PRA ECU - WIDEBAND O2 SENSOR?

Stuart · Post by **Stuart** » Sun Jun 29, 2008 9:01 am

that's intersting....

I wonder if the ELD input has a pull-up resistor in the ECU?

Can't say I have seen this before, are you sure nothing else is connected to it (like the ELD?)

Narrowband output should eb OK as it is, and looking at your earlier log, looked to be working about right?

carbonctr · Post by **carbonctr** » Sun Jun 29, 2008 11:51 pm

Stuart wrote:that's intersting....

I wonder if the ELD input has a pull-up resistor in the ECU?

Can't say I have seen this before, are you sure nothing else is connected to it (like the ELD?)

Narrowband output should eb OK as it is, and looking at your earlier log, looked to be working about right?

The ELD wire is definitely disconnected and isolated. Only the analog two output is connected to it. There is a load of stuff about resistors that need cut in the S-Manager forum for a US ECU to improve input...wonder if this is the case for the PRA one too?
The narrowband output does not seem to input correct voltages to the ECU either once connected. The O2 sensor in KManager displays different voltages than it is supposed to, unless this is not actually the voltage input of pin ECU A6.
0.24V at full throttle with a target AFR of 12.5 - should surely be higher than 1.1V? However, this is almost the same value as with the stock O2 sensor fitted.
The car does start to splutter and cut out once it has been idling in closed loop for a few minutes.

Stuart · Post by **Stuart** » Mon Jun 30, 2008 12:38 am

got a datalog if it doing that?

carbonctr · Post by **carbonctr** » Mon Jun 30, 2008 1:09 am

Stuart wrote:got a datalog if it doing that?

I'm afraid not as the LC-1 is now giving out crazy readings and I have forced the car into open loop. I'm suspecting the LC-1 is sooted up again so I will need to take it out, clean it and recalibrate again. I'll do a datalog once I've done this.
I'm thinking of just using the stock primary sensor again as it works fine. I don't think my ECU is suitable for using the ELD pin for the input so it is kind of pointless. I might just stick the LC-1 in the sec o2 location and use Logworks to monitor the AFR instead as the serial output works fine.
It is a long shot, but...Hondata...any plans to integrate the serial input from the Innovate LC-1 into KManager for datalogging?

Maverik · Post by **Maverik** » Mon Jun 30, 2008 7:03 am

Hi,

The narrowband simulated output I am using is: 0.9V=14 AFR and 0.1V=15 AFR. My wideband module is a TechEdge 3B1.

carbonctr · Post by **carbonctr** » Mon Jun 30, 2008 7:42 am

Maverik wrote:Hi,

The narrowband simulated output I am using is: 0.9V=14 AFR and 0.1V=15 AFR. My wideband module is a TechEdge 3B1.

I'll try programming to these output values and see what happens...
Thanks for that :-)

carbonctr · Post by **carbonctr** » Wed Jul 02, 2008 12:27 pm

Stock primary o2 sensor back in and car running correctly now. LC-1 in secondary location. It has lost it's calibration AGAIN so the reading is all over the place until I try to calibrate it again. I think I'm going to give up on the LC-1, totally unpredictable piece of kit! ?150 wasted :-(

carbonctr · Post by **carbonctr** » Fri Jul 04, 2008 7:24 am

Calibrated the LC-1 again...seems to be working for now. Programmed analog output to default. I set the output to flatline set voltages and read the ELD pin voltage to work out a conversion table. Here's the results:
LC-1 V---ELD V------AFR
0---------1.333-------7.350
1---------1.958-------10.358
2---------2.681-------13.366
3---------3.413-------16.374
4---------4.145-------19.382
5---------4.853-------22.390

Looks to be giving reasonably accurate AFR's in KManager now :-)
Fingers crossed that it remains so. I'm not going to touch it now!

carbonctr · Post by **carbonctr** » Fri Jul 04, 2008 10:09 am

The above conversions input into KManager give a really close AFR reading. Nice one :D

Garrett_si · Post by **Garrett_si** » Mon Jul 07, 2008 12:02 pm

there is one thing to keep in mind when using the ELD input for external wideband

you need to ajust the voltage offset

the big problem with the LC-1 is that you don't have a display so you aren't able to ajust your offset

and the offset could be of about 1:1 in some cases

carbonctr · Post by **carbonctr** » Tue Jul 08, 2008 2:08 am

Garrett_si wrote:there is one thing to keep in mind when using the ELD input for external wideband

you need to ajust the voltage offset

the big problem with the LC-1 is that you don't have a display so you aren't able to ajust your offset

and the offset could be of about 1:1 in some cases

The LC-1 has a serial output which allows accurate AFR values to be viewed on a PC using Logworks. This serial output is not effected by voltage offsets.
The easiest way is to program the LC-1 to flatline a set voltage for all AFR values and check what voltage the ELD pin reads (eg. Program the LC-1 analog out 2 to 0V=7.35AFR, 0V=22.39AFR). This way you know the voltage output of the analog 2 wire regardless of AFR. I did this for 0,1,2,3,4 and 5V to make my conversion table. Now KManager is datalogging accurate AFR values when compared to Logworks. Now we're jamming :-)
Is there a way to work out how much to reduce the fuel table value by looking at a datalog? I would like to tweak my calibration on the road...