Just another day with this ISX

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by HoneyBadger67, Oct 17, 2020.

  1. HoneyBadger67

    HoneyBadger67 Road Train Member

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    08 T660 ISX CM871

    Visor lights went out and I found a frayed wire. Took out the stuff iver the dash to feed more wire through visor hole and patched up wiring. Lights still didn't work, so I went through the box checking fuses. Got lights working again but now when I turn the key on my digital display goes to all dashes. Tried kicking the throttle 3X to see if there was a code but got nothing. As far as I know, I didn't step on any wires under the hood, just the valve cover. The lift pump doesnt work either...that's the first thing I checked when engine cranked but wouldn't start. Here's a picture of my display 16029807921278999808134375903375.jpg
     
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  3. AModelCat

    AModelCat Road Train Member

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    I'd recheck the wiring in the area you were working in. Looks to me like maybe the ECM isn't powering up.
     
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  4. Goodysnap

    Goodysnap Road Train Member

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    I agree with above. Knocked off a main power cable somewhere that was weak? Give a good look over wherever you went.
     
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  5. HoneyBadger67

    HoneyBadger67 Road Train Member

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    Is there an ECM fuse?

    I found a 50A and a 60A on the firewall but those seem to big for that application
     
  6. HoneyBadger67

    HoneyBadger67 Road Train Member

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    Checked all the connectors, they seem to be plugged in properly. It has "road relay 4" on it and all those connections seem okay, too.
     
  7. woolybully35us

    woolybully35us Light Load Member

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    check the ecm fuses in the battery box
     
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  8. Claytonbigsby

    Claytonbigsby Bobtail Member

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    The blank dashes are a common glitch with both Peterbilt and KW many models, doesn’t matter what engine, there was an update to fix them years ago but it never really fixed them.
    Sometimes if you turn off the key for a few minutes until everything is asleep then open your door and they will work properly again. Rarely will they stay blank for more than a day
     
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  9. HoneyBadger67

    HoneyBadger67 Road Train Member

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    Having the door open, numbers show. With the key on, though, all I get is dashes
     
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  10. D.Tibbitt

    D.Tibbitt Road Train Member

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    That happened with my pete couple months ago. 15 mins and disconnect the batteries the reconnect fixed the problem
     
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  11. HoneyBadger67

    HoneyBadger67 Road Train Member

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    Will try that next
     
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