Your Honda's Electronic Load Detector and How to Replace It (With Video)
This article, via video, shows you how I replaced a malfunctioning electronic load detector (ELD) and tested a new one in a 2008 Honda Accord. The car's MIL (manufacturer indicator lamp) was on and contained the DTC (diagnostic trouble codes) of P1297 and P1298, pointing to a defective ELD (electronic load detector).
Hondas have a device in the fuse box called a Electronic Load Detector (ELD). It works with the car's computer (PCM), which controls electrical output current to the car's battery. When it malfunctions, in most instances it will drain your battery.
The alternator, working in conjunction with the car's computer and battery, provides continuous 12-volt electrical current for a vehicle's various electrical components. The car's computer, called a power train control module (PCM), works with a electrical device in the fuse box called a electronic load detector (ELD) to determine where to draw current; that is, from the battery or from the alternator.
Under conditions of low engine load or engine idle, the PCM distributes current from the battery only and shuts down the alternator as a fuel-saving measure. With the alternator shut down, there's less drag on the engine from having to turn the alternator to generate current (the alternator spins with no load).
If the ELD malfunctions, there may be too much draw on the battery, resulting in a battery discharge situation. And if the alternator is also shut down, the car will not have enough current to operate efficiently, resulting in the "battery low" indicator lamp in the instrument cluster flickering on and off. Moreover, a malfunction indicator lamp (MIL or commonly referred to as "check engine") may be triggered with stored diagnostic codes (DTC) of P1297 (current too low) or P1298 (current too high).
Here's how to replace your ELD.
Video: Installing a New Replacement Electronic Load Detector (ELD) in a 2008 Honda Accord
This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.
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