This harness is designed to allow tuning of the 1999-2001 Honda CRV with automatic transmission. The 99-01 CRV factory OBD2 ECU/PCM controls the engine and the auto transmission from one unit. This dual adapter harness will split these signals so that an OBD1 ECU can be used to run the engine while the factory PCM will handle the transmission functions. This will allow you to install any of our OBD1 AUTO ECU packages to control and tune the engine, while your factory 99-01 CRV ECU/PCM continues to control the automatic transmission.
With this harness installed, the OBD1 ECU will control the engine only. The check engine light (MIL) on the dash will illuminate if there are any trouble codes with the OBD1 ECU. You will jump the service check connector to flash codes on the light on the dash, or use the tuning system (if present) to datalog and read these codes.
With this harness installed, the factory OBD2 ECU/PCM will control the automatic transmission. The check engine light on the dash will NOT illuminate for any codes on the factory ECU/PCM. If you need to read codes from the factory OBD2 ECU/PCM, you will use an OBD2 scan tool to read through the factory OBD2 diagnostic port. The factory OBD2 ECU/PCM will always have some codes present. This is because several of the signals that would normally go to the ECU and now being redirected to the OBD1 ECU instead. This is normal, and will not affect funcitonality.
- 99-01 Honda CRV with automatic transmission. Overdrive is functional and works properly on this application.
- Does NOT fit 97 CRV - 97 CRV support to come in the near future.
What ECU do I use?
This harness is designed to use any of our three OBD1 AUTO ECU packages:
We highly recommend that you select one of these ECU packages that your local tuning/dyno shop is familiar with. You don't want to select an ECU that your tuner is not able/willing to tune for you!
What Transmission control unit do I use?
How difficult is the installation?
Installation is fairly simple. Unplug your factory CRV PCM and plug this harness into your factory ECU/PCM plugs. Plug in the three new OBD1 ECU connectors to your new OBD1 ECU. Plug the four remaining OBD2 ECU plugs from the new harness into your factory ECU/PCM.
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