Kpro wiring

[salsa]

http://www.hondata.com/techk20wiring.html
I am using this^ page to modify an existing wiring harness (non-honda)and the sentence below is confusing to me.

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.



Constant 12V fused "ECU" is going into the main relay coil 85 and is coming out to 86 then to E7. Is this correct? Does the coil drop the voltage enough or is this supplied from the ECU somewhere? Can you please explain.

[salsa]

This is what I have come up with.

[Hondata]

E1 and E7 and both open collector outputs. Many people wire them to +12V directly, which burns out the ECU.

Why not just copy the wiring diagram which is known to work?

[salsa]

E1 and E7 and both open collector outputs. Many people wire them to +12V directly, which burns out the ECU.

Why not just copy the wiring diagram which is known to work?

IF you trace out my diagram it should be the exact same as the Hondata one. I was just curious about the 12v going into the main relay @ 85 and coming out @ 86. What kind of voltage would E7 and E1 see? What is the resistance of the relay coils so I can calculate the voltage drop?

I have toyota relays and Im wondering if those will work.

[Hondata]

I can't tell if the wiring is the same because the image is too low resolution. In my experience it is quicker and less trouble to add the three relays than try to use the factory wiring.

The voltage at E7 should be close to battery voltage - the coil resistance is much less than the ECU keep alive power draw.