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Thread: No 5V reference. All sensors showing two grounds.

  1. #1

    Default No 5V reference. All sensors showing two grounds.

    So I bought a new chassis and Iím switching everything over to the new car. Best I can tell nothing is different. Only thing I can think of is I donít have all the extras hooked up because I wanted to get it to run before finalizing the wiring. Coolant & MAT read super high and still read when unplugged. A26 on J2 tests ground instead of 5V. All 5V sensors show two grounds when pinned out. Only the main harness is plugged in. I did have 12 volt wired in wrong at one point. Iím lost & sad.

  2. #2
    Join Date
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    Quote Originally Posted by T-1 View Post
    All 5V sensors show two grounds when pinned out. Only the main harness is plugged in.
    Read this entire thread: https://forums.holley.com/showthread...0200#post80200 (Related Forum Thread)

    I did have 12 volt wired in wrong at one point.
    I don't know if this has anything to do with it. Read "ECU Firmware Problems" below:

    EFI Software Problems:
    Often times, when EFI software related functions don't work properly, it's caused by a corrupted software download/installation.
    I suggest completely removing the Holley EFI software from the "Control Panel", "My Documents" (Holley folder) and the
    "C:Drive" (Program Files, Holley folder) and install a fresh EFI software download. Save your Global Folder somewhere.
    ECU Firmware Problems:
    Conversely, often times, when actual ECU related functions don't work properly, it's caused by a corrupted ECU firmware installation.
    As a last resort, you can try reflashing the ECU firmware version (LINK). The ECU firmware is in with the software download (LINK).
    Also, try completely disconnecting the battery for 20 minutes. This "resets" some unusual ECU issues.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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