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ECU Code 21

Just done ECU diag as i have a misfire on centre cylinder of left bank and i get code 21.

 

what should i do next???

 

 

cheerz

 

zedhot:cry:

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    • Featured Replies

    Clean the connectors on the PTU, and if that doesn't work, buy a new one from the US. One bought in the UK will be very expensive and also the original design, which is known to fail, so a US one is preferable.

  • Quote

    Code 21 is an ignition circuit fault - mostly related to the PTU (Power Transistor Unit). As stated above, carefully remove the connector to the PTU and clean off any corrosion or oxidation to ensure a good, clean contact. Dave Marley is talking about purchasing a Series II PTU from Courtesy Nissan (http://www.courtesyparts.com/z32/index.html ). These are (a) newer and (b) of a new design to improve cooling efficiency (which is the main cause of PTU failure). Hopefully that will sort your problem.

     

    HTH

     

    Regards,

  • Quote
    • Author

    you are superstars!!!

    cleaned connections and now no missing. runs sweet as a nut

     

     

    cheerz guys

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    Excellent! To be honest I was expecting you to need a new PTU, but I'm glad I was wrong! :D

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