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ecm issues.

Discussion in '1st Gen. Tacomas (1995-2004)' started by salvagehamilcar, Nov 28, 2015.

Page 3 of 4
  1. Dec 11, 2015 at 1:43 PM
    #41
    rzgkane

    #41
    rzgkane Well-Known Member

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    The Mazda incorrectly thought there was one thing wrong (high fluid temp) when in fact the problem something else (bad temp sensor).
     
    rzgkane, Dec 11, 2015
    #41
  2. Dec 11, 2015 at 1:59 PM
    #42
    Dirty Pool

    #42
    Dirty Pool FLIES ON THE FRIES, KETCHUPS WATERED DOWN

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    I was just about to ask if you were getting "not ready" or just nothing.
    The communication buss is functioning and not a bad connection (your getting data). Are you getting all the running data, closed loop, nothing missing? Values seem reasonable? Sure seems like it.
    I have not heard of any oddball Toyota specific conditions that enable or prevent a "ready" status. Not saying there aren't any but not to my knowledge.

    As long as the observed value, right or wrong, for coolant temp is over 176F, that's enough for closed loop it is also the default ECT set for fail safe mode.
    I concur about things pointing towards the ECU. I am not going that far out on a limb just yet but it might be time to start "casually" looking for an ECU to swap or maybe get a diagnostic read from another party with different equipment although both you and the emissions testers seem to be seeing the same thing. :confused:
     
    Dirty Pool, Dec 11, 2015
    #42
    Brie likes this.
  3. Dec 11, 2015 at 2:03 PM
    #43
    Dirty Pool

    #43
    Dirty Pool FLIES ON THE FRIES, KETCHUPS WATERED DOWN

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    59.4 Miles, 56.67° NE Of Moab
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    Dirty Pool rear bumper/air tank with integrated spare CV shaft storage, DP customized TJM front bumper, 8000 lb Ramsey/Technora rope, E-locked, Extended breathers with front diff catch can, PCV catch can, SAWs with DP heim joint seals, DP custom 6 leaf rear springs/Billies, DP custom skids, 2lo, Gray wire, Cap, Bed Rug, Black steelies, 01 Center console, Map lights, Disraeli gears
    Speed sensor working? It seems as if what ever the problem is, it's across the board with the monitors.
     
    Dirty Pool, Dec 11, 2015
    #43
  4. Dec 11, 2015 at 3:43 PM
    #44
    salvagehamilcar

    #44
    salvagehamilcar [OP] Active Member

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    My original question was with respect to my monitors not being ready. But in doing some research and some tests I found the odd ecm symptoms.
     
    salvagehamilcar, Dec 11, 2015
    #44
  5. Dec 11, 2015 at 3:45 PM
    #45
    salvagehamilcar

    #45
    salvagehamilcar [OP] Active Member

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    I don't see what else it could be. How can just one part of the ecu be bad?
     
    salvagehamilcar, Dec 11, 2015
    #45
  6. Dec 11, 2015 at 4:07 PM
    #46
    billybob50

    #46
    billybob50 Well-Known Member

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    billybob50, Dec 11, 2015
    #46
  7. Dec 11, 2015 at 4:19 PM
    #47
    salvagehamilcar

    #47
    salvagehamilcar [OP] Active Member

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    What kind of values should I be looking at?
     
    salvagehamilcar, Dec 11, 2015
    #47
  8. Dec 11, 2015 at 4:19 PM
    #48
    salvagehamilcar

    #48
    salvagehamilcar [OP] Active Member

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    I'll take it apart tomorrow morning.
     
    salvagehamilcar, Dec 11, 2015
    #48
  9. Dec 11, 2015 at 5:26 PM
    #49
    billybob50

    #49
    billybob50 Well-Known Member

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    billybob50, Dec 11, 2015
    #49
    Brie likes this.
  10. Dec 12, 2015 at 11:02 AM
    #50
    Dirty Pool

    #50
    Dirty Pool FLIES ON THE FRIES, KETCHUPS WATERED DOWN

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    I think my point was missed. The ECM is seeing an acceptable number from the temp sensor to allow closed loop and readiness tests. It could be off but it matters not as far as the OP's suspected problems with the ECU are concerned. The ECU is seeing a reasonable temp value (right or wrong) and that's all that matters. I would keep looking.


