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Question about Caterpillar Electronic Technician ?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by sunsation288, Nov 19, 2014.

  1. Nov 19, 2014 #1
    sunsation288

    sunsation288 Light Load Member

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    Jan 12, 2014
    0
    Hello all , i have low oil pressure diag code on a 3406E , i need to know why i have a DIAG in first Row ? what they mean ?
    i have a mechanical gage and i have over 40 pound of pressure
    thanks for helping
    [​IMG]
    [​IMG]
     
    sunsation288, Nov 19, 2014
    sunsation288, Nov 19, 2014
    #1
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  3. Nov 19, 2014 #2
    sunsation288

    sunsation288 Light Load Member

    55
    54
    Jan 12, 2014
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    i have fault for low oil pressure , i have change the sensor , and it's not helping
    [​IMG]
    [​IMG]
     
    sunsation288, Nov 19, 2014
    sunsation288, Nov 19, 2014
    #2
  4. Nov 19, 2014 #3
    peterbilt_2005

    peterbilt_2005 Medium Rare

    3,906
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    May 4, 2013
    Commie-fornia come visit we have C. A. R. B
    0
    Did you have a new oil sensor installed. I've had the same issue. Mechanical showed 40 psi. Gauge didn't.

    If not sensor, time to chase wire to dash gauge and check ecm.
     
    peterbilt_2005, Nov 19, 2014
    peterbilt_2005, Nov 19, 2014
    #3
  5. Nov 19, 2014 #4
    sunsation288

    sunsation288 Light Load Member

    55
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    Jan 12, 2014
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    thanks for the fast respond , yes we have try new sensor , it's a 1999 peterbuilt 379 , i have only a mechanical gauge , but a Check Engine light on until the motor reach is working temperature , after the light come off ....weird problem ?
    i will check back when the truck will be here in the end of this afternoon to see if i monitor oil pressure with ET20011b
     
    sunsation288, Nov 19, 2014
    sunsation288, Nov 19, 2014
    #4
  7. Nov 19, 2014 #5
    maggard359

    maggard359 Medium Load Member

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    Nov 20, 2013
    Florida
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    May take fitting out and see if trash is in galley or just move to manual location and try. You will need to run wires for test in new location.
     
    maggard359, Nov 19, 2014
    maggard359, Nov 19, 2014
    #5
  8. Nov 19, 2014 #6
    sunsation288

    sunsation288 Light Load Member

    55
    54
    Jan 12, 2014
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    Thanks maggard for helping , have you idea why is DIAG in the column just beside oil pressure in ET ?
     
    sunsation288, Nov 19, 2014
    sunsation288, Nov 19, 2014
    #6
  9. Nov 19, 2014 #7
    maggard359

    maggard359 Medium Load Member

    476
    413
    Nov 20, 2013
    Florida
    0
    Oil pressure is not a de rate fault just a diagnostic fault. The ecm compensates for faulty pressure 87 psi I believes. Once you get sensor reading and then you can clear fault. I am not well versed on et, but somewhat familiar. I see electrical tape in your pictures might have some corrosion going on under there.
     
    maggard359, Nov 19, 2014
    maggard359, Nov 19, 2014
    #7
  10. Nov 19, 2014 #8
    GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    DIAG in ET means that there is a problem than needs to be diagnosed. Looks like yo have a wiring issue to me.
     
    GrapeApe, Nov 19, 2014
    GrapeApe, Nov 19, 2014
    #8
  11. Nov 21, 2014 #9
    uvulabruzr

    uvulabruzr Bobtail Member

    36
    13
    Nov 1, 2014
    CANADA...EH
    0
    verify oil pressure at the port where the sensor is plugged in, if you have oil pressure which you probably do I would suspect that you have a wiring issue to the ecm.
     
    uvulabruzr, Nov 21, 2014
    uvulabruzr, Nov 21, 2014
    #9
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