Help me kill my fickle woman...

[jimmylomax]

I can give it a whirl. Sorry if I'm being dense and/or stubborn - I guess I'm a little hesitant to start pulling wires just yet without understanding quite what I'm doing.

Which wire, then, are you suggesting I pull from the ECM? Based on the diagram you linked in post 7, it seems to me that the Yellow/Black Wires are actually powering the ECM itself downstream of the PGM-FI 1 Relay. I downloaded an ECM/PCM pinout, but for the life of me cannot find the link. I found the two yellow/black wires at the ECM - so I'm willing to try yanking them.

I anticipate I'll get the same issues as this guy, "P0685, which is "ECM/PCM Power Relay Control Circuit/Open.""
hondafitforums.com/showthread.php?t=716

[Weather Spotter]

You need to find the wire diagram for your car, each is different. If you have a ECU Pin out ill be happy to look it over with you and help find the wire

you will love having a kill switch.

[jimmylomax]

I bought a 2008 Honda Fit.

Here is the ECM pin-out diagram:
fitfreak.net/forums/fit-engine-modifications-motor-swaps-ecu-tuning/24616-ecu-diagram.html#post297286

Here is the same link to the fuel system wiring schematic you shared in post 7 of this thread where you said, "you want to add your relay in line with the yellow/black wire after it combines the injectors but before it merges with anything else."
hondafitjazz.com/manual/A00/HTML/00/SAA2E00000000000000EBAT00i019.HTML

[jimmylomax]

Originally Posted by Weather Spotter

You need to find the wire diagram for your car, each is different.

I bought a 2008 Honda Fit.

Here is the PCM pin-out:
fitfreak.net/forums/fit-engine-modifications-motor-swaps-ecu-tuning/24616-ecu-diagram.html#post297286

Here is the wiring schematic for the subsystem we need which you linked in post 7 of this thread which I believe is the appropriate one:
hondafitjazz.com/manual/A00/HTML/00/SAA2E00000000000000EBAT00i019.HTML

[jimmylomax]

grrr - my last two posts were blocked. I need to hammer out a couple more so I can link.

[jimmylomax]

yay 5 posts. I'm a big boy now.

[jimmylomax]

Originally Posted by Weather Spotter

You need to find the wire diagram for your car, each is different. If you have a ECU Pin out ill be happy to look it over with you and help find the wire
.

It is a 2008 Honda Fit Sport – same as OP

Originally Posted by Weather Spotter

try this diagram:
Wiring Diagram
you want to add your relay in line with the yellow/black wire after it combines the injectors but before it merges with anything else.

I believe this link which you shared is the correct electrical subsystem schematic

Originally Posted by Weather Spotter

if you look at the diagram posted above, it you cut the wire not in the spot listed you will kill the whole fuel system, not just the injectors. you also kill power to the immobilizer and then need to cycle the ecu. just killing the injectors will not cause the issues listed by vman455.

I think this is probably a wise statement from a wise man


Here is the PCM pinout:
ECU Diagram - Unofficial Honda FIT Forums

edit: and here is the marked up photo I took yesterday showing the intake manifold and injector harness junction where I'm thinking of going Edward Scissor-Hands.

[Fat Charlie]

Does the 1st gen Fit have a fuse that's specific to the injectors? My kill switch has been back burnered all to hell, but it involves breaking the circuit with a Fuse Buddy. My post is #106:

Kill Switch (EOC): Where did you install your activator? And what did you use?

[Weather Spotter]

I would not do it in the engine compartment, the heat and water will short out your mod. if you back the wire bundle back through the fire wall the same wire should be avalable for cutting.

[Weather Spotter]

just re read the thread.... yes the diagram posted looks like the right one. post #8 has the spot marked that you need. and for your car it does look like the engine bay might be your best bet.