92 Toyota pickup, was blowing efi fuse now its not but when I turn the key it doesn't do anything
A bad short blowing the fuse. Could be in the wiring for that circuit, or bad part, component (like the computer, sometimes a shorted injector).
Check if the fuse still has power to it. Use a test light to check for power at the fuse. If no power, probably blew a fusible link or maxi fuse that is the feed for that fuse block.
Turn key to on-do the warning lights and dash gauges come on? If not, check that power is still getting to the ignition switch. I think there are fuses (AM1 &2?) for the ignition switch, not fusible links.
Shorts in the wiring can be difficult to find, may be buried deep in a wiring harness, one needs to check continuity of wiring to locate wiring shorts, looking for high resistance in a section of wire-you may need a shop to diagnose. If you have a wiring diagram available, could start checking wiring and parts in that circuit.
If you want to get creative, here is how an auto electrician can hunt for shorts: use some jumper wires and hook up a circuit breaker of same rating as the efi fuse in that fuse slot. Now when testing you will not be constantly blowing the fuse-circuit breaker will reset every time. Unhook parts in the circuit one at a time, turn key on so power is going through the circuit, whatever part is unplugged that breaker does not trip, that is the problem-the wiring to it or the part itself. Also do a wiggle test of the wiring: key on, move different parts of the wiring and harness, if you cause the short tripping the breaker (or blowing the fuse if you just keep adding a new fuse each time) then you have found the short.
Here's a heads up: anytime you want to pull the connectors off of the computer, make sure key is off, remove negative battery terminal, pull connectors off the computer, reattach the negative battery terminal. With connectors off examine connector pins for any corrosion or bent pins.
Good luck, get power back to the ignition switch if it is lost, then start looking for what is blowing the efi fuse.
Sep 01, 2013 |
1990 Toyota 4Runner