1986 Corolla GT-S Fuel Injectors Not Firing
Here's how to check the injector circuit.
Pull off one injector connector and with a testlight grounded on the engine, turn key to on. Probe the terminals of the injector connector. One of the terminals should have steady power from the ignition being on. If neither terminal turns on the testlight, the injector drive circuit is not working. There may be a fuse for the injectors out. Also check the efi fuse, located I think under the hood. If still no good, you will have to check the circuit from the ignition switch to the injectors.
If you got a steady light from one terminal, the drive circuit is good. Now check the ground circuit: Put the lead of the testlight on the positive battery post, and put the probe of the testlight into the injector terminal that did not light up.Someone will have to crank the car over for you. If the testlight is blinking when the car is being cranked, the injector circuit is working right. The blinking light means the computer is properly grounding the injector circuit to fire the injectors. The ground circuit leads direcdtly from the injectors to the computer. When the computer internally grounds that injector, the injector will pulse, or fire. Good luck, and I hope you find the problem.
Mar 29, 2012 |
Toyota Corolla Cars & Trucks