Car keeps blowing the efi fuse 15 and fuel pump wont run
I surmise you have a shorted fuel injector or injector driver transistor. The engine computer probably knows something is wrong and is not turning on the fuel pump relay as a safety measure. You will need a digital multimeter or a VOM to track down the problem.
Remove the EFI fuse, turn the ignition to ON, but don't start the engine. Measure the voltage between ground and each terminal of the EFI fuseholder. You will make the following tests at the terminal that does NOT have 12 Volts on it (fuse output). Turn off the ignition and disconnect the battery.
Measure the resistance from the fuse output terminal. It will probably be much less than 1 Ohm. The next thing is to check the fuel injectors. Disconnect the injectors one at a time and check the resistance . If the resistance suddenly increases substantially more on one injector than it does when the others are unplugged, you've found the culprit. Now you need to check the injector driver transistor. One of the wires to the injector is 12 V from the fuse output and the other goes to the transistor. Check the resistance to ground. If it is 0 or close to it, the transistor is fried, and the EFI module (or engine computer if it is contained there) will need to be repaired or replaced. Also, compare the resistance of the suspect injector with the others. If it is substantially less, the injector coil is bad (a failure in one part can ruin the other, so check both).
Nov 18, 2010 |
1991 Toyota Celica