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Thread: U1016

  1. #11
    Lifetime Member hquick's Avatar
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    On one of the places I found that info it specifically mentioned the grounds on the backs of the heads.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  2. #12
    Joe (Moderator) joecar's Avatar
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    If you removed the bracket for the AIR inverter valve during the injector swap, then there's a good chance one or both grounds on the rear of the LHS side came loose (G110, G112).

  3. #13
    Lifetime Member mr.prick's Avatar
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    all grounds that i could reach where good,
    the alternator power wire was loose so i tightened it
    and still it just cranks but won`t start.
    the fuel pump reprimes after i stop cranking.
    the instrument panel "surged" once. (needles spiked)
    and i got a few more codes.

    P1626
    P1637
    C0239
    C0240
    U1016
    and some voltage measurements i took at the BCM.

    Pin Wire Color Circuit No. Function

    C2-----PPL/WHT-----1074 Ignition Key Resistor Return .12ohms @20k
    D5-----PNK-----39 Ignition Positive Voltage 10.8 volts (the battery was a little low)
    D6-----YEL-----43 Program Input 10.9 volts
    D7-----WHT/BLK-----1073 Ignition Key Resistor Feed 10.2 volts
    D8-----DK BLU-----229 Fuel Enable 2.6 volts <<<<<< problem

    there is something up with the fuel enable voltage.
    i`m supposed to check for an open or a short.
    LOL i don`t know how to do this yet
    i still suspect a bad BCM, tho i don`t know how to explain recovering from
    this 2 other times before.
    i can`t retrieve the PCM calibration details. (ctrl+alt+pg up)

    i should mention that there have been a few times in the past,
    while driving down the road the car would out of the blue go super lean and sputter.
    after pulling over and restarting all was well.
    Last edited by mr.prick; September 2nd, 2008 at 02:34 PM.

  4. #14
    Lifetime Member mr.prick's Avatar
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    new battery reads 12.4volts
    the fuel pump enable is 5volts (unhooked from BCM)
    VATS and reduced power mode are still inactive
    the stock PCM is not connecting.
    the STAR, PCM, and BCM connectors looked good (no loose wires)
    would a bad module other than the PCM keep flashscan from connecting?
    are the any specific areas within the class 2 serial data circuit
    that tend to fail i should look at or "easy" tests?
    Last edited by mr.prick; September 3rd, 2008 at 12:39 PM.

  5. #15
    Joe (Moderator) joecar's Avatar
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    Start at BATT.GIF and follow the letters...

    I assumed 01 F-body, I think 99, 00 may be the same as 01, 02... let me know if you want 99 or 00.
    Attached Files Attached Files

  6. #16
    Lifetime Member mr.prick's Avatar
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    thanks. (2002)
    this seems to be beyond my simple mind. LOL
    why can i connect and log, read/clear DTC`s but
    not download/upload to the stock PCM?
    i guess those are different types of connections.
    my new battery is 12.3volts, flashscan reads 11.8volts.
    are all wires connected to the class 2 serial data circuit?
    could an open anywhere in the car do this?

  7. #17
    Joe (Moderator) joecar's Avatar
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    Yes, scanning, logging, reading, flashing all use the same wire.


    PCM reports 11.8V to scantool, but measurement across battery shows 12.3V...

    This means the PCM power/ground circuits are dropping 0.5V... this is bad.


    Key off, disconnect PCM connectors;
    Key on;

    Place DMM - probe on battery negative terminal;
    with DMM + probe, check voltage on power pins in connector;
    expect to see battery volts, if not, probe upstream on power circuit(s);

    Place DMM + probe on battery positive terminal;
    with DMM - probe, check voltage on ground pins inconnector;
    expect to see battery volts, if not, probe downstream on ground circuit(s).

    Extract the files from the attachment before viewing (to see the connector images).
    Attached Files Attached Files
    Last edited by joecar; September 5th, 2008 at 02:31 AM.

  8. #18
    Joe (Moderator) joecar's Avatar
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    I edited my post.

  9. #19
    Lifetime Member Biggsy's Avatar
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    Quote Originally Posted by mr.prick View Post
    my new battery is 12.3volts, flashscan reads 11.8volts.
    This seems to be normal, it does the same on my car.
    Dave.

  10. #20
    Joe (Moderator) joecar's Avatar
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    Oh, it does...?! ...I'll go log mine.

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