GU1 Sub Tank Switch

[the evil twin]

Sorry, what is IIRC?

If I Recall Correctly

[the evil twin]

I will try the battery disconnect fix before trying diagnostic mode tomorrow. I don't think I tried that after i tried the battery. I just saw the light still on and went bavk inside to mope around

Good idea... if the fault is still there the lamp will illuminate again after the sub tank computer does it's self test.
If the fault is gone then, voila, all OK

[NotTortoise]

Cool, so is the 15-30 minutes about the right ammount of time to have the batteries disconnected?

[the evil twin]

Cool, so is the 15-30 minutes about the right ammount of time to have the batteries disconnected?

Yeah should be.

[NotTortoise]

Ok.

So I went and bought an led to try bypassing the light in the switch, thought that I should re-do all of my checks just in case and get my head back into the game.

All tested the same as yesterday except for my last test, earthing pin 4... it worked! And after it worked. So, I turned the car off and suddenly I could get it into self diagnostic mode 1st try.

The dash light is still on and my code flashed as #13 "Sub fuel pump power supply circuit".

Fun and games, forgetting for the moment, that this is starting to look more and more like a gremlin, I am now looking through the wiring diagram to see where I should test next.

Is this the type of thing that could be potentially rectified by adding a 2nd earth from the sub tank to the chassis? If i do need to add one do I have to use a different location both on the tank and chassis from the original earth cable?

Thanks for the knowledge and assistance so far you guys are really invaluable help,

Cam

[NotTortoise]

First thing, I have disconnected the battery and we will see what happens...

[NotTortoise]

IT WORKS!!!

I am just going to ignore the fact that it didn't work and just be happy that it works now.

Yay!!!

I can't thank the evil twin and Yendor enough, you guys are incredibly knowledgeable and helpful.

Thank you, thank you, thank you.

Cam

[Yendor]

There isn't an earth strap fitted to the chassis from factory. You need to do this first and then see if problem occurs. It doesn't really matter where you fit the extra earth strap as long as it connects to the chassis.

You can connect it near the fuel tank, or from the negative battery post to the chassis or as Nissan recommend connect it between the body and chassis under the front passengers floor.

After you have installed the earth strap disconnect the battery again and see how it goes.

Edit: Just noticed your post above. I still recommend that you fit the extra earth strap.

[the evil twin]

X2 with Rodney... fit that earth strap anyway

It should hopefully stop that and other earthing gremlins

PS... glad we could help, makes my day actually, not having very many other sparky wins at the moment

[Yendor]

I'll give you a choccy frog ET