Understanding your Honda’s engine control unit (ECU) and its compatibility with performance modifications is crucial. This guide focuses on identifying the correct COP (chip on board) for your Honda OBD2 ECU, specifically focusing on the differences between OBD2A and OBD2B ECUs commonly found in Honda Civic Type R models. This knowledge is particularly important when considering modifications like the Apexi Power FC.
Choosing the wrong ECU or conversion harness can lead to compatibility issues and prevent your modifications from working correctly. This guide will walk you through identifying your Honda’s ECU to ensure compatibility.
Identifying Your Honda OBD2 ECU
Honda ECUs are typically located in the passenger footwell. There are key visual differences between the various generations: OBD0, OBD1, OBD2A, and OBD2B.
- Top to Bottom: OBD2B (98 Sept – 00 Honda Civics), OBD2A (96-98 August Honda Civics and 95-2001 Integras), OBD1 (92-95 Hondas), OBD0 (88-91 Hondas).
Case Study: 1999 Honda Civic Type R (EK9)
Let’s examine a 1999 Honda Civic Type R (EK9) as a practical example.
First, remove the plastic cover in the passenger footwell securing the ECU. It’s held in place by three screws: two plastic and one metal.
Once removed, the ECU will be exposed.
The 1999 Honda Civic Type R uses an OBD2B ECU.
OBD2B to OBD2A Conversion for Apexi Power FC
Since the 1999 Civic Type R has an OBD2B ECU, installing an Apexi Power FC, which is often compatible with OBD2A, requires a conversion harness. This harness bridges the gap between the two ECU types, enabling compatibility.
Companies like Phearable.net offer these conversion harnesses.
Conclusion
Correctly identifying your Honda’s OBD2 ECU is vital for successful performance modifications. Understanding the distinctions between OBD2A and OBD2B, especially when considering aftermarket ECUs like the Apexi Power FC, will save you time and frustration. This guide provides a clear path to identifying your ECU and making informed decisions about modifications for your Honda.
