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Cat 70 pin ecm diagnostic help.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by BoxCarKidd, Jul 17, 2016.

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  1. Jul 17, 2016 #1
    BoxCarKidd

    BoxCarKidd Road Train Member

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    3406E in a 06-99 Columbia. It has been parked and moved but then would not restart.
    I was righting a book but what I really want to know is what all the ECM pins go to so I can try to fix the problem.
     
    BoxCarKidd, Jul 17, 2016
    BoxCarKidd, Jul 17, 2016
    #1
    Sandy359 Thanks this.
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  3. Jul 17, 2016 #2
    Pablo-UA

    Pablo-UA Road Train Member

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    can you see CEL and Engine protection light when u turn ignition on?
     
    Pablo-UA, Jul 17, 2016
    Pablo-UA, Jul 17, 2016
    #2
    BoxCarKidd Thanks this.
  4. Jul 18, 2016 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

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    I will have to watch for that and get back to you.
     
    BoxCarKidd, Jul 18, 2016
    BoxCarKidd, Jul 18, 2016
    #3
  5. Jul 18, 2016 #4
    Animosus

    Animosus Heavy Load Member

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    [​IMG][​IMG]
     
    Animosus, Jul 18, 2016
    Animosus, Jul 18, 2016
    #4
    BoxCarKidd Thanks this.
  7. Jul 19, 2016 #5
    Pablo-UA

    Pablo-UA Road Train Member

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    usually weak place is battery power wire to ECM
     
    Pablo-UA, Jul 19, 2016
    Pablo-UA, Jul 19, 2016
    #5
    BoxCarKidd Thanks this.
  8. Jul 21, 2016 #6
    BoxCarKidd

    BoxCarKidd Road Train Member

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    52 & 53 are hot will burn a head light, 70 is not. Ended up with all battery + disconnected and a fused hot wire connected to ECM harness plug #70. Traced it to plug on fire wall #7. Inside comes out above throttle pedal and wire run into main harness in center of dash. Has no power to fuse panel, relays, or ignition switch.
    Anyone know if that goes through kick panel by clutch pedal or else where? Wire numbers?
     
    BoxCarKidd, Jul 21, 2016
    BoxCarKidd, Jul 21, 2016
    #6
  9. Jul 21, 2016 #7
    swaan

    swaan Road Train Member

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    What about pin 48? That's supposed to be positive+ also.
    Pin 70 should be hot when ign is in run position
     
    swaan, Jul 21, 2016
    swaan, Jul 21, 2016
    #7
    BoxCarKidd Thanks this.
  10. Jul 21, 2016 #8
    swaan

    swaan Road Train Member

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    Also check ecm grounds
    Pins 63,65,67
     
    swaan, Jul 21, 2016
    swaan, Jul 21, 2016
    #8
    BoxCarKidd Thanks this.
  11. Jul 21, 2016 #9
    BoxCarKidd

    BoxCarKidd Road Train Member

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    I see. Stopped at the first definite thing I found wrong and chased it. Could be more complicated, this rigs had a lot of leaks. Thanks for the tips!
     
    BoxCarKidd, Jul 21, 2016
    BoxCarKidd, Jul 21, 2016
    #9
  12. Jul 21, 2016 #10
    swaan

    swaan Road Train Member

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    You got 3 grounds and 3 hot.
    Plus the key on power on pin 70.

    If those are all good that engine should run
     
    swaan, Jul 21, 2016
    swaan, Jul 21, 2016
    #10
    BoxCarKidd Thanks this.
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