P29 OBD1 ECU Technical Reference
Technical reference for the P29 OBD1 ECU, commonly found in JDM Honda Domani and Civic 25th Anniversary models equipped with the DOHC ZC engine.
The P29 is an OBD1 engine control unit (ECU) utilized primarily in Japanese Domestic Market (JDM) Honda Domani and Civic 25th Anniversary models. It is specifically calibrated for the DOHC ZC engine.
Overview
The P29 ECU is a standard OBD1-spec unit. It shares the same physical architecture as other common OBD1 ECUs (such as the P30 or P06) but features unique fuel and ignition maps tailored for the DOHC ZC powerplant.
Note
While the P29 is physically compatible with other OBD1 Honda chassis, ensure the engine harness and sensor configuration match the DOHC ZC requirements before installation.
Technical Specifications
| Feature | Specification |
|---|---|
| OBD Standard | OBD1 |
| Market | JDM (Japanese Domestic Market) |
| Engine Application | DOHC ZC |
| Chassis Application | Domani / Civic 25th Anniversary |
Diagnostics
If you are troubleshooting sensor inputs or engine management issues related to this ECU, utilize the standard OBD1 diagnostic protocol.
Wiring and Pinouts
The P29 follows the standard OBD1 ECU pinout configuration. For specific sensor wiring requirements, refer to the standard OBD1 wiring diagrams.
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Important
Always verify your specific harness pinout against the ECU connector labels before applying power, as JDM-to-USDM harness conversions may require repinning of the VTEC or EGR circuits depending on the specific sub-model.