Hi All! New to this forum. I'm grabbing for straws at this point. I have a 2009 IC CE300 school bus with a Maxxforce Dt engine, Allison 3000 transmission. Bus has 105xxx miles on it. Where I am we are owner operators ;( The bus broke a little over a month ago it just randomly was shutting off so I brought it in. I bring it to the local international dealership here. They said a fuse fixed it and went on my way two days later it began behaving weird all sorts of lights coming on the dash, brought it into the international place here and they diagnosed it with a bad ECM, replaced ECM.(ECM had burnt pins on the gray plug) Bus was still just randomly shutting off and crank right back up. I did notice that when you first click the key on there was an * that said low coolant level and it would just disappear. The dealership said I had a bad engine harness, replaced the wires in the harness. Picked bus up, kept doing same thing. They've checked ground wires, harnesses, ICP etc and can't find anything wrong. When its placed on the computer, they get no fault codes. All levels of everything are perfect (oil, fuel, etc etc). They seriously told me that had no clue what was wrong and have been in contact with Navistar. Last communication I had with them was that they've ruled out a harness issue that it has to be a circuit issue but theres 200 circuits. They tell them test this that etc and it comes out normal. I'm at my ropes end as I've had to rent a bus daily until mine is fixed, plus the note that I'm paying on mine while it sits in the shop. It has been sitting now for a month. Anyone experience this? I'm ready to throw the entire bus away but I can't ;(
09 Maxxforce Dt Electrical Problems
Discussion in 'International Forum' started by butsie81, Sep 22, 2018.
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Ok first, the low coolant message is normal, just a start up thing. If the unit is logging no codes, then it must be losing ignition power. If the engine is shutting off without the key turned off, then the body controller, abs and cluster will be logging codes for loss of communication with engine controller. Check all your ignition related fuses in the side electrical hatch to make sure everything is ok and not corroded. At that point, you might have to get it running, and then start wiggling wires all over unit you find the bad spot and the engine shuts down.
butsie81 and QUALITYTRUCK Thank this. -
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Since the "Low Coolant" is a start up message, that further points to the engine losing ignition power when this happening. The dealer may have been only looking at battery power, not ignition.
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Heavyd Thanks this.
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In situations like yours, the laptop is the first tool I grab. You are dealing with an electronic engine so you need to know if any codes are getting logged. After that, you can monitor many engine parameters such as fuel pressure, ICP pressure, battery voltage and so on also with the computer. Without taking those steps you will continue to blindly throw money and parts at it until something sticks. Your next move is to get this scanned to see what is getting logged.
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