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348 348 ecu error 4121 and ccu delete

Discussion in '348/355' started by jlclt348, May 7, 2023.

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  1. jlclt348

    jlclt348 Karting

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    Justin
    #26 jlclt348, May 14, 2023
    Hi, all... busy work week, but in garage today. Turns out the cat control unit error is a red herring. Worth following up in, but not causing the 5-8 cel or the engine stumble. I swapped the units and there is no change in engine behavior. Next up I'll test the crank position sensors. Thanks for your help so far!
     
  2. jlclt348

    jlclt348 Karting

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    #27 jlclt348, May 14, 2023
    Can someone please point me to the location of the cam position sensors?
     
  3. yelcab

    yelcab F1 World Champ
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    #28 yelcab, May 14, 2023
    Rear of heads, on the intake cam. Depending on the year, you may have one or two of them.
     
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  4. jlclt348

    jlclt348 Karting

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    #29 jlclt348, May 14, 2023
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  5. Qavion

    Qavion F1 World Champ
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    #30 Qavion, May 14, 2023
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  6. yelcab

    yelcab F1 World Champ
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    #31 yelcab, May 14, 2023
    Yes, that is it. The 94 model has only one cam sensor whose signal is shared with both sides.
     
  7. jlclt348

    jlclt348 Karting

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    #32 jlclt348, May 15, 2023
    Ok, thanks. I was confused why there was only one. My axle boot broke last summer and sprayed axle grease all over the engine. It looks like this sensor was in the line of fire. And the CEL started last summer too. So next up I'll clean up that whole area and the connectors
     
  8. Ferrarium

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    #33 Ferrarium, May 15, 2023
    It would be really hard for gears to get into that connection.
     
  9. yelcab

    yelcab F1 World Champ
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    #34 yelcab, May 15, 2023
    There is only one Cam position sensor running off bank 1 which ECU1 reads directly. The signal is shared with ECU2 which has to "assume" that you have done cam timing correctly on both banks so that the relative position of bank 2 camshaft can be accurately inferred by using the signal from bank 1 camshaft.
     
  10. jlclt348

    jlclt348 Karting

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    #35 jlclt348, May 15, 2023
    Appreciate the input guys. Is the data from the crank position sensors "shared" the same way?
     
  11. Qavion

    Qavion F1 World Champ
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    #36 Qavion, May 15, 2023
    Justin, here are wiring diagram for the 2.5 and 2.7. It shows wires going directly from the Cam Sensor to both ECUs. The cam sensor plug only has 3 wires, but the signal wiring is pigtailed. See bottom right of diagrams:

    2.5 wiring diagram:

    https://www.dropbox.com/t/WzfvT3X2Yv0TZdpq

    2.7 wiring

    https://www.dropbox.com/t/03t7tmxlkzamFsE7

    The Right ECU, however, does provide power to the Cam Sensor.

    Each bank has its own crank sensor. No sharing.
     
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  12. Ferrarium

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    #37 Ferrarium, May 15, 2023
    Crank sensors.

    [​IMG]
     
  13. m.stojanovic

    m.stojanovic F1 Rookie
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    #38 m.stojanovic, May 16, 2023
    It is unlikely that the problem is in the cam position sensor since the CEL appears on one bank only. The crank sensor, maybe.

    Another possibility is the fuel pump pressure. I once had a problem with one of my fuel pumps - at the start from cold, it would provide normal pressure (I have fuel pressure gauges installed, see pic) but, after a few minutes of idling, the pressure would start slowly going down and this caused CEL for that bank when the pressure dropped to about 70-80 % of normal.

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  14. jlclt348

    jlclt348 Karting

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    #39 jlclt348, Jun 2, 2023
    Thanks to all your input i finally got out there today and determined it is the crank sensors. Specifically the connectors. The sensors are fine and she runs smoothly now.

    I removed all the protective plates. Everything looks fine in visual inspection (first pic) but the connectors absolutely disintegrated in my fingers when I tried to undo them.

    I put everything back in the temp configuration you can see in the second pic. Shes idles smoothly. No stumble. No CEL.

    Tomorrow I will tape the f**k out of it until I can get new connectors and re-pin everything.

    What are connectors of this type called?

    Thanks again for your guidance. I'm not very experienced but this was a fun one!
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  15. Ferrarium

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    #40 Ferrarium, Jun 2, 2023
  16. jlclt348

    jlclt348 Karting

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    #41 jlclt348, Jun 14, 2023
    Declared victory too soon! The CEL came back so I ordered new crank sensors from Ricambi.
    The 1-4 sensor was super easy to swap out.
    But how in the world do you get at the bolt for the 5-8 sensor?
    I don't want to take the belt off, but I don't see any other way to do it.
    Any ideas?
     
  17. Ferrarium

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    #42 Ferrarium, Jun 14, 2023
    I remove the passenger wheel tub and get to it through the wheel well with a long extension and a swivel, super easy.

    Sent from my SM-G990U using FerrariChat.com mobile app
     
  18. jlclt348

    jlclt348 Karting

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    #43 jlclt348, Jun 14, 2023
    Does your car have AC? It looks like the compressor would get in the way of doing what you described.
     
  19. Ferrarium

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    #44 Ferrarium, Jun 14, 2023
    Yep I have ac, you can get in there fine I used 1/4 ratchet with long extension and a swivel, need swivel. Have to contort a bit but it's straight forward. Reach is from above the ac going downward.

    I actually have a picture out here somewhere if it.

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  20. jlclt348

    jlclt348 Karting

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    #45 jlclt348, Jun 14, 2023
    A pic would be great. I can't see it for myself.
     
  21. Ferrarium

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    #46 Ferrarium, Jun 14, 2023
    Not sure where it is actually. My tub is out maybe I'll take a pic tonight.

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  22. Ferrarium

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    #47 Ferrarium, Jun 14, 2023
    I think you missed the part where you have to remove the fiberglass wheel liner/tub.
    The whole engine is visible then including the crank sensors.

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  23. jlclt348

    jlclt348 Karting

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    #48 jlclt348, Jun 14, 2023
    Ok wheel and liner off. I can't really see it clearly but I thinks its down there under that coolant line. Def not "easy" to get to. At least not for a rookie
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  24. Ferrarium

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    #49 Ferrarium, Jun 14, 2023
    2 foot extension, swivel and another small extension. Push it through, go under the car and set socket it on the nut. Once it's on and you have light from above you'll see it, take it on or off with the ratchet.

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  25. Ferrarium

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    #50 Ferrarium, Jun 15, 2023
    Remember you only need to break it loose, you can then remove the bolt with your fingers. When putting it back on use fingers then the same process to simply snug the bolt down where the belts are otherwise in the way.
     
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