Recently I was so lucky to get hold on a beautiful 1990 HJ60, my dream car for a long, long time.
As with many I have trouble with my Fuel control / EDIC relay.
There are used relay to be bought, some reproduction replacement to be bought, but I am not quite happy with either solution. Used is risky and the replacement requires a harness swap and is still a mechanical relay.
Being an electronics engineer, I wish to replace the relay with a solid state version to hopefully increase the reliability and as a project to entertain myself.
The reason behind this post is to try to figure out if there is a wish / need for a solid state replacement for others out there?
I do not plan on making much if any profit, and I will probably make it open source, but it is an significant increase of work to make sure others can use the design instead of a one off for myself.
I am quite fond of projects and would like to do it, but if it is only for my car I will probably just remove the relays and add some simple transistor logic on the original pcb.
Playing around with the idea one could think the following possibilities:
1)
Original look:
Open up the relay and remove the old pcb, move over the old wire harness with the connector.
This requires soldering and a bit of work, but one could toy with the idea of supplying a replacement relay with a deposit until your old one is returned, then it would be plug and play for the end user.
2)
New replacement relay:
New relay molded in conformal molding to avoid any moisture ingress, new connector on harness, requires a change of the harness connector in the car.
The original connector could be badly corroded, then the above solution would take care of both problems.
3)
As above but with a reproduction connector for a plug and play solution.
It would be easy to make a 12v and 24v compatible version requiring no change for either voltage, but I do not know of how many other relays there are need for? It might be possible to make one design that is easy to configure for several version, i.e cheaper.
I have the 28590-56100 with three relays inside. I know I have seen photos of others with two relays inside etc. If I am to do this I will need some help for sure to figure out what the need is.
As with many I have trouble with my Fuel control / EDIC relay.
There are used relay to be bought, some reproduction replacement to be bought, but I am not quite happy with either solution. Used is risky and the replacement requires a harness swap and is still a mechanical relay.
Being an electronics engineer, I wish to replace the relay with a solid state version to hopefully increase the reliability and as a project to entertain myself.
The reason behind this post is to try to figure out if there is a wish / need for a solid state replacement for others out there?
I do not plan on making much if any profit, and I will probably make it open source, but it is an significant increase of work to make sure others can use the design instead of a one off for myself.
I am quite fond of projects and would like to do it, but if it is only for my car I will probably just remove the relays and add some simple transistor logic on the original pcb.
Playing around with the idea one could think the following possibilities:
1)
Original look:
Open up the relay and remove the old pcb, move over the old wire harness with the connector.
This requires soldering and a bit of work, but one could toy with the idea of supplying a replacement relay with a deposit until your old one is returned, then it would be plug and play for the end user.
2)
New replacement relay:
New relay molded in conformal molding to avoid any moisture ingress, new connector on harness, requires a change of the harness connector in the car.
The original connector could be badly corroded, then the above solution would take care of both problems.
3)
As above but with a reproduction connector for a plug and play solution.
It would be easy to make a 12v and 24v compatible version requiring no change for either voltage, but I do not know of how many other relays there are need for? It might be possible to make one design that is easy to configure for several version, i.e cheaper.
I have the 28590-56100 with three relays inside. I know I have seen photos of others with two relays inside etc. If I am to do this I will need some help for sure to figure out what the need is.