How much voltage does the ECM supply to the injector?
These known good waveforms have the following characteristics: When the injector is off, the ECM supplies 4 to 5 V to both sides of the injector circuit. The ECM switches on the injector by simultaneously supplying a boosted 40 V to the positive feed side Channel A, and a path to earth, 0 V, on the switched earth side Channel B.
What is the voltage and current of the injector?
Injector feed and switched earth voltages and circuit current during engine overrun conditions. These known good waveforms have the following characteristics: When the injector is off, the ECM supplies 4 to 5 V to both sides of the injector circuit.
How can I Check my ECM ground circuit?
Disconnect the ECM harness connectors. Using a 12-volt test light connected to 12-volts, check each of the ECM ground circuits in ECM harness connector. Did the test light illuminate for each cavity?
Is there such a thing as a positive injector circuit?
This type of injector circuit is called negative trigger. There are, however, a few (European) manufacturers that have used positive or battery voltage trigger injector circuitry in the past. With positive injector trigger, the positive side is the one being triggered by the ECM.
What should the voltage be on a fuel injector?
The wiring harness will have two terminals that the prongs on the injector insert into. One will be connected to ground and will read 0 volts. The other should read around 12 volts. Step 5: Repeat with all injector wiring harnesses. Leave the ground lead in position and test all of your injector wiring harnesses. They should all be around 12 volts.
How many wires should be on a PCM injector?
There should only be two wires on each injector, one hot wire and one that seeks ground through the PCM. The hot wire should be the same color to all injectors, but the ground seeking wire should be a different color for each injector.
Where is the ECM located on an F150?
The ECM is located on the right side of the engine compartment behind the battery. (As you can see in the photo, the battery has to be removed to gain access to the ECM’s connector.) This is how the voltage drop test was done:
How is an injector related to an electric field?
An injector is a coil, from an electrical point of view. A coil that has a voltage applied to it and then when you turn it off, it fights to sustain its electric field. It wants to retain that charge and as the field collapses, it generates a fairly large very fast pulse of the opposite polarity (a phenomena called “Back EMF”).