If you’re dealing with aftermarket engine management systems or tuning your vehicle, you need a reliable wideband O2 sensor. AEM Electronics is a reputable brand that manufactures high-performance electronics for the automotive enthusiast market. Their wideband O2 sensor kit, the AEM 35-8460, is designed to measure the air/fuel ratio of your engine accurately. In this article, we’ll discuss everything you need to know about the AEM Wideband 35 8460 Wiring Diagram. We’ll cover the installation process, potential issues, and how to fix them, and more.
What is the AEM Wideband 35 8460?
The AEM Wideband 35 8460 is a UEGO (Universal Exhaust Gas Oxygen) sensor controller that uses Bosch LSU 4.2 wideband sensor technology. It’s a standalone unit that provides accurate air/fuel ratio readings for carbureted and fuel-injected engines. The kit includes a gauge, wiring harness, sensor, weld-in bung, and mounting hardware.
The AEM Wideband 35 8460 gauge displays air/fuel ratio on a 52mm diameter gauge face with a sweeping LED “needle” that moves from left to right as the ratio changes from lean to rich. The gauge also features a 0-5V analog output for data logging or interfacing with other engine management systems. The included Bosch LSU 4.2 sensor is a closed-loop system calibrated to the stock 14.7:1 air/fuel ratio.
Installation Process
Before we begin, make sure you have all the necessary tools and equipment. You’ll need a drill, a 7/8″ drill bit, a 1-1/16″ wrench, a 22mm wrench, a wire stripper, a crimping tool, and electrical tape. Here are the steps:
- Locate an optimal position for the O2 sensor bung. It should be placed within 18 inches of the exhaust manifold.
- Drill a 7/8″ hole in the exhaust pipe or manifold. Use a center punch to mark the center of the hole and apply lubricant to the drill bit to prevent it from overheating.
- Insert the weld-in bung into the hole and weld it into place. Make sure the bung is tightly secured and that there are no leaks.
- Install the Bosch LSU 4.2 sensor into the bung. Use the 22mm wrench to tighten the sensor into place.
- Route the wiring harness through the firewall and connect the harness wires to the corresponding inputs on the AEM Wideband 35 8460 gauge. Refer to the wiring diagram for proper connections.
- Connect the gauge’s power and ground wires to the vehicle’s electrical system. You can use a fuse tap to connect the power wire to a fuse that’s only active when the ignition is on.
- Once you’ve completed the installation process, start the engine and let it idle for a few minutes to allow the sensor to warm up. The gauge should display the air/fuel ratio.
Wiring Diagram
Here’s the wiring diagram for the AEM Wideband 35 8460:
| Wire Color | Function | Connection |
|---|---|---|
| Red | 12V Switched Power | Connect to a fuse that’s only active when the ignition is on |
| Black | Ground | Connect to a clean chassis ground point |
| Green | Serial Data Output | Connect to a data logger or other engine management system |
| Yellow | 0-5V Analog Output | Connect to a data logger or other engine management system |
| White | Sensor Input | Connect to the Bosch LSU 4.2 sensor output wire |
Potential Issues and Troubleshooting
Although the AEM Wideband 35 8460 is a reliable and durable device, there might be some issues you could potentially face. Let’s take a look at some of the possible issues and how to troubleshoot them:
Gauge Display Error Codes
The first thing to do is to check the gauge display for any error codes. The AEM Wideband 35 8460 gauge has built-in error codes that help you diagnose potential issues. Here are some of the error codes and their meanings:
| Error Code | Description |
|---|---|
| 0 | No error |
| 1 | Calibration error – sensor not calibrated |
| 2 | Calibration error – sensor not connected or disconnected during operation |
| 3 | System error – voltage outside of operating range |
| 4 | System error – sensor output voltage too high |
| 5 | System error – sensor output voltage too low |
| 6 | System error – internal processor error |
If the gauge displays an error code, consult the AEM Wideband 35 8460 manual for instructions on how to fix it. In some cases, you might need to recalibrate the sensor or check the wiring connections.
Wiring Issues
If the gauge displays an error code related to the wiring, check the wiring connections. Make sure all the connections are tight and secure. Use a multimeter to test the continuity of the wires and check for any breaks or shorts in the wiring harness. If you find any issues with the wiring, repair or replace the affected wires.
Sensor Issues
If the gauge displays an error code related to the sensor, make sure the sensor is properly connected and calibrated. Check the sensor’s output voltage using a multimeter. The voltage should be around 0.1V at idle and 0.9-1.1V at full throttle. If the sensor is not reading correctly, replace it with a new one.
Conclusion
The AEM Wideband 35 8460 is an excellent tool for measuring the air/fuel ratio of your engine accurately. By following the installation process and the troubleshooting tips, you can ensure that the sensor is working correctly and providing accurate readings. Remember to consult the manual if you encounter any issues or error codes. With the AEM Wideband 35 8460, you can optimize your engine’s performance and achieve your desired air/fuel ratio for maximum power and efficiency.
FAQ
What is a wideband O2 sensor?
A wideband O2 sensor is an oxygen sensor that measures the air/fuel ratio in a combustion engine. It provides more accurate readings than a traditional narrowband sensor, allowing you to fine-tune your engine’s performance for maximum power and efficiency.
What is the Bosch LSU 4.2 sensor?
The Bosch LSU 4.2 sensor is an oxygen sensor that is commonly used in wideband O2 sensor systems. It is a closed-loop system calibrated to the stock 14.7:1 air/fuel ratio.
What is a UEGO sensor controller?
A UEGO (Universal Exhaust Gas Oxygen) sensor controller is a standalone device that provides accurate air/fuel ratio readings for carbureted and fuel-injected engines. It typically includes a gauge, wiring harness, sensor, weld-in bung, and mounting hardware.
