Quote:
Originally Posted by JRMichler
Definitely kill the injectors, not the ignition. Here's how I did my kill switch:
The kill switch was installed 12-7-2008. It breaks the connection through the fuel injector fuse to kill the engine. I cut the plastic off a spare fuse, removed the fuse element, and soldered wires to the fuse pins. These wires were connected to an automotive relay. The relay coil is energized through a pushbutton switch mounted on the shift lever. The relay is connected normally closed, so the circuit is opened when the relay coil is energized. The fuel injector circuit has an inline fuse, with another inline fuse in the wire to the pushbutton. I can bypass the kill switch any time by pulling the connectors from the fuse box and putting a fuse back in. All wires are protected by fuses. This is especially important when running wires through the firewall, under carpeting, and up the shift lever.
The kill switch works well, however I randomly get a CEL. The CEL is either a P0204 or P0461. I just reset using the Scangauge. Strangely, I always get a CEL at the first EOC after filling the tank. That CEL is also accompanied by the gas gauge moving to Empty. The gas gauge stays at empty until the CEL is reset. The BCM also relocks all the door locks every time at a bump start.
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I did something similar enough. I cut the fuse open, put 2 butt slices on the end, crimped, ran wire into the car through the fender/door and put an inline mini fuse holder for the 15a fuse. I then, for testing purposes, connected a switch rated for 6A to see how it worked. Works well, and I can see it being useful for when coasting to a light and wanting to use engine braking down to ~300 RPM(I have to guess at RPM though as the Tercel doesn't have a tachometer and my OBD2 port is occupied by insurance company tool(****ing insurance rates in Ontario are ridiculous, I'm 20 and paying over 270/mo)).
I now need to find a switch to permanently install. I'm leaning towards a normal throw switch because of the whole coasting to lights thing as opposed to a momentary switch. Any suggestions regarding switches?
Also, regarding relays. I don't have much experience with them but I assume you hooked up the switch to a hot wire you got from the cabin and ran that to the relay and from there to a ground?