Can't adjust fuel or PMW current limit%

Clifton · Post by **Clifton** » Thu Jun 01, 2006 5:09 pm

If I change the fuel numbers under Tables/VE tables and burn to ecu nothing happens. If I try it under Tunning/VE tables, again nothing. I can adjust Acceleration Wizard though under Tunning and that works. Also I can adjust injector opening time and PWM time threshold but adjusting PWM current limit % does nothing. I can go from 75% to 1% with no difference. I have tried burning to ecu each time too. Another thing. If I try to open a saved file I get.. Page 1. Could not connect to controller, then an identical page 2 error and I loose the connection and have to restart.

MSII v3 MT2.25 V2.33

Bernard Fife · Post by **Bernard Fife** » Thu Jun 01, 2006 5:14 pm

If I change the fuel numbers under Tables/VE tables and burn to ecu nothing happens.

Clifton,

Do you mean the number reverts to the previous value, or it stasys at the value you changed it to (which is the way it is supposed to work)?

Do you get any error messages? Have you activated the approopriate INI file and CODE_VARIANT?

Are you testing on the car or with a stim? Do you have good voltage at the stim?

You might try hitting 'Tab' after changing a value - this helps in some cases (apparently depending on Windows settings).

Lance.

Clifton · Post by **Clifton** » Thu Jun 01, 2006 5:50 pm

lance wrote: Do you mean the number reverts to the previous value, or it stasys at the value you changed it to (which is the way it is supposed to work)?

It will stay at what I changed it to but there isn't a change in my AFR.

lance wrote: Do you get any error messages? Have you activated the approopriate INI file and CODE_VARIANT?

It is set to MSII, no error on that.

lance wrote: Are you testing on the car or with a stim? Do you have good voltage at the stim?

It was preassembled so I didn't get a stim. If you mean good ecu voltage it is good.

lance wrote: You might try hitting 'Tab' after changing a value - this helps in some cases (apparently depending on Windows settings).

I just went out and tried it. It didn't make a difference. I did it on PWM%
and VE under Tables. I did set my fuel numbers to "0" from 600rpm to 1500rpms and low load(idle) values. It should have shut the car off I would think. I saved it and then closed MT and shut of MS. I then opened MT and pulled up the the VE table. It was blank until I started the car and then fetched from ECU. It came up as I had saved it on MS with the changes (0's).

Bernard Fife · Post by **Bernard Fife** » Thu Jun 01, 2006 5:56 pm

I did set my fuel numbers to "0" from 600rpm to 1500rpms and low load(idle) values. It should have shut the car off I would think.

Clifton,

Not if your opening time and PWM time threshold aren't right.

I saved it and then closed MT and shut of MS. I then opened MT and pulled up the the VE table. It was blank until I started the car and then fetched from ECU. It came up as I had saved it on MS with the changes (0's).

I not sure I understand what you are saying, isn't this what you expect to happen?

Lance.

Clifton · Post by **Clifton** » Thu Jun 01, 2006 6:30 pm

lance wrote:
I did set my fuel numbers to "0" from 600rpm to 1500rpms and low load(idle) values. It should have shut the car off I would think.
Clifton,

Not if your opening time and PWM time threshold aren't right.

I saved it and then closed MT and shut of MS. I then opened MT and pulled up the the VE table. It was blank until I started the car and then fetched from ECU. It came up as I had saved it on MS with the changes (0's).
I not sure I understand what you are saying, isn't this what you expect to happen?

Lance.

Yes. That's what I expected to happen but I thought if I had it set to zero it would not be injecting.

I have my opening time and threshold set at 1.3. If it's set to 1.2 it will quickly go from about 10:1 afr's with the 1.3 setting to mid 16:1's and stall. The zero setting on the fuel didn't budge my afr's out of the 10:1 range. They were at 9 previously.

Bernard Fife · Post by **Bernard Fife** » Thu Jun 01, 2006 6:50 pm

Clifton,

If you set the PWM% too low, and the PWM time threshold is longer then the actual opening time, the engine may run fine at low pulse widths. So you need to blip the throttle while setting the PWM% to make sure that longer pulse widths still work well (you may have to drive the vehicle to find out).

You should not use the PWM time threshold and opening time to tune the engine (I.e., to adjust the AFR). If the engine is unresponsive to VE and PWM% changes, the PWM time threshold and/or the opening time are most likely wrong for your injectors. You should set them at reasonable values, then tune to them by leaving them constant. Read this: http://www.megamanual.com/v22manual/mtune.htm#pwm

To me, it seems like 1.3 is too long for the opening time and PWM time threshold, based on your description. I would set them both back to 1.0, then adjust the PWM% (raise it as described in the manual) and idle VEs (raise them) to get the engine running properly (I suspect you are running mostly on the fuel injected during the opening time/PWM time threshold right now).

Lance.

Clifton · Post by **Clifton** » Fri Jun 02, 2006 12:43 pm

lance wrote:Clifton,

To me, it seems like 1.3 is too long for the opening time and PWM time threshold, based on your description. I would set them both back to 1.0, then adjust the PWM% (raise it as described in the manual) and idle VEs (raise them) to get the engine running properly (I suspect you are running mostly on the fuel injected during the opening time/PWM time threshold right now).

Lance.

I tried lowering it to 1.0 and raising the VE fuel. I scaled the whole map up. I went from 0 to 104 at the idle area. It still won't idle at 1.0. It will idle at 1.2 if I let it warm up but changing the VE has no effect at idle or revving.

Bernard Fife · Post by **Bernard Fife** » Fri Jun 02, 2006 12:49 pm

Clifton,

That's likely because the PWM% is too low.

Lance.

Clifton · Post by **Clifton** » Fri Jun 02, 2006 1:36 pm

I can adjust it from 1% to 100% with no change, same as the VE table. It's like it doesn't stick.

Bernard Fife · Post by **Bernard Fife** » Fri Jun 02, 2006 1:55 pm

Clifton,

You need to set one (PWM%), then adjust the other (VE), then go back to the first, and so on.

Until you do that, you aren't going to see any changes.

Lance.