Rywire offers budget-friendly engine harnesses for various Honda and Acura models, including those using Obd2 Engines. These harnesses, designed for D-series, B-series, F-series, and H-series engines, are nearly identical to their mil-spec counterparts, differing primarily in the use of single black wiring and expandable loom. This guide will help you understand the critical aspects of these harnesses, particularly their compatibility with OBD2 engine applications.
Key Features of Rywire Engine Harnesses
Rywire harnesses are built with quality and ease of installation in mind. All connectors are new and professionally crimped using pneumatic heads for an OEM-style connection. Each wire is clearly labeled for straightforward installation. The harnesses are also rigorously tested for quality, ensuring pin-to-pin connectivity and resistance to prevent voltage fluctuations.
One notable feature is the separation of the engine harness from the chassis-specific sub-harness. This allows for easy swapping between different chassis by simply changing the sub-harness. This modular design saves you from purchasing an entirely new harness if you decide to change your vehicle’s chassis.
OBD1 Connectors and OBD2 Engine Compatibility
While Rywire harnesses use OBD1 (92-95) computer connectors, they can be used with OBD2a and OBD2b engines with the necessary computer adapter. Importantly, these harnesses do not directly support USDM OBD2 computers. However, they are compatible with aftermarket computers utilizing OBD2 plugs and non-USDM OBD2 computers (with the exception of stock H22 and GSR computers).
Comprehensive Connector List for Various Engine Components
The Rywire harness includes a comprehensive array of connectors for essential engine components:
- Oil Pressure Sending Unit: Monitors oil pressure for optimal engine lubrication.
- Knock Sensor: Detects engine knocking and adjusts timing for optimal performance.
- Intake Air Temperature (IAT) Sensor: Measures the temperature of the incoming air for precise fuel delivery.
- Oxygen Sensor (Primary 4 Wire): Measures the oxygen content in the exhaust gases for efficient combustion.
- OBD2 Alternator Plug: Connects to the alternator for charging the battery.
- Two Extra Wires: Provide flexibility for additional connections.
- OBD2 Injectors 1-4: Control fuel delivery to each cylinder.
- MAP Sensor: Measures manifold absolute pressure for air/fuel mixture calculations.
- TPS (Throttle Position Sensor): Monitors the throttle position for accurate engine control.
- Idle Control Motor: Regulates engine idle speed.
- Electronic Speed Sensor: Measures vehicle speed.
- Ground: Provides a secure grounding point.
- Fan Switch: Controls the engine cooling fan.
- OBD2 10-Pin Distributor Plug: Connects to the distributor for ignition timing.
- H20 Sending Unit: Provides coolant temperature data to the gauge cluster.
- Reverse Lights: Activates the reverse lights when the vehicle is in reverse.
- Engine Coolant Temperature Sensor: Measures engine coolant temperature.
- Starter Signal: Engages the starter motor.
- VTEC Solenoid: Controls the VTEC (Variable Valve Timing and Lift Electronic Control) system (if applicable).
- OBD1 Computer Plugs A, B, D: Connect to the engine control unit (ECU).
- Power Distribution Cap: Distributes power to various engine components.
Chassis-Specific Installation Instructions
Rywire provides detailed installation instructions for various chassis, ensuring a smooth installation process:
- 88-91 CRX/Civic: Guides you through installing the harness adapter for these specific models.
- 90-91 Integra DA: Provides instructions tailored for Integra DA models.
- 92-95 Civic & 92-95 Integra: Offers specific instructions for these vehicle generations.
- OBD2a Vehicles: Covers installation in vehicles with OBD2a systems.
- OBD2b Vehicles: Details the installation process for vehicles with OBD2b systems.
These instructions are available for download as PDF files on the Rywire website.
Conclusion
Rywire’s budget-friendly engine harnesses provide a reliable and cost-effective solution for Honda and Acura enthusiasts. Understanding their compatibility with OBD2 engines, particularly the requirement for a computer adapter for USDM applications, is crucial for a successful installation. The comprehensive connector list and available chassis-specific instructions further ensure a seamless integration with your vehicle. Remember to consult the specific documentation for your application to ensure proper installation and functionality.
