URGENT! R34 - ECU Diagnostics and Codes

[choyda]

Hi,

Today, I noticed that i left home with over 1/4 tank of fuel left and about 10kms away, i got the fuel light coming on and could notice the gauge moving. I pulled into the closest servo and checked for a leak - none. I checked for excess fuel consumption (fuel out the zorst) but it was clean. I filled up as much as possible and it would only fill 31L in the 65L tank. The car is performing as normal and theres no fuel pouring out the exhaust on or off boost.

I believe it may be something wrong with the sensor but would like to check. I have spoken to another R34 owner and he said that a similar issue occured but was a once off. I think mine is also a once off issue cos the car was going fine and the gauge was working normally after filling.

Utlimately, I would like to know if anyone has ideas on why this happened or if somone knows how to set an R34 GT-T 2door manual into diagnostic mode and knows what the codes are. I will mention that it was about 32 degrees outside.

[choyda]

The fuel gauge has occurred again. I'm using the trip meter as my fuel gauge for the moment. It seems that once the tank hits about half way, the gauge drops quickly to empty. Restarting the car temporarily fixes the issue but then the needle starts going down.

Does anyone know if resetting the ECU is going to help or if there is someone in Brisbane who would be able to fix this?

[ecl]

well u can try resetting the ecu

wouldnt hurt and theres nothing to lose

can be done in 10seconds

uplug -ve of battery

step on brakes/turn on headlights

replug -ve of battery

off you go

[The Dan]

You can short two of the terminals on the diagnostic connector to get it into diagnostic mode. It will flash the engine check light and you can count the error code. I doubt it will log a code but you never know. Try pulling out the fuel pump and inspecting the sender unit. See if there is anything obviously wrong with it.

[choyda]

I'd say its a gauge issue only cos theirs no excess fuel/lack of fuel and performance is as per normal. I drove 35km on empty (with the warning light on).

I will give the ECU reset a go.

[The Dan]

35 is nothing. When mine was standard I used to be able to 90 after the light came on. But off topic sorry.

I'll find out the pins to short to get diagnostic mode and get back to you.

[The Dan]

couldn't find anything as yet but am still looking.

[wrxhoon]

The problen is most likely the sender unit in your tank .

Pull the pump out then plug it back in , operate the float and watch the gauge .

You mabe able to clean the contacts on the sender unit and fix the problen otherwise a new sender unit .