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Part#165903 Secondary Air Pump

Discussion in '456/550/575' started by paulchua, Apr 23, 2020.

  1. paulchua

    paulchua Cat Herder
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    Paul Chua
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  3. wbklink

    wbklink F1 Rookie

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  4. brogenville

    brogenville Formula Junior
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    At that price, it would be worth taking one along to an auto electrician. There’s still guys out there rebuilding alternators and starter motors. An air pump can’t be that hard to fix.


    Sent from my iPhone using FerrariChat.com mobile app
     
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  5. ferraridriver

    ferraridriver F1 Rookie
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    Paul, exactly what is wrong with yours?
     
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  6. Qavion

    Qavion F1 Rookie
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    It 'stopped working" according to Paul on the 348/355 forum. Hopefully he will add some more information...

    https://www.ferrarichat.com/forum/threads/part-165903-secondary-air-pump.620726/

    Unfortunately, I didn't realise Paul has a 456M GTA, and may have offered the wrong advice on the 348/355 Forum. For the 456M, the pump could be stopped by:

    Faulty fuse "8"? (although that also powers the oil radiator fan)
    Air Pump Relay "V"?
    No signal from the RH Motronics ECU?

    Having said that, I'm having trouble matching the wiring diagrams to the WSM text:

    The ECU activates the secondary air relay when the necessary conditions occur*. The relay is connected to the secondary air pump and parallel to the secondary air solenoid valve.

    *
    The pump is activated in the following conditions:

    - during the catalytic converter warm up period
    - when the lambda adjustment isn't active because it has been disconnected or damaged and the sensor isn't yet up to operating temperature
    - when the coolant temperature is too low, after starting the engine at cold.

    Since the pump and secondary air solenoid "plumbing" are not in parallel, I assume they are talking about the electrics. However, the pump relay seems to be controlled by the RH Motronics ECU and the valve by the LH Motronics ECU.

    Ferrari_456_Engine_Service_&_HVAC Wiring Diagram

     
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  8. asgor

    asgor Formula Junior
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    It's a SPAL part. It may be worthwhile contacting SPAL USA, send them a pic of the part and see what they say. Maybe they can cross-reference it to another application.
     
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  9. niftyfivefifty

    niftyfivefifty Karting
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  10. ferraridriver

    ferraridriver F1 Rookie
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    It can also be "stopped" by an accumulation of plastic dust from the impeller rubbing against the case due to a failure of the thrust bearing or too close tolerances. The dust buildup simply jams the impeller. That part of the pump can be disassembled and cleaned out but the impeller will still rub against the case. The motor section including the thrust bearing is not "takeapartable" ;)
     
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  11. Qavion

    Qavion F1 Rookie
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    A gentleman on the 348/355 forum said he replaced one of the bearings with a radio controlled car (wheel?) bearing, so I guess it involved some more serious disassembly techniques. Perhaps removing rivets, etc. At that point, it becomes an effort vs cost issue.
     
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  13. paulchua

    paulchua Cat Herder
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    Hello friends, sorry for the late reply. It just stopped working - seized me thinks. As you all know, it's just for smog/emissions - so the car works fine otherwise, but I figure when I get a chance, I'll pop it out and fix/replace it. I will definitely make sure to report to the community what I do for resolution.

    Much thanks all.
     
  14. ferraridriver

    ferraridriver F1 Rookie
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    Paul, Did you get a DTC code, if so what was it?

    I'll take a look at it if you want when you have it out. It's a chore to get out on a 550, I don't know about a 456
     
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  15. paulchua

    paulchua Cat Herder
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    Hello Dave, thanks for your question. I don't know what a DTC code is. I just noticed it never turns on. I read it's common for this part to just stop working on other models as well.

    My plan is when I get off my lazy butt, I'll pop it out and do some 'having fun with electrical fans" session.

    For sure I will report back here to the community.

    I figure it will involve finding a similar electric motor and swapping it in.

    Cheers
     
  16. ferraridriver

    ferraridriver F1 Rookie
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    DTC = Diagnostic Trouble Code
    I will bet the impeller is jammed in its chamber due to debris from impeller rubbing on case.
     
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  17. paulchua

    paulchua Cat Herder
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    Ahh!

    Does this show in the OBDII? If so, I don't recall seeing that. But I will be on the lookout.

    Much thanks for your time.
     

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