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No crank

Discussion in '1st Gen. Tacomas (1995-2004)' started by aeayon, Nov 7, 2022.

  1. Nov 21, 2022 at 6:42 PM
    #21
    aeayon

    aeayon [OP] Well-Known Member

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    I checked the grounds on the Cylinder heads with the test light on + of the battery and everything appears to be good. Test light lights at all locations but the coil packs
     
  2. Nov 21, 2022 at 6:44 PM
    #22
    Dm93

    Dm93 Test Don't Guess

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    Did you give all the wires on that ground a tug test to make sure none are broken internally?
     
  3. Nov 21, 2022 at 6:48 PM
    #23
    aeayon

    aeayon [OP] Well-Known Member

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    Ok I appolgize I was probing the wrong wire my son with much younger eyes found the white/blk does have gnd
     
  4. Nov 21, 2022 at 6:50 PM
    #24
    Dm93

    Dm93 Test Don't Guess

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    Ok do you have a scan tool that can read live data to see if you have RPM while cranking?
     
  5. Nov 21, 2022 at 6:53 PM
    #25
    aeayon

    aeayon [OP] Well-Known Member

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    Ok this is where I might fall off on the knowledge… excuse me I don’t understand
     
  6. Nov 21, 2022 at 6:57 PM
    #26
    Dm93

    Dm93 Test Don't Guess

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    I'm trying to determine if the PCM is seeing a crank signal or not, if you have a scanner that can read live data you can look at the RPM PID and see if it shows around 200 RPM while cranking. If you don't have a scanner alternatively you can look at the tachometer and see if it moves while cranking.
     
  7. Nov 21, 2022 at 7:01 PM
    #27
    aeayon

    aeayon [OP] Well-Known Member

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    The tach doesn’t move
     
  8. Nov 21, 2022 at 7:03 PM
    #28
    aeayon

    aeayon [OP] Well-Known Member

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    I’m trying to upload a picture of my code scanner but I don’t think it does live
     
  9. Nov 21, 2022 at 7:10 PM
    #29
    Dm93

    Dm93 Test Don't Guess

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    You can do a visual inspection of the crank sensor wiring, the crank sensor is behind the A/C compressor and I believe the wiring runs up behind the alternator.
     
  10. Nov 21, 2022 at 7:12 PM
    #30
    aeayon

    aeayon [OP] Well-Known Member

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    Ok so should I replace the crank sensor
     
  11. Nov 21, 2022 at 7:14 PM
    #31
    Dm93

    Dm93 Test Don't Guess

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    I wouldn't just throw a sensor at it, inspect the wiring first. You said the truck died when you hit a bump and hasn't started since?
     
  12. Nov 21, 2022 at 7:16 PM
    #32
    aeayon

    aeayon [OP] Well-Known Member

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    Yes sir that’s right! I’ll pull skid plates and inspect wires and will follow up with you! I really appreciate all the help!
     
  13. Nov 21, 2022 at 7:18 PM
    #33
    O'Silver_Taco

    O'Silver_Taco Well-Known Member

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    In gen1 fsm diagnostics.....it shows how to test the crank sensor with ohm meter......
     
  14. Nov 21, 2022 at 7:20 PM
    #34
    TnShooter

    TnShooter The TacomaWorld Stray

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    It does in the 2nd Gen too.
    But just because it ohms good, doesn’t mean it’s good.
    If it’s WAAAAYYY out of spec, I might consider throwing parts at it.
    Dm93 is right on the crank signal to ECM/tach. It’s a bit more “reliable”, If the wiring is good to the sensor. Be nice to see live data.

    1. Using an ohmmeter, measure the resistance between the terminals.



      Standard:
      1850 to 2450 Ω at 20°C (68°F)


      If the result is not as specified, replace the crankshaft position sensor.
     
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  15. Nov 21, 2022 at 7:23 PM
    #35
    Dm93

    Dm93 Test Don't Guess

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    I wish I could help more, you can check the integrity of the crank sensor wires to the PCM and check for shorts to ground with a meter but it takes an oscilloscope to check the sensor properly.
     

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  16. Nov 21, 2022 at 7:26 PM
    #36
    aeayon

    aeayon [OP] Well-Known Member

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    For me it’s probably worth the 60$ bucks
     
  17. Nov 21, 2022 at 7:29 PM
    #37
    Dm93

    Dm93 Test Don't Guess

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    But is it worth 3-4 hrs of your time to remove the alternator, A/C compressor, and A/C compressor bracket to replace it as a guess?
     
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  18. Nov 21, 2022 at 7:30 PM
    #38
    TnShooter

    TnShooter The TacomaWorld Stray

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    What model scanner do you have?

    Even the cheaper ones will show most generic live data.
     
  19. Nov 21, 2022 at 7:35 PM
    #39
    O'Silver_Taco

    O'Silver_Taco Well-Known Member

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    No it does not....
     

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  20. Nov 21, 2022 at 7:39 PM
    #40
    O'Silver_Taco

    O'Silver_Taco Well-Known Member

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    That crank sensor is so important.....I keep a brandnew denso one for spare.......along with maf......

    so wouldnt kill you to have a backup......

    Kinda of pricey tho....



    same on ignition switch......

    CIMG5015.jpg
     

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