Ford injector driver module circuit testing

FORD INJECTOR DRIVER MODULE CIRCUIT TESTING MANUAL

This is the easiest way to test an injector feeding circuit. You can also test the injector controlling circuit using a noid light.

FORD INJECTOR DRIVER MODULE CIRCUIT TESTING MANUAL

* If the test light remains lit, the device driver in the computer may have failed or there's a problem in the circuit.Р”В¬heck your repair manual for further tests, if necessary. * If this is a dead injector and the power and the pulse signals are present, replace the injector.

This time, the test light should flash, meaning the injector is receiving the pulse signal from the computer to open and close the injector.

If you can't back probe the wire, insert a pin through the wire and use the pin to probe the wire.

Back probe the opposite wire on the fuel injector connector (this is the pulse signal coming from the computer).

Have an assistant crank or start the engine.

Now, plug back the harness connector to the fuel injector and hook the test light clip to the positive side of the battery.

Check the power side of the circuit for a short, blown fuse, or bad connection along the circuit, including the computer. If the test light doesn't glow, you've found the problem. One of the terminals should make the test light glow, this is the injector power source coming from the computer.

Touch the terminals (one at a time) of the harness connector with the test light.

Turn the ignition switch to the ON position.

Unplug the electrical connector from the fuel injector you want to test.

First, hook the test-light clip to a bolt or bare metal bracket on the engine.

You can check for power and pulse signal as it comes from the computer on each dead injector using a test light, an inexpensive an efficient tool.

Repeat this test on each injector and take note of dead injectors, so that you can test them in the following section.Р”В¬hecking the Injector Controlling Circuit.If you don't hear the clicking sound, either the solenoid has failed or the computer isn't sending the pulse signal. The sound comes from the solenoid inside the injector activating and deactivating the injector's valve. When the injector opens and closes, you can hear a clicking sound.

If you decided to use a long screwdriver, place the tip of the screwdriver against the body of the injector and the end of the tool's handle against your ear.

Place the earpiece of the stethoscope on your ears and the tip of the tool against the side of the injector.

Apply the parking brake and open the hood.

However, a long standard screwdriver or even a piece of thin hose of the appropriate length will work just as well.

To listen to the injector, you can use a mechanic's stethoscope, an inexpensive tool you can buy at most auto parts stores.

Ford injector driver module circuit testing