EDIT - problem fixed, it was the wiring

Hello-

I am using a MAC valve for my boost solenoid, coupled with s300



I just returned from travel and took the car out, and noticed that it wouldn't boost past ~6psi. I checked for continuity between the ECU PWM out, and also +12v, and the solenoid sees both.

When I lock the solenoid with the valve on the top, the car boosts with no ceiling. I did a quick datalog and noticed that the boost cut never activated.

Does this hint that the solenoid is dead? If anyone has any suggestions as to possible troubleshooting datalogs, I would be greatly appreciative.

Thanks!

Sebastian


Modified by B18EG6 at 7:57 PM 5/16/2008

 

The ecu should be pulsing ground to the solenoid when it opens it. Try hooking a +12v to one side of the solenoid and the other side to ground and see if you can blow through it. If so the solenoid is working.

 

I had a chance tonight to check it. Putting 12v across it definitely causes it to open, so maybe it was just stuck. Hopefully this cleared it of whatever was stuck, I'll drive it and see how it does.

Thanks!

 

 

grrr this wasn't it. Boost still doesn't build past 0.5 bar or so.

I tried setting the solenoid to overboost, just to see if hondata would send the boost cut, and it didn't.

For a datalog, go here (two separate datalogs)
http://sebastianstewart.net/Hondata/

edit - these logs are of the solenoid in normal operating condition, with a 3psi set boost cut. I boosted to about 15psi in each log, in any gear.


Modified by B18EG6 at 8:19 AM 4/11/2008

 

the links dont seem to work

 

Thats odd? Maybe the server deleted them because it thought they were malicious?

Try this
http://sebastianstewart.net/Hondata/

Then download them from the folder. Hopefully they will stay in there long enough!

 

i wonder why boost cut isn't kicking in. Can you post your calibration?

 

I added it to the /Hondata dir on the server

note that the boost cut was set to 3psi in the data logs, although the calibration file does not reflect this. I believe the cal file I posted has true boost by gear values, NOT the reset 3psi for the runs I did.

Even if you assume I didn't upload the new 3psi cutoff correctly, the cut should have come on because I easily boosted to ~10 psi in first gear.

 

hmm thats odd. You may want to post on the hondata forums about it. Can you lower the solenoid activation pressure so it pulses it even when the key is on and engine not running? That way you can tell if its working. Its odd boost cut didn't work though.

 

sure I can certainly do that. What should I change it to? 0.5psi?

I want to isolate the possibility of an intermittent break in the wire so the next step is to wire it directly to the solenoid from the ECU; no connectors.

 

I would set it to 0psi which should be atmospheric

 

I set the solenoid activation pressure to 0PSI and set each gear cut off to 0PSI and noticed no boost cut when idle (or revving a little)

Im'a go direct wire it to check for an intermittent short

 

off topic

What's the part# on solenoid?

 

The boost cut has nothing to do with the boost solenoid or the boost control part of the S300 at all. I didn't look at your logs or file, but obviously the boost cut should be working. If it's not, it's not related to the boost controller problems. It simply cuts if the MAP signal goes over the preset limit.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbocivic94 &raquo;</TD></TR><TR><TD CLASS="quote">off topic

What's the part# on solenoid?</TD></TR></TABLE>

Damn I thought this was shown in the picture LOL but its 35A-B00-DDBA-4BA

Tony-thanks for the reply. I have a motorola 2.5 bar MAP sensor. When you graph the PWM on the datalog, you can see that the duty cycle does indeed change through the spectrum... so this kinda makes me think that ECM is sending the correct signal?

 

well the boost cut is unrelated to the pwn control so that should be kicking in regardless of what your pwm duty is set at.

 

I tried doing a search with that number before I asked and nothing came up LOL

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">well the boost cut is unrelated to the pwn control so that should be kicking in regardless of what your pwm duty is set at. </TD></TR></TABLE>

Ahh I see now. Sorry, I am kinda new to Hondata. Any suggestions to narrow it down at all? I returned home today and plan on taking it out for a while.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbocivic94 &raquo;</TD></TR><TR><TD CLASS="quote">I tried doing a search with that number before I asked and nothing came up LOL</TD></TR></TABLE>

ya know... I remember something now. When I got the valve from a member on here, there was white out over the part number (or at least part of it) and I scratched it off by accident and saw the other part number.

Check page 11 on this PDF
http://www.macvalves.com/produ...5.pdf

My part number doesnt exactly fit any of the descriptions, but some of the options I gathered are 12VDC (5.4W), 18" flying leads, locking extended 'manual operator mode'.

Thanks for all the help, I am open to suggestions for troubleshooting!

Seb

 

when my car was on joes dyno, we had to use a similar solenoid(aem) and i dont think the vacum lines were routed the same as yours.

you have a 12v key on going to one side of your sol. and the other side goes to the ecu boost control output ?

 

correct The boost control used to work just fine, but the last time I took it out it was not working. The only change I did was activate the Aux output on A11 for fan control. I have A11 going to one side of a the coil on a relay, with +12v on the other side of the coil. Then +12v waiting to go to the radiator fan on the other pins.

The vac lines are as follows:
compressor + boost solenoid to WG side port
boost solenoid top WG port

Here is another picture:

 

for some reason i want to say we had the top of the wg hooked to the front port on the solenoid, but it was awhile ago, and its the only time i ever used that type of soleoid/boost controll like that.


do you have another sol. to try out?

 

naw, but I think I will be buying a known good one in a short bit

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaveF &raquo;</TD></TR><TR><TD CLASS="quote">for some reason i want to say we had the top of the wg hooked to the front port on the solenoid, but it was awhile ago, and its the only time i ever used that type of soleoid/boost controll like that.


do you have another sol. to try out?</TD></TR></TABLE>
people usually set theirs up that way for internal wastegate control.

 

What is the right way to setup this solenoid?

I just bought one and I want to know how to set it up