Swapping engines or upgrading your Honda? Understanding ECU compatibility is crucial, especially when considering older OBD1 ECUs like the P28 with newer OBD2 systems. If you’re facing ECU dilemmas, particularly with a P2E (non-VTEC OBD2) and planning to use a D15B engine (likely intended for an OBD1 VTEC ECU), you’re in the right place.
The stock ECU for a D15B engine is often a P08, an OBD1 VTEC ECU. However, if you’re starting with a P2E OBD2 ECU and want to run a D15B, you’ll likely need to transition to an OBD1 system. For a straightforward, non-performance-oriented setup, a P08 OBD1 ECU could suffice. However, for enthusiasts looking at future modifications and tuning, the P28 Ecu Obd2 conversion becomes a highly recommended and versatile option.
Why the P28? The P28 is a popular OBD1 ECU known for its tuning capabilities and VTEC compatibility, making it a significant upgrade path. To use a P28 with an OBD2 vehicle, you’ll need an OBD2 to OBD1 conversion harness. This harness bridges the wiring differences between the older OBD1 ECU and the newer OBD2 car.
Before proceeding, identify your current OBD2 system. Honda OBD2 systems are generally categorized into OBD2A and OBD2B. Visually, you can distinguish between them by examining your ECU connectors.
To determine your OBD2 type, unplug your ECU and look at the connector plugs. OBD2A ECUs typically have three plugs clustered together on the left side. OBD2B ECUs often have a noticeable space between the plugs. Your P2E ECU will be either OBD2A or OBD2B, and this identification is crucial for selecting the correct OBD2 to OBD1 conversion harness for your P28 ECU OBD2 setup.
For example, if your original ECU is a P2P (OBD2B, often found in Y8/Y8 VTEC engines), and you’re installing a P28, you’ll require an OBD2B to OBD1 conversion harness. These harnesses are also sometimes referred to as jumper harnesses.
For further research and broader understanding of Honda D series engines and ECU options, resources like Wikipedia’s Honda D engine page (http://en.wikipedia.org/wiki/Honda_D_engine) and Hondata (hondata.com) can provide valuable insights.
In summary, when considering a P28 ECU OBD2 conversion for engines like the D15B in an OBD2 Honda, remember you’ll likely need an OBD1 ECU like the P28 and the appropriate OBD2 to OBD1 conversion harness. Identifying your OBD2A or OBD2B system is the first step to ensuring a successful and compatible ECU upgrade.