    The ECU is made up of numerous circuits/circuit systems. Some are electrically entwined some are not. It is entirely logical that one single failure in an internal ECU circuit/circuit component dealing with trouble codes/readiness tests/drive cycles may not have any effect on the actual running of the engine.

    What engine is this?
     
    Dirty Pool, Dec 12, 2015
    #50
    Brie likes this.
  11. Dec 12, 2015 at 11:28 AM
    #51
    salvagehamilcar

    #51
    salvagehamilcar [OP] Active Member

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    The engine is a 3.4l v6 in a 01 Tacoma manual, 4x4.
     
    salvagehamilcar, Dec 12, 2015
    #51
  12. Dec 12, 2015 at 11:28 AM
    #52
    billybob50

    #52
    billybob50 Well-Known Member

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    Are you the original owner? Could the previous owner had altered the ECM, wonder if you can get it re flashed or purchase a replacement?
     
    billybob50, Dec 12, 2015
    #52
  13. Dec 12, 2015 at 11:34 AM
    #53
    salvagehamilcar

    #53
    salvagehamilcar [OP] Active Member

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    I am not the original owner. I don't think so, when I looked behind the glove box for the ecm everything looked undisturbed. No screws or bolts missing/rounded off. I'm looking to see if a shop or the dealer will reflash it for me. But I think I hit a dead end.
    BTW I tested the coolant temperature sensor using the chart provided by Billybob50 value were spot on. Sensor is fine.
     
    salvagehamilcar, Dec 12, 2015
    #53
  14. Dec 12, 2015 at 11:42 AM
    #54
    billybob50

    #54
    billybob50 Well-Known Member

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    If the previous owner had it reprogrammed, all is needed is a cable and computer to do the work. This is probably your problem since it doesn't recognize some of your sensors.
     
    billybob50, Dec 12, 2015
    #54
  15. Dec 12, 2015 at 12:02 PM
    #55
    Dirty Pool

    #55
    Dirty Pool FLIES ON THE FRIES, KETCHUPS WATERED DOWN

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    59.4 Miles, 56.67° NE Of Moab
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    Dirty Pool rear bumper/air tank with integrated spare CV shaft storage, DP customized TJM front bumper, 8000 lb Ramsey/Technora rope, E-locked, Extended breathers with front diff catch can, PCV catch can, SAWs with DP heim joint seals, DP custom 6 leaf rear springs/Billies, DP custom skids, 2lo, Gray wire, Cap, Bed Rug, Black steelies, 01 Center console, Map lights, Disraeli gears
    No flashy for 1st gens.
     
    Dirty Pool, Dec 12, 2015
    #55
  16. Dec 12, 2015 at 12:06 PM
    #56
    salvagehamilcar

    #56
    salvagehamilcar [OP] Active Member

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    Lol great.
     
    salvagehamilcar, Dec 12, 2015
    #56
  17. Dec 12, 2015 at 12:24 PM
    #57
    Dirty Pool

    #57
    Dirty Pool FLIES ON THE FRIES, KETCHUPS WATERED DOWN

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    59.4 Miles, 56.67° NE Of Moab
    Vehicle:
    99 XCAB V6 MT TRD
    Dirty Pool rear bumper/air tank with integrated spare CV shaft storage, DP customized TJM front bumper, 8000 lb Ramsey/Technora rope, E-locked, Extended breathers with front diff catch can, PCV catch can, SAWs with DP heim joint seals, DP custom 6 leaf rear springs/Billies, DP custom skids, 2lo, Gray wire, Cap, Bed Rug, Black steelies, 01 Center console, Map lights, Disraeli gears
    I feel your pain. You have a sucky situation and mostly all just to pass a test.
     
    Dirty Pool, Dec 12, 2015
    #57
  18. Dec 12, 2015 at 12:31 PM
    #58
    billybob50

    #58
    billybob50 Well-Known Member

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    billybob50, Dec 12, 2015
    #58
    Brie likes this.
  19. Sep 16, 2016 at 10:37 PM
    #59
    Brie

    #59
    Brie Well-Known Member

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    What's this mean?
    They can't be flashed?
     
    Brie, Sep 16, 2016
    #59
    Lord Helmet likes this.
  20. Sep 20, 2016 at 8:11 PM
    #60
    Lord Helmet

    #60
    Lord Helmet Prepare To Attack

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    Lord Helmet, Sep 20, 2016
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