Small-case OBD1 ECUs, commonly found in JDM and European market vehicles, require specific considerations for socketing and chipping compared to standard North American large-case units.

Important

Ensure you have verified the PCB revision before beginning the socketing process, as trace layouts may vary between specific small-case board variants.

Required Components#

• 28-pin DIP socket (machined pins recommended)
• 29C256 or 27SF512 EEPROM chip
• 74HC373 latch (if not already present on the board)
• 1k ohm resistor (for J1 jumper)

Procedure#

For detailed step-by-step instructions on the physical modification process, refer to the Chipping JDMP300 guide.

Board Overview#

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Tip

Use a high-quality desoldering station to remove factory solder from the ROM location to prevent damage to the through-hole plating.