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Thread: Wiring 554-102 fuel pressure transducer?

  1. #1

    Default Wiring 554-102 fuel pressure transducer?

    Working with Holley HP EFI and adding fuel pressure transducer. Previous owner used only an analog gauge and did not have fuel pressure wired to ECU. How do I wire the 554-102 transducer to the ECU/harness? Hoping there is a link with good instructions. Thank you.

  2. #2
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    The fuel & oil pressure transducers are "plug & play" into the HP/Dominator EFI main harness. And they don't consume any Custom I/O either.
    Look at the wiring schematics and the main harness drawings in Section 13, Wiring Appendix:
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Section 13, Wiring Appendix)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

  3. #3

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    Danny: I'm getting into this project today and noticed that the existing setup has an Auto Meter 2246 transducer already being used. Can I simply splice the existing Auto Meter signal wire into the ECU Harness? Will the transducer allow for two "devices" (existing Auto Meter fuel pressure gauge AND ECU?

  4. #4
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    Quote Originally Posted by jb427 View Post
    Can I simply splice the existing Auto Meter signal wire into the ECU Harness?
    Yes, you may even be able to connect the Holley EFI fuel pressure harness connector to the Auto Meter transducer. If it's not a 100 or 200 psi transducer, then program the Calibration Curve in the Sensors ICF.

    Will the transducer allow for two "devices" (existing Auto Meter fuel pressure gauge AND ECU?
    Yes, RPM & 0-5V signals (3-wire) can be split to two devices. (Thermistor (2-wire) type sensors send a variable resistance measured in Ohms. This signal type can not be shared by two devices.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

  5. #5

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    Last question I hope. The way the car is wired, it'll be easier to splice into the signal wire off the Auto Meter harness. My question is, do I then need to splice into the wire feeding Pin A31? Or do I simply put a terminal on the end of the new spliced wire and use this wire instead of the existing wire feeding A31?

  6. #6
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    Yes, that should be fine, as long as the Auto Meter transducer is the same as what's selected in the Sensors ICF.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

  7. #7

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    I'm using Auto Meters #2246 transducer (0-100 psi). The only option I have in the Fuel Pressure Sensor drop down is Holley 100 psig SS & Custom. Should there be others?

    I'm currently not getting a reading from the ECU, just the LOW Err. I spliced into Auto Meter's signal wire, ran a new 22 gauge wire to the ECU, removing the existing purple wire in A31.

  8. #8
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    Quote Originally Posted by jb427 View Post
    I'm using Auto Meters #2246 transducer (0-100 psi). The only option I have in the Fuel Pressure Sensor drop down is Holley 100 psig SS & Custom. Should there be others?
    Yes, Holley 100 PSIG SS would be correct.

    I'm currently not getting a reading from the ECU, just the LOW Err. I spliced into Auto Meter's signal wire, ran a new 22 gauge wire to the ECU, removing the existing purple wire in A31.
    I don't know why it's not working. The EFI software, ECU pin J1A-A31 is just reading for a 0-5V signal.

    The Holley EFI 554-102 sensor has a linear voltage output range of .5 - 4.5 volts (0-100 psi).
    Volts - PSI
    0.50 = 0
    0.77 = 7
    1.03 = 13
    1.30 = 20
    1.57 = 27
    1.83 = 33
    2.10 = 40
    2.37 = 47
    2.63 = 53
    2.90 = 60
    3.17 = 67
    3.43 = 73
    3.70 = 80
    3.97 = 87
    4.23 = 93
    4.50 = 100
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

  9. #9

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    So if I put a multimeter on the pin side of the wire, I should get a reading of approx 2.10V for 43 psi? How many volts would show when the fuel pump is not running and the ignition switch is on?

  10. #10
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    Quote Originally Posted by jb427 View Post
    So if I put a multimeter on the pin side of the wire, I should get a reading of approx 2.10V for 43 psi?
    Yes, approximately 2.20V for 43 psi.

    How many volts would show when the fuel pump is not running and the ignition switch is on?
    See post #8. Zero psi would be 0.05V. However, if the fuel pump just primed the fuel system, you may not actually have zero psi as it bleeds down to zero psi. So I'd relieve fuel system pressure if you're unsure.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

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