How does the PCM control the fuel injectors?
Based on the cranks sensor signal, the PCM grounds the injector to allow the injector to inject fuel into the cylinder. It makes and breaks the ground many times per second to allow the proper amount of fuel into the cylinder. helpful? That sounds fine, but the wiring diagram in the shop manual does not match that at all.
How do you test a fuel injector circuit?
Injector Circuit Power Test With the key in the on position use a test light or voltmeter connected to the negative side of the battery. Gently probe both sides of the injector wiring connector, one of the wires should react by registering around 12 volts on the meter or illuminating the test light.
How many volts should an injector wire be?
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. A lower reading means there is excess resistance in the wire somewhere.
How are fuel injectors attached to the fuel rail?
Learn to test and analyze automotive fuel injector circuits from a wiring diagram perspective. Fuel injectors are attached to the fuel rail. It is very time consuming to detect and prove a clogged fuel injector. The technician needs to disassemble the fuel rail, de-activate the fuel pump and perform lengthy tests to prove the fault.
How to test the wiring on a fuel injector?
How to Test Injector Wiring 1 Electrical Short Testing. Disconnect all the fuel injector electronic plugs on the engine. 2 Voltage Testing. Turn the ignition key to the “On” position. 3 Fuel Injector Resistance Testing. Turn the multimeter to “Ohms.” Place the multimeter leads into the fuel injector plug terminal.
How many connectors does a GM 4.3L PCM have?
The 1996-97 PCM (Powertrain Control Module = Fuel Injection Computer) on your 4.3L, 5.0L or 5.7L Engine has a total of 4 connectors. NOTE: For other PCM pin-out charts, take a look at the following:
How does the fuel injector charge the battery?
Connect the multimeter’s red lead to one of the disconnected plugs. Connect the black multimeter lead to the vehicle battery’s positive terminal. Have an assistant start the engine. The engine rotation will charge the fuel injector electronics plug. As the engine turns, the voltage on the multimeter should alternate between 12 volts and 0 volts.
Why is my fuel injector not working properly?
The electrical connection to the fuel injector may be hampered by shorts in the wiring, inadequate voltage at the injector plug, or incorrect resistance in the fuel injector. Disconnect all the fuel injector electronic plugs on the engine. Set a multimeter to “volts.”
Are there injectors fired in pairs in a 1994 corolla?
@Cougar my 1994 Tercel injectors are fired in pairs. I believe my 1995 Corolla was the same way. I believe that all current cars have sequential injection, though. But you guys are right about the injectors. The PCM provides the ground. UPDATE: Hi, There are no breaks in the injector connector driver (ground) wire to the PCM.
Why does my injector keep switching to ground?
They very likely switch ground as that’s actually easier to do, electronically. If you see power across the coil of that particular injector all the time, you may have a pinched wire that’s now shorted to ground, for instance. More than likely the driver in the computer for that injector has failed.
How are the injectors provided with constant voltage?
The injectors are provided with constant voltage. It’s the job of the computer to ground each injector at the appropriate time thru the drivers in the computer. circuitsmith July 6, 2016, 3:14am #6 With the key off measure the resistance from the low side of the injector to ground. If it’s really low like less than 100 ohms there’s the problem.
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.
Can you change the PCM from a V6 to a V8?
It should fit just fine. You do need to add two additional injector wires to the PCM, and two key hot power wire to the injector connector. Of course you need to change out the large injector connector. The V6 PCM can also be reprogrammed for the V8 engine.
When did the INJECTOR pin change from V6 to V8?
Also if you read the special note above,you’ll know that injector pin assignment changed from 1997 to 1998 for cylinder 1 & 8 on a V8, and 1 & 6 on a V6. So you are putting in a V8 in place of V6 engine.
@Cougar my 1994 Tercel injectors are fired in pairs. I believe my 1995 Corolla was the same way. I believe that all current cars have sequential injection, though. But you guys are right about the injectors. The PCM provides the ground. UPDATE: Hi, There are no breaks in the injector connector driver (ground) wire to the PCM.
What’s the pressure of a diesel injector pump?
Today’s diesel fuel injection pumps are under pressure – even more pressure than what was once considered “normal.” Around 15-20 years ago, it was common for fuel injector pumps to process fuel in a system at around 10,000 to 15,000 psi (pounds per square inch). But that’s only about half of what engines are expected to do today.
Why do I have a problem with my fuel injection pump?
Fuel injection problems, therefore, are one of the most pressing engine issues to deal with. Whether you’ve experienced fuel injector failure or not, it helps to understand the fuel injector pump, how it relates to engine performance, and also how diesel fuel injection pumps differ from traditional gasoline-powered units.
How to solve ” I have no injector pulse “?
An expert that got 5 achievements. Re: I have no injector pulse. I have plenty of fuel… There is an injector fuse. Pull an injector plug , 1 wire should have 12 volts to it. the other goes to the PCM. The PCM is set up so that it has individual injector drivers, Meaning that you could loose 1 or 2, but loosing all 6 at one time is very unlikely.
Based on the cranks sensor signal, the PCM grounds the injector to allow the injector to inject fuel into the cylinder. It makes and breaks the ground many times per second to allow the proper amount of fuel into the cylinder. helpful? That sounds fine, but the wiring diagram in the shop manual does not match that at all.
Is the fuel pump relay controlled by the PCM?
Consequently, the fuel pump relay is usually controlled by, the ignition or powertrain control module (PCM). As a result, when switched on, the fuel pump relay; will provide current to the fuel pump, so that it may function. Therefore, any faults with it, can cause fuel pump issues.
What to do if your Ford PCM is not working?
Without a properly working PCM, the Ford will not run. At times, you may want to perform a reset of the Ford PCM for basic troubleshooting. This can often resolve small issues that you may experience with the Ford. Open the hood of the Ford. Loosen the lock nut located on the negative battery cable connector with a socket and ratchet.
What should I do if my fuel pump is not working?
Use Jumper wires to supply 12v power to terminals 86 and 85. Next, use a test light on terminals 87 and 30, to see if you have power. Finally, if the test light goes on the the problem lies somewhere else. Fuel Pump Circuit Breaker Reset