Aftermarket / Chipped ECU

Aftermarket ECU

Brand	Compatible	Remarks
Spoon	✔	P73-0030-Z1, etc.
J's Racing	✔	P73
Feel's	✔	P73
Apex'i Power FC	✘	proprietary communication protocol
Hondata	✘	all versions, proprietary communication protocol
AEM	?	probably not compatible, proprietary communication protocol

Chipped Honda ECU

ROM Editor	Compatible	Remarks
Crome	✔	- classic version only - connected jumpers J4/J12 - no datalogger plugin
Ectune	✘	proprietary communication protocol
Neptune	✘	proprietary communication protocol

In case of chipped ECUs (P28, P30, P06, P75 etc.), the compatibility with Hondash depends on the combination of used ROM editors, installed board jumpers and correctly wired conversion harnesses (if applicable). Check all following points:

JUMPERS

• jumper J12 or J4 must be connected (usually bridged with a zero ohm resistor), if it was cut or disconnected, reconnect it with a wire
  • P28, P30 (non-JDM rectangular chips): J12 jumper
    
    
    

    J12 reconnected with a wire

    
    

    J12 factory stock zero ohm resistor
  • P30 (JDM square chips): J4 jumper
    
    

    J4 reconnected with a wire
• jumper J1 must be connected in order to use an external modified map (ROM) stored on a EEPROM chip.
  However if the other board jumpers (J12/J4) are connected as described above and you're still not able to get Hondash to communicate (due to used incompatible Rom editor) and you want to restore the compatibility with Hondash at any cost, just cut or remove this jumper J1. The main processor will fallback to use the internal stock map (ROM) instead of the external one stored on the EEPROM chip. Some users also install a switch instead of J1 jumper to switch between internal(stock) and external(modified) maps on the fly.
  Please be advised, if your engine is heavily modified (high lift cams, turbo, etc.) it's not recommended to run it on a stock map outside of low engine load conditions (idle, part throttle), take actions at your own risk.
  

  J1 jumper

ROM Editors

• CROME

  • must use classic version only (gold version not compatible)
  • datalogger plugin (Plugins » Enhancements » Quick Datalogger +RTP) must NOT be added to the map (ROM) before exporting the map and flashing it into the chip

• ECTUNE, NEPTUNE

  • both use incompatible proprietary communication protocol
  • cutting the J1 jumper is the only solution currently

OBD2(A/B) to OBD1 conversion harnesses

• make sure that the communication 5 V wire in the DLC diagnostic connector is correctly connected to a ECU pin (described as "K-line" or "TXD+RXD") by tracing it manually using multimeter's continuity test
• there is a couple of pins that outputs 5 volts, tracing the wire physically and making sure it's the correct one is mandatory, because it can read 5 volts even if it's connected to a wrong pin
  

  

  OBD1 ECU pin-out