IHC Maxforce 9 is killing me.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by BoxCarKidd, Jan 20, 2022.

  1. BoxCarKidd

    BoxCarKidd Road Train Member

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    2007 IHC 4300.
    It has a yellow triangle comes on the dash and it shuts off. Sticker on the sunvisor says that means the dpf needs regeneration. It will not do a forced regen with the dash switch. Scan tool says it is good and does not need regeneration.
    The BAP always reads 13.9. This is the only truck like this here so I have nothing to compare it to. The actual barometric pressure here today is about 30. Could this be the problem? The ECM is trying to compensate for bad information? Bad part is the BAP sensor is built into the ECM. Makes for kind of expensive parts swapping.
    Then does a new ECM have to be flashed by the dealer for the truck?
     
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  3. Flint1

    Flint1 Heavy Load Member

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    New Ecm will need to be flashed. Check your units on the scan data, might be in psi. Baro of 30 sounds like mm of mercury.
    Yellow triangle is a general warning lamp and could be caused by anything. Body controller, abs etc.
    The only way the dash parked regen switch will work is if the dpf warning lamp is immuminated as well. It looks like this.. Screenshot_20220120-194048_Chrome.jpg
     
    Last edited: Jan 21, 2022
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  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    You are correct about Mercury and PSI. Is 13.9 PSI a problem?
    Need to drive it with the scan tool I thank. Try to see what comes up at the moment? Drive and come back with many. If it shuts off, turn the key off for a coupe seconds and turn it back on, then it comes back to life. That is good for a page full of codes.
    Thanks for the input! I will work on it.
     
  5. Flint1

    Flint1 Heavy Load Member

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    Google says sea level is 14.7 psi. 13.9 seems reasonable.
    Clear codes and see. Check all the modules you can for codes (abs etc)
    I'm familiar with the dt's in bus chassis. There is 3 small fuse holders in the battery box, they are the main feeds for ecm, tcm etc. They like to melt and cause intermittent issues. There is also a set of connectors near the starter for the same harness as the fuse holders. They like to discolor and melt. They cause a lot of stall issues with weird power related codes. Buses are based off the 4300 chassis.
    Need more info..
     
  6. BoxCarKidd

    BoxCarKidd Road Train Member

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    It does have an active ABS code. Will start there. Thank You and Goody.
     
  7. BoxCarKidd

    BoxCarKidd Road Train Member

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    I spent a lot of time on this again today. I began with a visual inspection of all the connectors mentioned. They look good.
    Back probed all the connectors by the stater with the key on. Powers to ground and ground to power through through a volt meter. They all read over 12V.
    Tested the output side of all the fuses and circuit breakers, in front of the passenger seat. They all read around 12.3. Looked at the ABS module in the right kick panel. Everything looks good. At least one wire has over 12V but the big red wire does not? Looks like plastic melted on the floor mat under it. I see none under the module and assume it is from a previous unit. Went to road tests.
    This truck has done different things different days that did not make since. Now it appears with more history it does not shut down when cold. Normally with fairly hard acceleration or going up a hill it would shut down in the upper RPM range.
    I planed where to make it shut down. Then I could shift from D to N and roll to a safe place. Then try to read flash codes and use the scanner. Normally I could not get much from the dash. It would say engine warning when it shut down and once it said 5 faults. Then I could not read them. It just maintained ABS code 251 and an a/c duct actuator code.
    The most common reocurring faults were:
    J1939 SPN 8064: Crankshaft Position signal inactive, open or short.
    J1708 SID 64 Engine speed sensor 2
    Where is sensor 2? The one on the flywheel reads .971k ( I hate that meter but the Fluke died ). That is within the 800 - 1000 acceptable range as I read it. I will check the wiring and connections at the ECM.
    Pete with a Cat here reads 14.8 barometric pressure today. I do not see how the engine would change how it functions with a 13.9 reading depending on if it was cold or warmed up.
    Thanks for the replies and input.
     
  8. Inderjit

    Inderjit Medium Load Member

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    I deal with this all the time with Maxxfarce 9 and 10 engines.
    Start with the battery connections at the batteries and at the starter. Confirm
    all the ground connections from the starter to the block and frame are good.
    There are 2 or 3 ground studs on the top left of the firewall. Make sure they
    are clean and tight. There is a 3 wire power and ground harness that
    connects to the battery cables in the battery box called the "Clean Power
    Harness" It supplies power and ground to the ECM. There is a 40 amp fuse
    in the battery box in the clean power harness as well as a large 3 pin Metripac
    connector check them both for corrosion. Follow the clean power harness
    to the firewall where it plugs into the chassis harness with another 3 pin
    Metripac connector. Check that connector as well. Look for expanded
    connectors and corrosion. The clean power harness is notorious for rubbing
    through and the wires corrode. I have seen them green with corrosion and
    no wire left inside the insulation just corrosion and the engine would still
    start and run.
     
  9. Inderjit

    Inderjit Medium Load Member

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    I had a Maxxfarce 9 that was towed the shop last week with emission
    faults that did not make sense It was derated and would only go 5
    miles per hour. I cleared the faults and took it for a drive.
    It logged more faults and derated. I typed the faults into "I Know Search"
    Navistars search engine on their service website. The first hit that came
    back was "Maxxfarce 9-10 ECM and ACM software needs to be updated"
    I connected NavKal Navistars update software to the truck and it said the
    ECM and ACM both needed a software update. I did the software update
    and the truck went back to work. It hasn't come back so I am assuming
    the update fixed it.

    Another Maxxfarce 10 I dealt with was on an island. They would start it in
    the morning and warm the engine up then drive 7 miles to load on a ferry.
    They were required to shut the engine off on the ferry. There was a no
    Idling rule. When they disembarked from the ferry they had to drive up a
    steep hill 15% 100 feet long. Even though the engine was warm it would
    clatter and shake and stall. It had an automatic transmission. If they started
    it 10 minutes before the ferry docked it drove up the hill fine. I could find
    nothing wrong with the engine other than the ECM needed a software update.
    I did the update and the problem went away.
    If the power supply is good you may need to get a dealer to do a software update.
     
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  10. BoxCarKidd

    BoxCarKidd Road Train Member

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    Today I thank I found a lot of the problem. The rear ecm connections. KIMG0505.JPG KIMG0504.JPG
    Cleaned them up and replaced the cam sensor also. It no longer shuts off. Thanks for the replies.
     
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