I'm doing a compression test and I just know i'll never get the HDS software working because I'm a cursed old luddite. Will pulling the EFI fuse stop the injectors and accomplish the same thing as selecting ALL INJECTORS STOP in the PGM-FI, INSPECTION menu with the HDS?

I'd rather not have residual fuel pressure putting fuel into the cylinders if all that does is stop the fuel pump.

 

Yes, pull the main and back-up ECU fuses and no injectors will fire... nor will the ignition system.

 

i still need the starter motor etc. in order to perform the compression test, will that not disable all of it?

do you mean #6 ECU FR in the Passenger Side Engine Compartment Fuse Box as well as #20 ECU AS in the Passenger Side Cabin Fuse Box?

 

The starter circuit will function when the fuses are pulled. I am not sure of the fuse location numbers, but they are both in the "under hood/engine bay" fuse box and are the 15A and 7.5A next to each other... closest to the firewall and the fender. If you are not sure, you can always unplug the ECU from the cabin harness... this creates the same result.

 

it's a keyless ignition. you sure the push button start is going to work? or will a bump starter trigger work?

 

This will depend on how your vehicle is wired. A trigger directly on the starter will work if your stock ignition system does not.

 

well, looking at the the wiring diagrams, it does like pulling the main FI relay will in fact interrupt one of the conductors going to the injectors, but the way that it's all daisy chained to the sub relay and other circuits, it doesn't give me an unambiguous indication that the injectors won't be able to power through that orange wire that seems to be going everywhere. am I reading this right?

also, has anyone actually done this who can confirm for me that the ecu isn't going to need reprogramming after the test is done because it thinks the injectors are miscalibrated or something?

 

If the wiring diagram leaves you thinking that you may still get fuel injector pulses when attempting to crank the engine over... simply unplug each fuel injector clip on the engine harness from all four fuel injectors themselves. You may get a "fuel injector" code when using this method, but this can easily be rectified by clearing the codes when you are finished testing.

 

clear it with just an ordinary obd2 code reader? no hds required?

 

Yes, a simple code reader should suffice. HDS is not required.

 

hmm...looks like unplugging the injectors requires taking the intake plenum off. 4th gen Odyssey. is that what you are suggesting? i don't think they're gonna let me do that.

 

Hmmm... I didn't pay close enough attention to your wiring diagram and thus, didn't realize that you are working with a 6 cylinder. So, ignore the injector unplug and the fuse locations because the info that I gave is either incorrect or difficult to perform.

I suggest you unplug the immobilizer plug on the box that surrounds the key slot on the column. This will cut fuel and ignition while attempting to start.

 

Keyless/push button start. (EX-L) no key slot.

 

Oh for heavens sake... Year, Make, Model, Trim Level, Engine Size, Transmission please.

 

sorry, i for some reason thought I'd already said it. 2016 Honda Odyssey EX-L 3.5L w/6 speed. thank you for keeping it G rated.