VEMS Community Forum

Technical => Wiring & Sensors => Topic started by: smurfinator on July 17, 2014, 08:41:33 pm

Title: Fuel pump ignores shutoff parameters
Post by: smurfinator on July 17, 2014, 08:41:33 pm

I have had this car running for some years now, and sometimes when I turned on the ignition, the fuel pump would ignore the parameter to shut off after 2 seconds of no engine cycles.

Now I have rewired the entire thing to a very meticulous degree and the fuel pump NEVER shuts off after 2 seconds of no engine cycles.

I have checked and re-done all grounds and so on and so forth.  I even put in a new p259 chip.  The fan trigger and manifold trigger are on p259 and working.  I have moved the fuel pump trigger to a spare p259 and had the same problem.  Used a new relay for it....

What could cause this problem?

Thanks!

Title: Re: Fuel pump ignores shutoff parameters
Post by: mattias on July 18, 2014, 01:45:46 pm

Move the fuel pump relay control to a free driver for ignition or fuel injection.

In fac don't use the P259 for relays, in my experience it can and will break regardless of grounding and circumstances.

Title: Re: Fuel pump ignores shutoff parameters
Post by: smurfinator on July 18, 2014, 09:22:27 pm

Quote from: mattias on July 18, 2014, 01:45:46 pm

Move the fuel pump relay control to a free driver for ignition or fuel injection.

In fac don't use the P259 for relays, in my experience it can and will break regardless of grounding and circumstances.

Thanks, I tried to use a stepper out and the fuel pump would run on ign-on but then turn off when the engine ran(!)

I'm also having a problem where I can't calibrate my new Oxygen sensor because terminal quits working after successful Man command...


Could all of this be related to the Belkin USB/serial converter I'm using?  I notice that the fuel pump on p259 seems to act normal when my laptop is not plugged into the belkin cable converter.

Thanks in advance!

Title: Re: Fuel pump ignores shutoff parameters
Post by: smurfinator on July 19, 2014, 03:32:45 am

Ok it seems like nothing works as it should when the laptop is hooked up to the VEMS with the belkin usb/serial dongle.  p250 channels seem to conflict or all run at the same time.  Stepper channel turns off when it should turn on. 

Is this normal?

Title: Re: Fuel pump ignores shutoff parameters
Post by: mattias on July 19, 2014, 06:28:10 am

Download latest/unstable VemsTune. Upgrade firmware. Start from there.

Title: Re: Fuel pump ignores shutoff parameters
Post by: smurfinator on July 20, 2014, 03:32:18 am

Quote from: mattias on July 19, 2014, 06:28:10 am

Download latest/unstable VemsTune. Upgrade firmware. Start from there.

I appreciate the need for that, but it is WAY too big of a change for me to deal with right now.  I am 7 years behind on update because the car just ran fine all that time and I need to nail down these simple things or determine if the board is fried.

Now, I have moved the fan and fuel pump to 7 amp output and they STILL do not behave correctly.  I may not have those FETS installed, it actually occurs to me.  Myt board is 8 years old I think. 

But I know I have a Stepper chip and they didn't work with that either.  Stupid question:  To run relays off the stepper, should I choose channel "i##" instead of channel ## ( no "i").

Thanks!  Is my board fried?  I mean this stuff all used to work :P

Title: Re: Fuel pump ignores shutoff parameters
Post by: smurfinator on July 20, 2014, 03:34:10 am

er, um, so are all of those outputs (stepper, 7amp) a negative (-) supply?

Title: Re: Fuel pump ignores shutoff parameters
Post by: smurfinator on July 24, 2014, 08:55:03 pm

I suspect this problem (topic title) could be related to the Belkin USB/serial converter dongle being connected to the VEMS even though it isn't powered up from the USB side.  Will see soon...