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eCtune and jaw wideband reader

Old 08-29-2008, 01:01 AM
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Default eCtune and jaw wideband reader

I have ectune and a jaw wideband, ectune has the jaw listed as one of the options for wideband inputs jaw v out is set correctly jaw says v out is 1.47v double checked with fluke meter and it is correct. ectune says the v input for the wide band is 1.04v
I know that I can fix the a/f display by using the offset, but when I use the offset it also changes the lowest value a/f that ectune will display.
Eg. with the offset at 0 the lowest value a/f is 10.18 but with the offset set at 3 the lowest that it will read is 13.18.
this of course makes it hard to tune the areas of the map that I need lower a/f's
Anyone else have this problem?
the ecu and the wideband get the power and ground from the same wires.
I now i can buy a lc-1 and log with its seriel ou put directly in eCtune but i don't want to spend the cash!
Thanks for the help, Wes
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Old 08-29-2008, 02:04 AM
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Default Re: eCtune and jaw wideband reader

Don't share power and ground wires. Those things are skinny, they can't handle peak load and you cause part of your problems.

Draw power from the fuse box, or battery. Run a seperate ground to the thermostat housing, where the ECU sensor ground is.

99% likely your 0.43v disparity is from resistance across your ground path @ the ECU wiring to the ground at the thermostat housing. The ECU compares voltage vs that thermostat housing sensor ground, not it's main power grounds or the unibody or somewhere under the dashboard or the negative terminal of the battery or any other failure ground electrical n00bs think work just fine.
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Old 08-29-2008, 02:21 AM
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Default Re: eCtune and jaw wideband reader

Very cool I will give it a try and post the results
Thanks for the fast response
Wes
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Old 08-29-2008, 02:25 AM
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Default Re: eCtune and jaw wideband reader

No problemo.

If you have any problems or questions about eCtune, drop me a line.
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Old 08-29-2008, 03:26 AM
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Default Re: eCtune and jaw wideband reader

will do, i got it a week ago and its way easier to use makes a lot more since
Thanks
Wes
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Old 08-29-2008, 09:42 AM
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Default Re: eCtune and jaw wideband reader

I was having the same problem... even with a dedicated 18 gauge ground to the thermostat and power coming directly off the battery. I gave up on it. If you figure out the secret let me know. I'm thinking perhaps my other grounds aren't sufficient (corroded and wire strands broken from being 15 years old).

Edit: The other thing I noticed about it was the offset would fluctuate. At times it would be .01V, at others almost a full Volt.
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Old 08-29-2008, 09:57 AM
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Default Re: eCtune and jaw wideband reader

Originally Posted by TorganFM
I was having the same problem... even with a dedicated 18 gauge ground to the thermostat and power coming directly off the battery. I gave up on it. If you figure out the secret let me know. I'm thinking perhaps my other grounds aren't sufficient (corroded and wire strands broken from being 15 years old).

Edit: The other thing I noticed about it was the offset would fluctuate. At times it would be .01V, at others almost a full Volt.
i remember you having a hell of a time with that ----, i thought you had figured it out
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Old 08-29-2008, 12:12 PM
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Default Re: eCtune and jaw wideband reader

Run a fixed voltage to the ECU pin, use a regulator NOT a voltage divider, then see if it varies as you vary electrical load. That reveals bad grounds like no other.
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Old 08-29-2008, 01:39 PM
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Default Re: eCtune and jaw wideband reader

Originally Posted by MAJORAHOLE
i remember you having a hell of a time with that ----, i thought you had figured it out
I had the voltage offset narrowed down after I added the dedicated thermo ground and battery voltage a little bit, but I never really got a true reading for afr from the ECU pickup of the JAW. Also by the time I got the offset narrowed down some I figured the O2 was fouled from being plugged into the exhaust but not heated, so I just gave up.
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Old 08-29-2008, 01:46 PM
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Default Re: eCtune and jaw wideband reader

Originally Posted by Joseph Davis
Run a fixed voltage to the ECU pin, use a regulator NOT a voltage divider, then see if it varies as you vary electrical load. That reveals bad grounds like no other.
Just the base reading from the JAW (1.02V) when I'm running pig rich had the offset too. Something else happened with the JAW though... If I let the car idle after warming up on the ****'s basemap the JAW would show 34.28 or whatever the max lean should read. I bet if I hooked it up and got it going it would show 34 AFR at times. I'll just end up getting an LC-1 when I crank the boost past 11psi. This bitch screams as it is and has for a year so I'm not concerned about being technically 'untuned.' Plus 30-35 mpg isn't really pressing me to tune for mileage.
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