Would like a second opinion on this series 60 |
01-20-2025, (Subject: Would like a second opinion on this series 60 ) Post: #1 | |||
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Would like a second opinion on this series 60 I have this '98 pete 379 with a 12.7 ddec 3 in the shop here. Jakes sound like they're stuck on low, no matter the position of the switch. Has an active fault of [ACTIVE] Aux. output #3(S3) - ENG BRK MED - open circuit (high side) Flash: 31 ECM: Mas ID: S 51 FMI: 3 Start: 451 End: -- Duration: 03:10:37 Count: 1 Start Time: Feb21,23:51 I removed the valve cover and used a test light on each solenoid while the engine was running and activating jakes. I found no matter what setting the switch was on, only the front solenoid would get power. I removed the switch in the dash and tested it, which it is fine. I went through the troubleshooting tree, and it seems all the wiring checks out. I can activate the low side manually through the ecm and see there is power to the front solenoid. I activated the med/high side, and there was no voltage to the center/rear solenoid. I swapped in a test ecm, and could manually activate low/med/high and see there is voltage coming to the solenoids now. What I find odd - I'm still getting the exact same fault code active, but the jakes work correctly on low/med/high now while running. My test ecm is programmed for a Volvo with a 12.7, so maybe that could be the case? Any input would be appreciated, thank you! | |||
01-20-2025, (Subject: Would like a second opinion on this series 60 ) Post: #2 | |||
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RE: Would like a second opinion on this series 60 That harness is trash? You moved it around swapping ecms and now they work but the ecm can still detect a short to high? That harness is like 230$. Maybe replace the jake solenoids to and e done f%cking with it for 500$? | |||
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