ABS PROBLEM!!

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Perchie15, Jul 16, 2022.

  1. Perchie15

    Perchie15 Light Load Member

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  3. spsauerland

    spsauerland Road Train Member

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    He has two threads going on about this truck, I will just post in this one. It does indeed have Bendix ABS. Its a B cab truck, so no VECU. It would need the Y harness for certain data interface adapters, but I think that some aftermarket scan tools don't require it because the can connect to both the 250K and 500K data buses no problem. Friend has the Snap-on Pro Link IQ and it never has needed Y harness. It gets confusing! The fuses for ABS are B11 (10 A IGN) and D12 (30 A Batt). Uploaded diagram and ECU hotel location. What scan tool are you using?
     

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  4. Perchie15

    Perchie15 Light Load Member

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    Im using a snap on prolink ultra! And it doesn’t pick up any ABS just the Cummins engine abs the J19137 plug? Or whatever it is for the main wiring of the truck! Wow thx so much!!! Kenworth still hasn’t sent me an email regarding the wiring waiting for days. Thx!!! Is there a way to open that box that’s above the ABS ECU?cuz has the 2 clasps that look like it should! I did find those fuses in the fuse box but all of them were good
     
    Last edited: Jul 19, 2022
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  5. spsauerland

    spsauerland Road Train Member

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    That's the CECU, and leave it alone!!! Verify your power and grounds and data link connections to ABS ECU.
     
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  6. flood

    flood Road Train Member

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    This my help.

    My 2015 prostar has a glitch like this.
    The code will not reset even after the truck is turned off and back on. But when the dealer plugs in it shows no active code, lights still on and no self test at start up..

    What I've found (with my truck) is if I kill the batteries, i have a battery disconnect if you dont disconnect the Positive cable for 5min then turn every thing back on and start it... the codes still show it'll I drive to about 5-6 mph then they clear... even the dealer doesn't understand why it does this
     
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  7. Perchie15

    Perchie15 Light Load Member

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    Now that I see the schematics. I guess I do have power coming from the ignition and battery source. Power from the SLS too! And the grounds all work according to my test light. Thinking must be the ECU?
     
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  8. Perchie15

    Perchie15 Light Load Member

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  9. Inderjit

    Inderjit Medium Load Member

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    With the key off measure between the J1939 pins in the ABS connector you should read 60 Ohms.
    With the key on measure between both J1939 wires and a ground They should both be close ro 2.5 volts with one slightly higher than the other.
     
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  10. Perchie15

    Perchie15 Light Load Member

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    I got 61 ohms with key off
    And key on one was 1.80 other 1.61
     
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