EvolutionM - Mitsubishi Lancer and Lancer Evolution Community - fuel pump low/high voltage transition table

- ECU Flash (https://www.evolutionm.net/forums/ecu-flash-179/)

- - fuel pump low/high voltage transition table (https://www.evolutionm.net/forums/ecu-flash/593299-fuel-pump-low-high-voltage-transition-table.html)

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"/>

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"/>

Thank you as always, MrFred!

94170015 pretty please :)

-Jamie

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>

Quote:

Originally Posted by Dynotech Tuning (Post 9890504)

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"/>

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>

Thank you very much mfred ! {thumbup}

Quote:

Originally Posted by mrfred (Post 9890334)

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?

Quote:

Originally Posted by 240Z TwinTurbo (Post 9890955)

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.

Is there any hysteresis value ?

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>

Quote:

Originally Posted by dolphin888 (Post 9891395)

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>

Quote:

Originally Posted by mrfred (Post 9891063)

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.

nice find Mychailo as always.