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Switched to v7, car runs for a few seconds then dies

Old Jan 6, 2018, 05:24 PM
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Switched to v7, car runs for a few seconds then dies

Hi everyone. I've already asked on the v7 thread but I haven't had an answer, and i am hoping to make some progress on the map tomorrow so figured I'd start a thread. Basically as the title says, I've just switched to tephra v7 but the engine dies a few seconds after starting. It holds 2k or so as normal and then as the revs drop to idle it just drops off and dies. I'm just wondering if anyone has any idea why it would do that? There aren't any desired ISCV tables on the 88590715 xml I'm using but they're not needed on this rom from what ive read, so I guess that's nothing to do with it. The other idle settings seem normal. I've used the big maps calculator to copy across the maps from my working v5 rom, so I assume it's nothing to do with them.

Any ideas appreciated

Last edited by D1andonlyantman; Jan 7, 2018 at 02:52 AM.
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Old Jan 8, 2018, 11:35 AM
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What about Immobilizer Code? Or diasable or at all.
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Old Jan 8, 2018, 11:40 AM
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It starts but as soon as the revs drop down to idle it dies. I assume the immobiliser would stop it firing at all. I done a little log and you can see the IDC go up to around 2.5 but then the revs and IDC go down until it stalls. A little IDC spike near the bottom as it tries to stay alive I guess, but it doesn't even do more than a little rev before it dies
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Old Jan 8, 2018, 12:07 PM
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Is it only an ideling issue , or does the Car die if you press the Pedal?
Efg
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Old Jan 8, 2018, 01:42 PM
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Ive experienced this on my buddies car.
I fixed it by adjusting the BISS screw.
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Old Jan 8, 2018, 02:09 PM
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EFF, I'll have to check at the weekend. My battery is so small that It'll only upload a map when it's just been running or is hooked up to another battery, and that's a nightmare to do in the dark evenings we've got atm, and it's currently got v5 on it. I don't want to risk a failed upload as have to start moving about cars to get a jump (which happened earlier tonight). But it does seem like an idle issue. If the revs only stay at 2k for a second it drops and dies really quickly. Sometimes when I start it it holds 2k for bit longer, seems fine but then as they drop it dies.

4b11, it runs fine on my v5 rom. Just v7 that's playing up. I'll be the first to admit that I'm far from a processional. I can map it, and have half an idea what a fair bit of the stuff does, but finding faults in the technical stuff is way beyond me tbh.
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Old Jan 16, 2018, 11:47 AM
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Courtesy of Mfred... CLICK HERE

With that, here are the tables for the 88590015 ROM:

-----
<scaling name="ISCV_AX2_8" units="% Demand" toexpr="x*100/255" frexpr="x*255/100" format="%.1f" min="0" max="200" inc="0.5" storagetype="uint8" endian="big"/>
<scaling name="ISCV_AX2_16" units="% Demand" toexpr="x*100/255" frexpr="x*255/100" format="%.1f" min="0" max="200" inc="0.5" storagetype="uint16" endian="big"/>

<table name="ISCV Demand Target Idle Trim (sub_1ECF6)" category="ISCV Control" type="2D" address="3dec" level="2" scaling="ISCV_AX2_8">
<table name="Target Idle Deviation" type="Y Axis" address="6c9e" elements="9" scaling="RPMTarget"/>
</table>

<table name="Target Idle ISCV Trim Adjust Frequency" category="ISCV Control" address="14c2" type="1D" level="2" scaling="Time"/>

<table name="ISCV Demand Below 500 RPM Idle Recovery Adder (sub_1E2C8)" category="ISCV Control" address="1516" type="1D" level="2" scaling="ISCV_AX2_16"/>


<table name="ISCV Demand Startup CTS Adder (sub_1EBB8)" category="ISCV Control" type="2D" address="3d60" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="6fde" elements="8" scaling="Temp"/>
</table>


<table name="ISCV Demand General CTS Subtractor (sub_1EBE6)" category="ISCV Control" type="2D" address="3e0a" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="6fde" elements="8" scaling="Temp"/>
</table>


<table name="ISCV Demand Baro Adder (FFFF6E98) (sub_1E1EE)" category="ISCV Control" type="2D" address="3dda" level="2" scaling="ISCV_AX2_8">
<table name="Baro" type="Y Axis" address="6e28" elements="5" scaling="Baro16"/>
</table>

<table name="ISCV Demand RPM Adder* (sub_1EFC0)" category="ISCV Control" type="2D" address="41d8" level="2" scaling="ISCV_AX2_8">
<table name="RPM" type="Y Axis" address="6b7a" elements="10" scaling="RPM"/>
</table>

<table name="ISCV Demand TPS Subtractor* (sub_1EFC0)" category="ISCV Control" type="2D" address="6810" level="2" scaling="ISCV_AX2_8">
<table name="Shifted TPS" type="Y Axis" address="810c" elements="11" scaling="ThrottlePercentage"/>
</table>

