The 1JZGTE engine swap into a Lexus IS300 is a popular modification for performance enthusiasts. While relatively straightforward mechanically, the wiring can present a significant challenge. This guide focuses specifically on the 1jzgte Obd2 Wiring aspects of this swap, providing insights to help you navigate this complex process. This article specifically focuses on using a JZS171 1JZ-GTE VVTI engine and its associated ECU.
Understanding the 1JZGTE OBD2 Wiring Challenge
The primary hurdle in the 1JZGTE swap lies in integrating the engine’s electronics with the IS300’s existing chassis harness. Using the JZS171 ECU, you’ll find the JZX110 pin diagram mirrors the JZS171 pinout precisely. However, this doesn’t mean a plug-and-play scenario. Repinning the body harness is unavoidable and requires meticulous attention to detail. While time-consuming, with the right tools and patience, it’s manageable. You’ll likely have unused wires; these can be trimmed and insulated.
Key Wiring Considerations: Gauges, Fuel, and A/C
Beyond the main harness, several specific wiring points require attention:
- Gauges: The coolant temperature and MPG gauges will not function correctly with the stock IS300 cluster after the swap. External gauges will be necessary for accurate readings.
- Fuel System: Upgrading to an Aristo fuel pump hanger simplifies the fuel delivery setup. Utilize the 5/6th line for the fuel return. Expect the fuel light to flash continuously; a simple solution is to cover it.
- A/C System: The A/C system will not function without modification. A custom control box, available from certain specialists (such as Yury Baranov), is required to integrate the 1JZGTE’s A/C compressor with the IS300’s system. This allows for ECU-controlled idle-up and compressor engagement.
Additional Tips for a Successful Swap
- Transmission: While using the stock IS300 A340LE transmission is possible, the 1JZGTE’s A340E 4-speed automatic transmission is generally considered a stronger and more suitable option. A simple fluid and filter change, along with new seals and a higher stall torque converter, can greatly improve performance.
- Exhaust: Performing a J-pipe delete can improve exhaust flow.
- Tuning: Utilizing a piggyback ECU with MAF clamping capabilities or adding an airflow straightener is often necessary for optimal engine performance, especially with the stock turbo.
- Driveshaft: The stock IS300 driveshaft is compatible with the 1JZGTE.
- LSD: An aftermarket Limited Slip Differential (LSD) is highly recommended for improved traction and handling.
Conclusion
The 1JZGTE OBD2 wiring is undoubtedly the most challenging part of this engine swap. While repinning the harness is essential, understanding the specific wiring needs for gauges, fuel, and A/C is crucial for a fully functional and enjoyable driving experience. With careful planning, patience, and attention to detail, successfully integrating the 1JZGTE into your IS300 is achievable. Remember, having the right tools and resources, including wiring diagrams and community support, will greatly contribute to a successful swap.
