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P lock abnormal ok in hot weather

Discussion in 'Gen 2 Prius Main Forum' started by franken1313, Mar 17, 2018.

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  1. franken1313

    franken1313 Member

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    I've been getting the P lock error in my Gen 2 for a while now but for whatever reason the car is perfectly fine in the blistering heat. Does anyone know why?
     
    #1 franken1313, Mar 17, 2018
  2. bisco

    bisco cookie crumbler

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    other than a weak 12v, i haven't got a clue.
     
    #2 bisco, Mar 17, 2018
  3. franken1313

    franken1313 Member

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    No the 12v is fine I've replaced it many times thinking I keep buying defective 12v batteries
     
    #3 franken1313, Mar 17, 2018
  4. franken1313

    franken1313 Member

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    I replaced the transmission ecu and shift actuator
    I still have the P Lock problem..
     
    #4 franken1313, Mar 26, 2018
  5. bisco

    bisco cookie crumbler

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    unfortunately, if you read the p lock threads, it is vexing even to toyota. some think a wiring issue, perhaps rodents.
     
    #5 bisco, Mar 26, 2018
  6. franken1313

    franken1313 Member

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    So most likely replace the wiring harness?
     
    #6 franken1313, Mar 26, 2018
  7. bisco

    bisco cookie crumbler

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    i wouldn't want to recommend that unless it is determined to be the problem. it's a uge job.
     
    #7 bisco, Mar 26, 2018
  8. franken1313

    franken1313 Member

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    Is there a way around this? I've accepted the fact that this car is dead. So Now I'm wondering if it's possible to rip everything prius out and say put a ford transmission and engine in it and just not have a hybrid anymore. It sounds like more $ to do this but now I'm looking at it as a hobby project
     
    #8 franken1313, Mar 29, 2018
  9. bisco

    bisco cookie crumbler

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    almost impossible. if you could do that, you could replace the wiring harness.
     
    #9 bisco, Mar 30, 2018
  10. franken1313

    franken1313 Member

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    What wiring harness is it exactly? What do I Google? Is it this one? Screenshot_2018-03-30-20-59-50.jpg
     
    #10 franken1313, Mar 30, 2018
  11. Elektroingenieur

    Elektroingenieur Senior Member

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    Assuming the symptom is DTC C2300 (ACT System Malfunction), with no other DTCs, the Repair Manual says to check connectors T4 and S1, the P CON MTR fuse, the P CON relay, and the wires connecting them. Is this the problem on your car, and have you done the step-by-step voltage, resistance, and other checks specified in the manual, preferably while the symptom exists?

    Glancing at the Electrical Wiring Diagram, I believe the wire harnesses involved are the Engine Wire and the Engine Room Main Wire, but I wouldn’t replace either of these before doing the checks described in the Repair Manual. If the problem is intermittent and temperature-dependent, it might well be a defective connector housing, terminal, fuse socket, relay socket, or relay; perhaps some metal part is changing shape as it warms and cools and not making a good contact.

    If you find a problem, you might be able to make a repair, rather than changing the harness; see Toyota’s Wire Harness Repair Manual (PDF) for details.
     
    #11 Elektroingenieur, Mar 30, 2018
  12. franken1313

    franken1313 Member

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    Yes I have that code C2300 Actuator system malfunction plus
    P3102 Transmission control ecu. I replaced the transmission ecu and the shift accuator.
     
    #12 franken1313, Mar 31, 2018
  13. Elektroingenieur

    Elektroingenieur Senior Member

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    DTC P3102 should always be reported with a three-digit INF (information) code. Which one do you have?
    As @ChapmanF suggested to you in October, have you done the step-by-step troubleshooting procedures in the Repair Manual for the two DTCs?

    Also, see the hints at the start of the Diagnostic Trouble Code Chart pages in the Electronic Shift Lever System section, about C2300 and P3102 being detected together and the P CON MAIN fuse.
     
    #13 Elektroingenieur, Mar 31, 2018
  14. franken1313

    franken1313 Member

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    I don't see an information code 20180331_125216.jpg
     
    #14 franken1313, Mar 31, 2018
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  15. Raytheeagle

    Raytheeagle Senior Member

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    The INF codes can be read with Techstream software ;).

    Your scanner may not (or now appears will not) be able to glean the codes:(.
     
    #15 Raytheeagle, Mar 31, 2018
  16. Elektroingenieur

    Elektroingenieur Senior Member

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    As @Raytheeagle notes, a third-party scan tool may not be able to collect all of the information available with a Toyota Techstream diagnostic system, or even Toyota’s older Intelligent Tester unit.

    Before getting a different scan tool, though, I’d suggest doing the troubleshooting procedures, starting with the one for C2300.
     
    #16 Elektroingenieur, Mar 31, 2018
  17. franken1313

    franken1313 Member

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    Is this it?
    Screenshot_2018-03-31-13-08-23.jpg
     
    #17 franken1313, Mar 31, 2018
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  18. Raytheeagle

    Raytheeagle Senior Member

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    That’s the cable ;).

    You got an old laptop to run it:whistle:?
     
    #18 Raytheeagle, Mar 31, 2018
  19. franken1313

    franken1313 Member

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    Only one with windows 8
     
    #19 franken1313, Mar 31, 2018
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  20. franken1313

    franken1313 Member

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    I'm just scared of human error. I'd rather let a scanner tell me what to do. It just seems easier and less of a headache.
     
    #20 franken1313, Mar 31, 2018
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