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ELCU Wire (Pin 3B) Function

Old 09-16-18, 07:01 PM
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ELCU Wire (Pin 3B) Function

I've been going through several wiring diagrams for standalones in order to prepare for installing my M2000 and I can't find anything that suggests the electrical load control unit needs to be hooked up to the new ECU. Unless I've gotten worse at searching, there doesn't appear to be much information on the forum about what the heck this thing does and if I need it. I have a few questions:

1. Does anyone know what this actually does?
2. If pin 3B is an output from the ECU, can it be programmed to kick on the check engine light through the ELCU? If so, I wouldn't mind powering it as an indicator light.

Any info would help and my apologies if I missed a post somewhere that already has this info.

-Zach-
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Old 09-17-18, 01:51 PM
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Originally Posted by zjbarra View Post
I've been going through several wiring diagrams for standalones in order to prepare for installing my M2000 and I can't find anything that suggests the electrical load control unit needs to be hooked up to the new ECU. Unless I've gotten worse at searching, there doesn't appear to be much information on the forum about what the heck this thing does and if I need it. I have a few questions:

1. Does anyone know what this actually does?
2. If pin 3B is an output from the ECU, can it be programmed to kick on the check engine light through the ELCU? If so, I wouldn't mind powering it as an indicator light.

Any info would help and my apologies if I missed a post somewhere that already has this info.

-Zach-
Hi Sir,

What this does is when the headlights, PS, or Heater controls are activated it will let the ECU know that there is a higher electrical load on the system. This promps the ECU to raise the idle effort in order to compensate for the extra drag on the engine created by the alternator trying to generate more power for the extra load.

That input is a digital input and not an output so it cannot trigger the check engine light.

If you wanted to connect the check engine light to the following pins it would display when you either have a fault or IE if you hit any type of rev limit.

Pin 4O or 4P

Then you will need to set either of those outputs to Checklight duty cycle

Thanks,

Shawn Christenson
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