Z32 PTU series 2

Discussion in 'Technical' started by Daryl-n-Mary, Oct 19, 2020.

  1. Daryl-n-Mary

    Daryl-n-Mary New Member

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    Good morning,
    Have been reading posts on this forum about splicing in the series 2 PTU, and understood all the content provided by Vadar and other members, on our install on the weekend on first crank of the engine PTU went extremely hot and engine wouldn't crank, so we stopped, I have double/triple checked all colour wires match ups and pretty confident all in right place. but because we haven't changed anything we are assuming car wont crank and PTU will get hot again so don't want to repeat process until I understand what might be happening.

    The series 2 PTU was purchased second hand and only assumed it was a working unit as no paperwork came with it, not sure if they can be verified as a working unit or I can test at home.

    Any suggestions, appreciated.

    Mary :)

    Background we purchased our 90 TT 2+2 5 years ago, spent lots of time and $$ getting her back to her former glory, original PTU started mucking up so thought we would do the swap over, wanted to buy new plug and drive system, unable to find in stock so went for the second hand unit and had to splice it in to original wiring loom, 80% sure I followed wiring diagram.
     
  2. Daryl-n-Mary

    Daryl-n-Mary New Member

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    Daryl has just wanted me to add - prior to Saturday he did attempt to wire it up himself and got it all in reverse, he tried to start car and it would not even try to crank, then I came in with all the wiring charts on weekend and mapped out layout for him - could he have fried the ptu prior to Saturday install
     
  3. Daryl-n-Mary

    Daryl-n-Mary New Member

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    If suggestions say get another series 2 PTU and start again, can I get suggestion where best to source from, would love a new one :)
     
  4. Martin Williams

    Martin Williams Well-Known Member

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    When you say it wont crank, you mean the engine wont turnover on starter motor? PTU should not get hot but even then the engine should turnover.
     
  5. NI85

    NI85 Member

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    Location:
    Sydney
    https://www.carcraze.com.au/ignition-control/ currently seems to have a second hand one.
    -----
    If you don't mind eBay.
    eBay item number: 111412599484 <- type in to eBay search bar
    Original Quality Ignition Module to suit R33 and Z32 models (please refer applications below)
    - Brand New Part - 3 Year Warranty
     
  6. zx299

    zx299 Well-Known Member

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    As MW said in his reply, the PTU plays NO part in your cranking process. Check battery, fuses etc

    With the S1 to S2 PTU conversion you must ensure the Ground wire, which is the last wire on the S1 7 pin connector, is switched over to become the middle wire on the S2 7 pin connector on the opposite side of the PTU

    The S1 to S2 PTU conversion is not some sort of magic elixir. Back in the early days they had some problems with S1 PTU reliability in the US (obviously a quality control problem with the manufacturer) as a lot of them were breaking down. Nissan USA decided the easiest solution was to do a S1 to S2 swap.

    Japanese 300zx‘s did not seem to be plagued by the same dilemma, and many zeds were still running S1 PTU’s without problem for decades. Age started to effect the PTU’s (as with any electronic component) and failures started to occur ……so a lot of people fitted the S2 PTU as a replacement because that’s what the yanks did
     
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  7. MickW

    MickW Carntry member...

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    I had a similar problem when replacing an S1 PTU with an S2 on a mate's car. One wire out of place and I nearly cooked the new PTU. I had successfully done the job on my own car so I should have known better.
    ( The new PTU survived but I swapped my un-molested PTU into his car and put his molested PTU in my Zed. Still going after 20,000 km's )
     
  8. MickW

    MickW Carntry member...

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    Depends how long he left it wired up arse-about with the ignition on. See my reply to zx299 above. I wired one up wrong but I could smell it overheating fairly soon because indoors / no wind blowing. Maybe 1.5 minutes tops??
    Good luck. The wiring on these cars is the biggest challenge...
     

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