Clarity on wiring up E1, E7 & E8

[Muu]

Hi

Just building a swap loom up and I'm a little bamboozled by some of the info around the PGM-FI relay, I'm sure it's simple just want to be sure as the following warning is scary enough:

Do not wire the main relay (E7) or fuel pump (E1) to 12V. This will damage the ECU. Both E1 and E7 are outputs which switch on relays by grounding the ECU output and do not like being forced to eat 12V.

The hondata diagram here shows E7 being fed by pin 86 of the main relay, with 85 hooked up to constant 12v? E1 is also fed 12v from the main relay output via the fuel pump relay coil. Finally the factory diagram (11-42) shows E1 & 7 being grounded via transistor inside the case.

So I'm at a loss as to what to make of the warning?

Cheers,

T

[Hondata]

I do not see any different between our statement and your observations. Both E1 and E7 are current sinks, and should not be wired to power, which is what a huge number of people do with engine swaps.

[Muu]

Ok so I'm clear now, it was as I thought. It's the relay coil gnd, which means 12v will be going to it when the main relay is on but it's not being fed constant 12v.