<table name="ISCV Demand RPM Adder [rpm > 4500, load > 170, speed > 12 mph] (sub_1EFC0)" category="ISCV Control" type="2D" address="65de" level="2" scaling="ISCV_AX2_8">
<table name="RPM" type="Y Axis" address="7fb0" elements="10" scaling="RPM"/>
</table>

<table name="ISCV Demand CTS Adder #1** (sub_1F1F8, sub_1EA0C, sub_1F596) [sub_1EFC0]" category="ISCV Control" type="2D" address="3d38" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="70c2" elements="8" scaling="Temp"/>
</table>

<table name="ISCV Demand CTS Adder #2** (Post WOT) (sub_1F1F8) [sub_1EFC0]" category="ISCV Control" type="2D" address="54e6" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="7070" elements="8" scaling="Temp"/>
</table>

<table name="ISCV Demand CTS Adder #1a*** (sub_1F2C6, 1F596) [sub_1EFC0]" category="ISCV Control" type="2D" address="51b0" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="70c2" elements="8" scaling="Temp"/>
</table>

<table name="ISCV Demand CTS Adder #1b*** (sub_1F2C6) [sub_1EFC0]" category="ISCV Control" type="2D" address="3d4c" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="70c2" elements="8" scaling="Temp"/>
</table>

<table name="ISCV Demand CTS Adder #2*** (Post WOT) (sub_1F2C6) [sub_1EFC0]" category="ISCV Control" type="2D" address="5502" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="7070" elements="8" scaling="Temp"/>
</table>

<table name="ISCV Demand RPM Adder (Moderated by Baro, IATS) (FFFF6EA8) (sub_204B6) [sub_1EFC0]" category="ISCV Control" type="2D" address="672a" level="2" scaling="ISCV_AX2_8">
<table name="RPM" type="Y Axis" address="802a" elements="10" scaling="RPM"/>
</table>

<table name="ISCV Demand Power Steering Baro Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0]" category="ISCV Control" type="2D" address="6adc" level="2" scaling="ISCV_AX2_8">
<table name="Baro" type="Y Axis" address="6e28" elements="5" scaling="Baro16"/>
</table>

<table name="ISCV Demand Power Steering IATS Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0]" category="ISCV Control" type="2D" address="6ae8" level="2" scaling="ISCV_AX2_8">
<table name="Intake Air Temp" type="Y Axis" address="714a" elements="8" scaling="Temp"/>
</table>


<table name="ISCV Demand TPS Adder, AC off (FFFF6E84) (mattjin fuel cut delay)" category="Idle" address="3d6e" type="2D" level="1" scaling="ISCV_AX2_8">
<table name="TPS" address="6f9a" type="Y Axis" elements="7" scaling="ThrottlePercentage"/>
</table>

<table name="ISCV Demand TPS Adder, AC on (FFFF6E84) (mattjin fuel cut delay)" category="Idle" address="3d82" type="2D" level="1" scaling="ISCV_AX2_8">
<table name="TPS" address="6f9a" type="Y Axis" elements="7" scaling="ThrottlePercentage"/>
</table>

<table name="ISCV Demand CTS Addder (FFFF6E84)" category="Idle" address="4e56" type="2D" level="1" scaling="ISCV_AX2_8">
<table name="Coolant Temp" address="6fde" type="Y Axis" elements="8" scaling="Temp"/>
</table>

<scaling name="ScaleBase64Adder" units="Mult. Factor" toexpr="(x+64)/64" frexpr="64*(x-1)" format="%.2f" min="0" max="10" inc="0.05" storagetype="uint8" endian="big"/>
<table name="Baro Mult. Factor for ISCV Demand Adder FFFF6E84" category="Idle" address="6b68" type="2D" level="1" scaling="ScaleBase64Adder">
<table name="Baro" address="6e4e" type="Y Axis" elements="5" scaling="Baro16"/>
</table>


<table name="Idle Stepper Lookup Table" category="ISCV Control" type="3D" address="3e31" scaling="ISCVSteps">
<table name="Coolant Temp" type="X Axis" elements="8" address="7164" scaling="Temp"/>
<table name="ISCV Demand" type="Y Axis" elements="27" address="717e" scaling="ISCV_AX2_16"/>
</table>
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Old Jan 16, 2018, 11:49 AM
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Courtesy of Jack_of_Trades CLICK HERE

If the car won't start at all, adjust the tables labeled #1 for fuel and ISCV.
If the car starts but then runs really rough or dies within the first few seconds, adjust the #2 tables.
If the car starts, runs for a few seconds really well then begins to run rough or stall, adjust the #3 tables.

Should sort out your problems....
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Old Jan 16, 2018, 03:19 PM
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Thanks. I guess you mean 88590715? And that will work on my UK ix? 88570008. A friend done sone searching when i was having some issues and found a thread where tephra himself said there was no rom for 88570008. No way of telling at what stage in v7 development he said it though
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Old Jan 17, 2018, 10:13 AM
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Will also work on the 88590715 rom... but will not work on the 88570008 rom.
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Old Jan 17, 2018, 11:11 AM
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Cool, I'll give it a go when I get a chance. Thanks
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