Looking for wiring diagram for Secondary air pump on an 88 Testarossa | FerrariChat

Looking for wiring diagram for Secondary air pump on an 88 Testarossa

Discussion in 'Technical Q&A' started by Mattroot, Jun 5, 2023.

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  1. Mattroot

    Mattroot Rookie

    Sep 20, 2022
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    Matthew R
    In the past someone broke the plastic connector to the air pump and the wires were just dangling, would explain the odd idle too. lol

    I have a Violet (Z) and a Red (R) wire just want to attach them correctly while the Engine is currently out of the car on a table, thank you guys.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #2 Steve Magnusson, Jun 5, 2023
    Last edited: Jun 5, 2023
    Are you sure those aren't a ZN (purple-black) wire and a RN (red-black) wire? My guess would be that, functionally, the polarity doesn't matter as the coil of the electomagnetic clutch inside the air pump is isolated from everything else (and the direction of the magnetic flux that the coil generates won't matter either as it just attracts a steel component to engage), but just a guess (and I don't have a TR anymore to check ;)).

    You can download a pdf copy of the late US TR wiring diagram 509/88 here:

    https://www.dropbox.com/s/gne5xw608ba818b/509_88 US TR Wiring Diagram Book.PDF?dl=0

    Fig 3 has the air injection components (but it doesn't convey anything about the physical polarity of the air pump, 140, connections).
     
  3. Ferrari Tech

    Ferrari Tech Formula 3

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    Thanks Steve.
     
  4. Qavion

    Qavion F1 World Champ
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    #4 Qavion, Jun 5, 2023
    Last edited: Jun 5, 2023
    In colour....

    https://www.dropbox.com/t/JG6CKbDXYgGWfQpP

    See item #140

    But it still doesn't specify which wire goes to which pin on the pump.

    Isn't the pump powered by a DC electric motor? Wouldn't that mean the pump would go backwards, perhaps sucking instead of blowing :p

    Were you thinking of the secondary air solenoid valve?
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #5 Steve Magnusson, Jun 5, 2023
    Last edited: Jun 5, 2023
    No, on a TR (testarossa), the air injection pump is belt driven off of the crankshaft. The electrical signals only determine if the air pump EM clutch is engaged (which spins the air pump rotor) or not engaged (which does not).
     
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  6. Veedub00

    Veedub00 F1 Veteran
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    Air pump shouldn’t do anything to affect idle right? It just shoves air into your cats at start up. And doesn’t stay on very long either.
     
  7. Qavion

    Qavion F1 World Champ
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    Thanks, Steve. I'll update my diagram to show this.
     
  8. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Not warm idle, nor cold idle, if everything's working correctly.

    If the air injection system was wrongly "on" during warm idle (for some bizarre reason) = that would cause the O2 sensors to report a very lean value always to the KE-Jet injection ECUs.
     
  9. Veedub00

    Veedub00 F1 Veteran
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    Oh yeah. That’s right. If it fails in the on position somehow. I wonder if that’s even possible.
     
  10. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Wouldn't disagree that that would be rare, but I was thinking more along mechanical lines (e.g. the clutch gets mechanically locked up) rather than an electrical flaw (but that's not impossible).
     
  11. Mattroot

    Mattroot Rookie

    Sep 20, 2022
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    Thank you guys, I love the community here, didnt get right back because I got put on a 599 for a bit, had to pull the dash for recovering, not to bad if you take you time and bag and tag everything, now im pulling the intakes to change the engine cover gaskets (Valve cover gaskets. good to know the polarity doesnt matter, i didnt think it would but i wanted to verify before putting the engine back in the car, engine is back in as of last night, thank you all so much,
     
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