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fuel pump low/high voltage transition table

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Old Jan 14, 2012, 01:37 PM
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fuel pump low/high voltage transition table
I posted it in another thread, but its buried pretty deep, so I'm starting a new thread. I found the table that controls the transition between low and high voltage for the fuel pump. This will likely end up being very useful for the Walbro 400. So far, I've only found it for the 88590015 ROM as shown below. Post up requests for other ROMs, and I will dig them up as requested.

NOTE: This only works on factory fuel pump wiring or on a rewire that preserves a low/high voltage power arrangement such as:

https://www.evolutionm.net/forums/ev...e-circuit.html

January 14 Update
Someone asked if there was a hysteresis value. There is, but I had figured that nobody cared, so I previously omitted it. I have included it now.

Here is the entry for EvoScan to log the status:

Code:
<DataListItem DataLog="Y" Color="" Display="Fuel Pump Low Voltage Status" LogReference="FuelPumpLowVoltageStatus" RequestID="9A" Eval="x bit 64" Unit="on/off" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="0" GaugeMax="1" ChartMin="0" ChartMax="1" ScalingFactor="1" Notes="" Priority="1" Visible="False" />
88590015 ROM
Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="3fce" type="2D" level="1" scaling="Load8">
  <table name="Engine Speed" address="6b7a" type="Y Axis" elements="10" scaling="RPM"/>
</table>

<table name="Low/High Voltage Transition Hysteresis" category="Fuel" address="1674" type="1D" level="1" scaling="Load16"/>
Last edited by mrfred; Feb 2, 2012 at 08:58 AM.
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Old Jan 14, 2012, 02:41 PM
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88580014 ROM:
Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="3FF2" type="2D" level="1" scaling="Load8"> 
<table name="Engine Speed" address="6D56" type="Y Axis" elements="10" scaling="RPM"/>
</table>

<table name="Low/High Voltage Transition Hysteresis" category="Fuel" address="1674" type="1D" level="1" scaling="Load16"/>
Last edited by donner; Jan 15, 2012 at 09:37 AM.
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Old Jan 14, 2012, 03:00 PM
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Thank you as always, MrFred!

94170015 pretty please

-Jamie
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Old Jan 14, 2012, 03:21 PM
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88840017

Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="3FF2" type="2D" level="1" scaling="Load8"> 
<table name="Engine Speed" address="6C82" type="Y Axis" elements="10" scaling="RPM"/>
</table>
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Old Jan 14, 2012, 03:27 PM
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Originally Posted by Dynotech Tuning
Thank you as always, MrFred!

94170015 pretty please

-Jamie
94170015:
Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="4556" type="2D" level="1" scaling="Load8"> 
    <table name="Engine Speed" address="642E" type="Y Axis" elements="10" scaling="RPM"/>
    </table>

<table name="Low/High Voltage Transition Hysteresis" category="Fuel" address="1A74" type="1D" level="1" scaling="Load16"/>
Last edited by donner; Jan 15, 2012 at 09:41 AM.
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Old Jan 14, 2012, 03:29 PM
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96530006

Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="4568" type="2D" level="1" scaling="Load8"> 
<table name="Engine Speed" address="6576" type="Y Axis" elements="10" scaling="RPM"/>
</table>
Last edited by Speedlimit; Sep 25, 2015 at 04:46 AM.
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Old Jan 14, 2012, 03:30 PM
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Thank you very much mfred !
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Old Jan 14, 2012, 07:36 PM
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Originally Posted by mrfred
88590015 ROM
Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="3fce" type="2D" level="1" scaling="Load8">
  <table name="Engine Speed" address="6b7a" type="Y Axis" elements="10" scaling="RPM"/>
</table>
This shows up in ECU Flash as Load "%." Is this "Load 1byte" or some other value?
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Old Jan 14, 2012, 09:05 PM
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Originally Posted by 240Z TwinTurbo
This shows up in ECU Flash as Load "%." Is this "Load 1byte" or some other value?
Its load vs rpm. Anytime load is above the load in the table, the fuel pump will be fed full voltage.
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Old Jan 15, 2012, 02:49 AM
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Is there any hysteresis value ?
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Old Jan 15, 2012, 05:11 AM
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88570008

Code:
	<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="39a4" type="2D" level="1" scaling="Load8">
		<table name="Engine Speed" address="5c6e" type="Y Axis" elements="10" scaling="RPM"/>
	</table>
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Old Jan 15, 2012, 05:23 AM
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Question
90550001?
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Old Jan 15, 2012, 06:21 AM
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Originally Posted by dolphin888
90550001?
There you go :

Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="438E" type="2D" level="1" scaling="Load8"> 
<table name="Engine Speed" address="4ca2" type="Y Axis" elements="10" scaling="RPM"/>
</table>
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Old Jan 15, 2012, 06:52 AM
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Originally Posted by mrfred
Its load vs rpm. Anytime load is above the load in the table, the fuel pump will be fed full voltage.
Thank you and I will post results today.
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Old Jan 15, 2012, 06:58 AM
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nice find Mychailo as always.
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