Crown ECU /Fuel Pump Question

[Quadcob]

Just completed the wiring of the wiring looms in a ICV I am building and it started pretty well first go. They only problem I have is that I can not get the fuel pump to work through the ECU. I followed the drawings that are available from this site.
The drawing I used has the has the fuel pump relay powered(ve+) from the ECU. The other drawing from this site I checked has the ECU as the ve- from the relay.
Before I start stripping the down the harness and rewiring it can anyone who has wired a motor from a Crown and used its ECU to control the fuel pump tell me how they wired it in.

Thanks
Warren

 

[Clown Boy]

Note: I have no knowledge on this topic whatsoever.

BUT the guy doing my loom told me that in the later model ECUs the fuel pump is controlled by an external computer that is in the rear of the vehicle (and thus is usually chopped off anf not included with the front cut.

He has built his own replacement.

Is it possible that you are missing this module?

 

[Quadcob]

Clown Boy,

From all the information I have read the Crown ECU does not require a seperate module to run the fuel pump.

 

[Zuffen]

Quadcob,

I'll be working on my car tonight and I'l have a look for you.

The Crown doesn't use a fuel pump ECU but it deoes use a fuel pump speed resistor.

 

[Clown Boy]

Sorry about that. Was the module I am referring to another ECU that does not apply here or did I get it totally wrong and it is a resister?

 

[Zuffen]

The Crown uses a resistor. It's silver and about 100mm x 75mm x 35mm and is located on the front skirt in front of the engine bay fuse box.

The SC/Soarer/LS all use a separate fuel pump ECU.

 

[webbie]

Quick picy of what Zuffen is talking about.

 

[Quadcob]

After trying unsuccessfully to get the fuel pump to work via the ECU I gave up and fitted a LPG Safety Cutoff relay to control the fuel pump relay. It was simple to wire up and works well.

Warren

 

[Peewee]

Depends what model Crown it is.

The UZS131 and UZS141 will use the relay.
The UZS151 and UZS161 will require a fuel pump ecu.

 

[Quadcob]

The motor is from a UZS131

 

[Loroh]

LOL.... I always wondered what that thing was for, now I know.

I'll have to go fish it out of the box in my shed full of all the other left over stuff.

All I did was hook my fuel pump up to the acc witch works fine. But at idle it's still at 12v witch is a bit noisy.

 

[sideshow]

early crown 1uzs have a neg trigger for a circuit opening relay

did u run this relay or a normal relay

sometimes the f/pnt enough to tri a normal relay you have to use a circuit openin relay which gets trigger when cranking and then the f/pp neg trig just holds it one

have run into this prob before

another thing i use is a tachometric relay
these triger relays when there is an rpm signal
very easy to use

late model 1uzs and soarer 1uzs run a fuel pump ecu

i have all parts here needed to wire these up whichever way u want

 

[Quadcob]

Hi Sideshow,
I just used normal relays. Explains why I couldn't get it to work.

The LPG safety cutout works like a tachometric relay. When it is first energised it sends a signal to the fuel pump relay for one second for an initial prime and then stops. It then turns on when it gets a signal that the engine rotating. If the engine stops and the igniton is still on it will shut down the fuel pump relay. Like I said before, easy to wire up and get working and is effective.

Warren

 

[sideshow]

yes i buy 20 of gas shut off relays at a time
use them regularly

 

[Quadcob]

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