JDM Legacy Spec B GT 2003 Cruise limiter

rs2.3 · **Joined:** Fri Jun 06, 2025 1:27 pm **Posts:** 3

Hi,

I’m looking into trying to raise the JDM cruise control limiter on my 2003 Spec B legacy. I have downloaded the rom but can’t seem to see a drop down anywhere that allows me to change this? Do I need to look somewhere else?
Thanks

benc911 · **Joined:** Sun Nov 19, 2023 6:27 am **Posts:** 6

did you sort this?

rs2.3 · **Joined:** Fri Jun 06, 2025 1:27 pm **Posts:** 3

No luck yet, can’t seem to find the setting anywhere. Can anyone shed any light?

cortin · **Posted:** Sun Aug 10, 2025 2:28 am

rs2.3 wrote:

No luck yet, can’t seem to find the setting anywhere. Can anyone shed any light?

Which cal id or ecu id?

danci1973 · **Posted:** Sun Aug 10, 2025 3:13 am

Your ROM definition is probably missing the cruise control speed limiting tables definition.

Have a look at viewtopic.php?f=40&t=9549, maybe you find some answers or someone to help you with table definitions.

kiki86 · **Posted:** Tue Aug 12, 2025 12:39 pm

You can try this

<table name="Cruise Control Speed Limit Minimum A" address="63798"/>

<table name="Cruise Control Speed Limit Minimum B" address="637A0"/>

<table name="Cruise Control Speed Limit Minimum C" address="637A8"/>

<table name="Cruise Control Speed Limit Minimum D" address="637B0"/>

<table name="Cruise Control Speed Limit Minimum E" address="637B8"/>

<table name="Cruise Control Speed Limit Maximum A" address="6379C"/>

<table name="Cruise Control Speed Limit Maximum B" address="637A4"/>

<table name="Cruise Control Speed Limit Maximum C" address="637AC"/>

<table name="Cruise Control Speed Limit Maximum D" address="637B4"/>

<table name="Cruise Control Speed Limit Maximum E" address="637BC"/>

T3mppu · **Joined:** Thu Nov 25, 2021 8:25 am **Posts:** 2

What is your ECU ID?

I have BP5 (4th gen) JDM 2003 Spec B with ECU Internal ID: A2ZJD02B

Mine is a manual and did not have the cruise control stalk and brake switch, also no cruise lights in dash.

Got the definitions for similar AT model.
With these my cruise has been working for a few years now.

Code:

    <!-- Cruise tables, check that values match yours -->
        <table name="Cruise Control Speed Limit Min A" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Min</data>
            </table>
        </table>
        <table name="Cruise Control Speed Limit Min B" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Min</data>
            </table>
        </table>
        <table name="Cruise Control Speed Limit Max A" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Max</data>
            </table>
        </table>
        <table name="Cruise Control Speed Limit Max B" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Max</data>
            </table>
        </table>
   
        <table name="Cruise Control Speed Limit Min C" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Min</data>
            </table>
        </table>
        <table name="Cruise Control Speed Limit Min D" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Min</data>
            </table>
        </table>
        <table name="Cruise Control Speed Limit Min E" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Min</data>
            </table>
        </table>
        <table name="Cruise Control Speed Limit Max C" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Max</data>
            </table>
        </table>
        <table name="Cruise Control Speed Limit Max D" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Max</data>
            </table>
        </table>
        <table name="Cruise Control Speed Limit Max E" category="Miscellaneous - Limits" type="2D" level="4" scaling="VehicleSpeed(KMH)" storagetype="float" endian="little" sizey="1">
            <description>The speed limiter is disengaged when vehicle speed is equal to or drops below this value after already engaging the limiter.</description>
            <table name="Speed Limiter Fuel Cut" type="Static Y Axis" elements="1">
                <data>Max</data>
            </table>
        </table>

        <table name="Cruise Control Speed Limit Min A" storageaddress="0x5FF7C"/>
        <table name="Cruise Control Speed Limit Max A" storageaddress="0x5FF90"/>
        <table name="Cruise Control Speed Limit Min B" storageaddress="0x5FF80"/>
        <table name="Cruise Control Speed Limit Max B" storageaddress="0x5FF94"/>
        <table name="Cruise Control Speed Limit Min C" storageaddress="0x5FF84"/>
        <table name="Cruise Control Speed Limit Max C" storageaddress="0x5FF98"/>
        <table name="Cruise Control Speed Limit Min D" storageaddress="0x5FF88"/>
        <table name="Cruise Control Speed Limit Max D" storageaddress="0x5FF9C"/>
        <table name="Cruise Control Speed Limit Min E" storageaddress="0x5FF8C"/>
        <table name="Cruise Control Speed Limit Max E" storageaddress="0x5FFA0"/>
     <!-- /added Cruise tables, check that values match yours -->

Not sure what each letter stands for (maybe something AT related), here are my values derived from the AT values.

My new values in kmh:
A-Min 37
A-Max 250
B-Min 40
B-Max 250
C-Min 38
C-Max 245
D-Min 37
D-Max 250
E-Min 39
E-Max 250

rs2.3 · **Joined:** Fri Jun 06, 2025 1:27 pm **Posts:** 3

Thanks for the replies. The ECU id is A2ZJD00A.
The car didn't have cruise from factory, I retro fitted it using the original stalk and 4 pin brake light switch. The cruise lights all show on the dash when cruise is enabled but it doesn't engage over around 64mph. Will have a look again into the definitions to see if I can see anything.

Cheers

RomRaider

Forum rules

JDM Legacy Spec B GT 2003 Cruise limiter

Who is online