
| 5. | If there is a connector in CN2, desolder and remove the connector. |
| 6. | Solder 4 male pins into CN2 (pins 1-4) |
| 7. | Remove J4 (surface mount 0 ohm resistor) and transfer to J1 (located on the back of the circuit board). |
| 8. | Cut the center rib from the ECU case. |
| 9. | To convert the ECU from automatic to manual, replace the 2.4k resistor in RP18 with a 1.2k resistor. |
| 10. | Replace the power supply capacitor at C27. |
| 11. | Install the ECU circuit board into the ECU case. Using the s300 USB connector as a template, mark the ECU around the USB slot. Cut the slot using a hacksaw or milling machine. |
Stock case
Case after cutting
Make sure that when the knock board is placed back in the ECU that the ribbon cable is bent out of the way so that it is not crimped or broken.