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Thread: BCU, ECU & TCU for 4.6 from USA

  1. 21st May 2016, 05:47 AM #41
    Battler
    Battler is offline Master Supporter
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    Thanks again Sierrafery,

    Makes sense to me now.

    The truck runs really great with the 4.6 ECU. The only issue is it runs open loop constantly and the fuel consumption is around 10mpg around town. I normally get around 13mpg.

    It might be because I have only pre cat O2s and not the 4?
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  2. 21st May 2016, 06:25 AM #42
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    sierrafery
    sierrafery is offline YarnMaster Silver Subscriber
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    Unfortunately this is above my knowledge... if the problem is caused by the missing SAI this relay trick should help if it's for some other reason i'm lost
    Discovery Td5 (2000), manual, tuned
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  3. 21st May 2016, 06:58 AM #43
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    Pedro_The_Swift
    Pedro_The_Swift is offline The MOD Father
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    I'm sure the ECM is defaulting to some preset map without all 4 sensor readings,,

    yea, I think the biggest improvement is the 4.6 fuel map,, not the 4.6 crank.
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
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    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

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  4. 21st May 2016, 07:14 AM #44
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    Pedro_The_Swift
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    Hmm, I think the ECM uses the Pre and Post sensors to compare oxygen after the Cat has done its job,, no Post sensor reading will cause a default fuel map regardless of SAI pumps.
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  5. 21st May 2016, 08:11 AM #45
    Battler
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    I thought the pre cat does the fuel trim and the post cat confirms the cat is working.

    Funny thing is I'm not getting O2 codes.
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  6. 21st May 2016, 12:55 PM #46
    Battler
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    Hmmm, no Black/Orange wire coming out of that plug. I can see it in RAVE 0636 and I've got the right plug; very difficult to locate pin 16.
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  7. 21st May 2016, 01:07 PM #47
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    sierrafery
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    It might be a difference between NAS and other harnesses then if pin 16 is empty.... the pin disposals are shown in the connector view, third from right in the bottom second row ... red in the pic
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    Discovery Td5 (2000), manual, tuned
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  8. 21st May 2016, 01:09 PM #48
    Battler
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    Ok, after further investigation; that wire is only on vehicles with SAI.

    RAVE: 16 BO 18. 16 is the pin, BO is black orange and 18 stands for SAI.
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  9. 21st May 2016, 01:11 PM #49
    Battler
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    Quote Originally Posted by sierrafery View Post
    It might be a difference between NAS and other harnesses then if pin 16 is empty.... the pin disposals are shown in the connector view, third from right in the bottom second row ... red in the pic
    I'll have look.

    Is it possible to pull the plug apart? I can't really see how else I can get a wire in there.
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  10. 21st May 2016, 01:13 PM #50
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    sierrafery
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    That's the description but in reality it's possible to be a wire there but if the pin in the connector is empty improvise and insert a wire through the cavitie as to touch the ECU's pin when you plug it, it's possible with a thin wire
    Discovery Td5 (2000), manual, tuned
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