Dandy. Happy I could be of help, (not). The more common cause is the wiring to the oxygen sensors falls down onto hot exhaust parts, the insulation melts, and the heater wire shorts to ground. That is another circuit that comes off the ASD relay.
For future reference, here's a trick that will help you avoid wasting so many fuses:
A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.
With the ASD relay, it only gets turned on for one second when the ignition switch is turned on. Obviously that's not enough time to do any troubleshooting. It turns on again during engine rotation, (cranking or running), so that isn't practical either. To allow you to power up the circuit to diagnose it, it's easiest to bypass the relay. You don't even need the ignition switch on. Jump terminals 30 and 87 together. The things on that circuit are the ignition coil pack, injectors, alternator field, oxygen sensor heaters, and fuel pump or pump relay. The feed wire to all of them is a dark green / orange wire.
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Saturday, August 9th, 2014 AT 12:15 AM
