1997 FZJ80 - Cranks but wont start. No CEL

Discussion in '80-Series Tech' started by unwiredadventures, Jun 21, 2017.

  1. unwiredadventures

    unwiredadventures www.unwiredadventures.com

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    Out of the blue, one day it would crank, but not start:(

    No Check Engine Light with ignition key turned

    Checked voltage through all fusable links: All good
    Checked all fuses: All good
    Checked voltage in under hood fuse box: All good
    Replaced EFI relay
    Checked voltage on interior OBD2 and under hood test port: All good
    No spark
    No voltage on coil power supply wires.
    I did a quick inspection on the wires near the EGR and they seem ok.

    I'm about test and inspect the ECM wiring.

    What's the most likely cause?

    I'd appreciate any ideas, so I can check those first.
     
    Last edited: Jun 26, 2017
  2. fourtrax

    fourtrax SILVER Star

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    check the resistance on your coil
    and you spark plug wires.
    how does the inside of you cap and rotor look
    how old are your plugs

    Captures.JPG
     
  3. Kentex Rick

    Kentex Rick

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    Check your battery! They go bad when it get's hot.
     
  4. unwiredadventures

    unwiredadventures www.unwiredadventures.com

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    Unfortunately, there is no voltage on coil power supply wires

    The engine cranks perfectly
     
  5. fourtrax

    fourtrax SILVER Star

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    does it have an alarm?

    if yes, there is usually a little button in the wiring harness you can hold in to bybass the circuitry and try to start it. there are also a few fuses in that area usually taped up you should look for and check as well.
     
  6. unwiredadventures

    unwiredadventures www.unwiredadventures.com

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    I had the aftermarket alarm removed six years ago at the Toyota dealership. The alarm had a remote start. Thanks, I'll check this too.
     
  7. fourtrax

    fourtrax SILVER Star

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    not sure if you have a manual.

    Check wiring between ignition switch to ignition
    coil and igniter.
     

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  8. unwiredadventures

    unwiredadventures www.unwiredadventures.com

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    I do but it's not in color :)

    Thanks!
     
  9. Malleus

    Malleus

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    Here's tidbit for those who are color challenged:
    [from the '94 FSM]
    upload_2017-6-22_9-44-19.png

    [from the '95 FSM]
    upload_2017-6-22_9-47-8.png

    upload_2017-6-22_9-47-22.png

    upload_2017-6-22_9-47-38.png

    upload_2017-6-22_9-47-58.png
     
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  10. Tools R Us

    Tools R Us

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    With the key to run, is there power at the B+ term in the diagnosis connector?
     
  11. unwiredadventures

    unwiredadventures www.unwiredadventures.com

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    Is that the OBD2 connector? If so, tested and it has power
     
    Last edited: Jun 22, 2017
  12. Tools R Us

    Tools R Us

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    The black diagnosis connector, under the hood, on the firewall, passenger side.
     
  13. LandCruisinMy93

    LandCruisinMy93

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    Happens a lot on vehicles with a CPK (crankshaft position sensor) I believe the later model 80's have them, but I'm not positive. When they go dead they generally don't leave you with any warning, you just go out to a car that cranks but won't fire.
     
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  14. ccslider

    ccslider

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    Here is the flow chart for troubleshooting.

    Edit: Added the crank sensor check.
     

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  15. unwiredadventures

    unwiredadventures www.unwiredadventures.com

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    There is power at the B+ term!

    I'll check the crank sensor next.
     
  16. unwiredadventures

    unwiredadventures www.unwiredadventures.com

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    I've established the the ECM has power. Would a bad sensor cause the Check Engine light to NOT to illuminate? (ignition on)

    With ECM powered, what other conditions would cause the Check Engine light to NOT to illuminate? (ignition on)
     
  17. george_tlc

    george_tlc SILVER Star

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    CEL gets +12V from the 10A Gauge fuse via J1 junction connector. The ECM drives the other side of the CEL bulb to ground to light it up.

    So, verify +12V is getting to the bulb. Verify that the bulb is not blown...

    Given that the CEL is meant to light with engine not running and key moved to on position - it's a self check of the bulb, I doubt that any sensor malfuction would cause the CEL to not light. would be counterproductive.

    Fusible links are suspect even if you have measured with a meter and no actual load - there's no load versus things being on/running.

    cheers,
    george.
     
  18. unwiredadventures

    unwiredadventures www.unwiredadventures.com

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    I'll check the bulb.

    Fusible links are original. I'll swap in a new set and retry.

    Thank you
     
  19. FJ80SRT

    FJ80SRT

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    Did you ever figure out what was wrong with your FJ80?
     
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