Onan 7k CMM EFI - Random Code 15

cad · 08-07-2023, 10:47 AM

Good morning,
Generator: 2001 7000 CMM EFI 7HGJAD-2139A, spec A.

Ive resolved my code 45. Have replaced belt and tensioner. Found a broken wire behind the switch, which was sad that I missed it, but, all the wires are white and it did have a broken chassis bolt and spring.

Now, randomly, the gen will start and run slow, then code 15. This is completely random. Ran Friday through Sunday at a race with no issues. I picked up a Killawatt meter, and when running well, it has perfect 120v and 60hz.

The following Friday night at races, it started, smoked, code 15. Saturday morning back at home, it started right up and ran fine for an hour.

Ran it last weekend for 2 days and no issues. The following Saturday, same thing, code 15, and had to use the little generac generator.

I did put new plugs in a few weeks ago, and the last two 25 gallons tanks of fuel have been 91 octane, no ethanol.

Ideas?

Thank you,
Clark
Omaha

08-07-2023, 10:47 AM	#1
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 685 Likes: 163 Liked 80 Times in 45 Posts	Onan 7k CMM EFI - Random Code 15 Good morning, Generator: 2001 7000 CMM EFI 7HGJAD-2139A, spec A. Ive resolved my code 45. Have replaced belt and tensioner. Found a broken wire behind the switch, which was sad that I missed it, but, all the wires are white and it did have a broken chassis bolt and spring. Now, randomly, the gen will start and run slow, then code 15. This is completely random. Ran Friday through Sunday at a race with no issues. I picked up a Killawatt meter, and when running well, it has perfect 120v and 60hz. The following Friday night at races, it started, smoked, code 15. Saturday morning back at home, it started right up and ran fine for an hour. Ran it last weekend for 2 days and no issues. The following Saturday, same thing, code 15, and had to use the little generac generator. I did put new plugs in a few weeks ago, and the last two 25 gallons tanks of fuel have been 91 octane, no ethanol. Ideas? Thank you, Clark Omaha Last edited by cad; 10-27-2023 at 12:36 PM.