Mitsubishi Galant ES OBD2 Rewire: Your Complete Guide

Understanding your Mitsubishi Galant ES’s OBD2 system can seem daunting, especially when it comes to rewiring. Whether you’re troubleshooting a malfunctioning OBD2 port, installing an aftermarket device, or simply want to learn more about your car’s electronics, this guide is for you. We’ll cover everything from the basics of OBD2 to the specifics of rewiring on a Mitsubishi Galant ES.

What is OBD2 and Why Should You Care?

OBD2, short for On-Board Diagnostics, second generation, is a standardized system that allows external electronics to communicate with your vehicle’s computer. This port, often located under the dashboard on the driver’s side, acts as a window into your car’s engine, transmission, emissions system, and more. Mechanics and car enthusiasts use OBD2 scanners to:

Diagnose engine codes: Identify the root cause of that pesky “check engine” light.
Monitor vehicle performance: Track fuel efficiency, engine load, and other crucial parameters.
Customize car settings: In some cases, you can even adjust certain vehicle features.

When Might You Need to Rewire Your Mitsubishi Galant ES’s OBD2 Port?

While rewiring your OBD2 port is not a common task, there are a few scenarios where it might be necessary:

Damaged OBD2 port: Accidents happen, and your OBD2 port can be damaged, requiring a rewire.
Aftermarket device installation: Installing devices like remote car starters or performance trackers may involve splicing into your OBD2 wiring.
Custom wiring projects: For the electronically inclined, rewiring your OBD2 port can enable unique integrations and modifications.

A Word of Caution: Rewiring your OBD2 port should not be taken lightly. Incorrect wiring can damage your vehicle’s electronics. If you’re not comfortable working with car electronics, it’s best to consult a qualified mechanic.

Understanding Your Mitsubishi Galant ES’s OBD2 Pinout

The OBD2 port has 16 pins, each with a specific function. Knowing what each pin does is essential for successful rewiring. Here’s a breakdown of the standard OBD2 pinout:

Pin 1: Manufacturer-specific
Pin 2: J1850 Bus+
Pin 3: Manufacturer-specific
Pin 4: Chassis Ground
Pin 5: Signal Ground
Pin 6: CAN High (J-22848)
Pin 7: ISO 9141-2 K-Line
Pin 8: Manufacturer-specific
Pin 9: Manufacturer-specific
Pin 10: J1850 Bus-
Pin 11: Manufacturer-specific
Pin 12: Manufacturer-specific
Pin 13: Manufacturer-specific
Pin 14: CAN Low (J-22848)
Pin 15: ISO 9141-2 L-Line
Pin 16: Battery Voltage

Note: Some pins may have manufacturer-specific functions, so always consult your Mitsubishi Galant ES’s service manual for precise information.

Tools You’ll Need for OBD2 Rewiring

Before you begin, gather the following tools:

Wire strippers/cutters
Electrical tape
Soldering iron and solder (optional but recommended)
Multimeter
Mitsubishi Galant ES service manual
Zip ties

Mitsubishi Galant ES OBD2 Rewiring: A Step-by-Step Guide

Disclaimer: This is a general guide. Always refer to your Mitsubishi Galant ES’s service manual for model-specific instructions.

Disconnect the battery: This is crucial to prevent electrical shorts.
Locate the OBD2 port: It’s usually under the dashboard on the driver’s side.
Identify the wires: Consult your service manual for the specific wires you need to access.
Splice or tap into the wires: Use a wire stripper to expose the wire core. For splicing, connect the wires using a soldering iron (recommended) or twist-on connectors. For tapping, use a tap connector appropriate for the wire gauge.
Insulate the connections: Use electrical tape or heat shrink tubing to insulate all exposed wiring.
Secure the wiring: Use zip ties to neatly secure the new wiring and prevent it from interfering with other components.
Reconnect the battery: Ensure all connections are secure before reconnecting the battery.
Test the connection: Plug in an OBD2 scanner and verify that it communicates with your vehicle’s computer.

Common Issues and Troubleshooting

No power to the OBD2 port: Check the fuse related to the OBD2 port or cigarette lighter (often on the same circuit).
Scanner doesn’t communicate: Verify wiring connections and pin assignments. Ensure the scanner is compatible with your Mitsubishi Galant ES’s model year.
Error codes persist after rewiring: Double-check all connections and consult your service manual for troubleshooting steps.

Conclusion

Rewiring your Mitsubishi Galant ES’s OBD2 port can be a rewarding task for those comfortable working with car electronics. Always prioritize safety and consult your service manual for model-specific guidance. Remember, a deep understanding of your car’s electronics can unlock a world of possibilities.