mr2 main efi relay voltage low

[gasman]

Here is a bit of a conundrum that I have at the moment. Speedtech noted that the ecu voltage was sitting at about 12.5V not the recommended 13.8V that it should be getting. I had a quick look around with a multimeter and the main feed off the alternator was 13.8V but the voltage in the main efi relay power circuit was sitting at about 12.5V-13V range. The main efi relay is more or less connected directly to the same power bus as the alternator through a 15A fuse.

I checked the resistance to and from the efi relay and the alternator power and they are all quite low and what I would expect from a straight piece of wire, so I then proceeded to pull apart the main efi relay and found nothing unusual there apart from not being able to put it back together properly, but that’s not a big deal.

Checked the resistance to, from and across the efi fuse and that’s all normal.

So where is this ~1V voltage drop between the power buss and the main efi circuit coming from?

has anyone else had a similar problem?

[sergei]

what are you checking voltage against?

[gasman]

one of the strut bolts, and also checked the voltage drop dircety across the alternator feed to one of the efi main relay wires powering the idle control valve.