Start and die after wiring changes

[astro932]

so long story short I have been working on simplifying the harness under the dash... got it back in and now it starts and runs for a second and then dies, itll start again and run even shorter.. does any one know what nissan does with their bus? I removed a few bus lines and normally thats not an issue but seems like in this case it might be. if any one has any ideas or some information that would be grerat

[crazy4oldcars]

Why in the hell....?
Nevermind. Just.....Nevermind.

Kirk B.

[DOOMMONKEY777]

Originally Posted by astro932

so long story short I have been working on simplifying the harness under the dash... got it back in and now it starts and runs for a second and then dies, itll start again and run even shorter.. does any one know what nissan does with their bus? I removed a few bus lines and normally thats not an issue but seems like in this case it might be. if any one has any ideas or some information that would be grerat

Put it back the way it was.......probably fuel pump. With out starting the car when you press power ON, do you hear the pump prime behind pass seat??? Remove the cover and fiber glass cover to hear it better.

[astro932]

Originally Posted by DOOMMONKEY777

Put it back the way it was.......probably fuel pump. With out starting the car when you press power ON, do you hear the pump prime behind pass seat??? Remove the cover and fiber glass cover to hear it better.

hahaha yaaa I depinned the things I took out and as there is no interior yes I can hear the pump prime both before starting and after it dies it reprimes, Im going to see this week (need to grab a few more things from my box at work) what its killing, I think the ecu is cutting fuel

[SouthArk370Z]

Originally Posted by astro932

... I have been working on simplifying the harness ...

There may be a few wires that aren't used in the harnesses but you really have to know what you're doing before you start re-wiring things. If "bus lines" refers to the CAN bus, you need to put them back so the different modules can communicate with each other.

[astro932]

Originally Posted by SouthArk370Z

There may be a few wires that aren't used in the harnesses but you really have to know what you're doing before you start re-wiring things. If "bus lines" refers to the CAN bus, you need to put them back so the different modules can communicate with each other.

I guess I need to be more clear or perhaps not look for any ideas here. I do know what I am doing mostly, I know what wire go to what I know color coding and pin number what I dont know is if the interior can needs to see the srs or not, I know the bus didnt need the radio to run as I drove it before with no issue... I know how can works I just have zero access to nissan info on what the ecu and bcm needs, I have all wiring diagrams and functions as well as pinouts... Im not new to this but they do it way differently than benz so it can be challenging to know what it needs

[SouthArk370Z]

Originally Posted by astro932

... I know how can works I just have zero access to nissan info on what the ecu and bcm needs, ...

The descriptions (and other parts) of the FSM usually tell you which module(s) generates messages on the bus and which module(s) is looking for them.

[astro932]

so just thought Id update, I have a full harness in again and srs back in and still no go. need to get a real scan tool and clear the car out and the I hope it goes back to normal... then hopefully i can tune it out...hopefully... I dont know of anyone running a standalone on the vq37

[astro932]

TiL the z wont start with the accelerator pedal un plugged... wow im dumb

[lj909]

Get in touch with VitViper.
He has a fully operational MoTec unit for VQ37VHR