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Injectors not getting a ground - Cars & Trucks

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How do you know that ?
Need wiring diagram to find out
where the ground comes from
The vehicle computer will most likely be
the ground & not likely the problem,need
to check wiring with computer disconnected,
so as to not load the circuit & not burn out computer

Posted on Jul 09, 2013


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I have a 2003 s10 blazer 4.3v6 vortec. ok i keep getting hydrolock my #6 keeps feeling up with gas. i changed the sensors bought one new injector and new regulator and still the same.New pcm?

# 6 injector ground side is shorted to ground causing injector to fire constantly . It's probably not the PCM , If injector driver inside the PCM was bad the injector wouldn't fire at all . On the injector there are two wires , one is B+ voltage , the other goes to the PCM . PCM supply's a ground when triggered . How to test fuel injector circuit with basic tools open control wire

Jan 26, 2017 | 2003 Chevrolet Blazer

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What gives the injectors their pule?

with key on there should be battery voltage on one wire at the injector, the other wire is the ground and the ECM grounds the circuit. the cam sensor is the sensor that tells the ECM when to operate the injector to supply fuel to the cylinder. if you have both but no pulse from the injectors it could be the injectors are bad. if your missing the ground then it could be the injector drivers in the ECM.

Aug 12, 2015 | Cars & Trucks

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No injector pulse 4 cyl 93 f250 460

if you have a $5 test light, you could find the problem. just know that all eight injectors have a constant voltage applied to them anytime the key is in run or start. and also that 4 of the injectors share a common ground, they have their ground wires spliced together before the ground wire enters the pcm to be internally grounded. and the other four injectors are the same- their ground wires splice together. so your four that don't pulse have lost either the power to them, or the common ground wire for the 4 may have broken. or lost connection.

it is easier to check the power side first, so clip a test light lead to the negative battery post or cable, turn the key to on,and probe each injector connector. one of the terminals at all eight injectors will be the power wire, and it should light up the test light. if all eight injectors have power to them, you know it must be a ground side problem. if you find that 4 injectors have no power to them, look for a broken splice in the power wire to all injectors. back in those days, injectors were "bank fired". one side or bank of the engine all had the injector grounds spliced together, so all injectors on one bank fired (pulsed) simultaneously, and then the other bank was fired or pulsed. that was good until sequential injection matched the pulse to the cylinder ready to fire, more precise, and in the modern systems each injector ground has a separate ground inside the pcm. no more splicing of the ground wires, and having bank fired engines.

when the pcm grounds the circuit, the injector coil is energized and the injector opens to spray fuel out. so the injector has constant voltage to it. only when the circuit is grounded is that power applied across the injector.

Jan 22, 2015 | Cars & Trucks

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94 Opel kadett 1.6 single injector. Petrol does not seem to get thru for car to start.petrol pump is ok.where could the problem be.

Check the injector circuit. Here's how injectors usually work: when key is on, they have live power available to them. Key on, the circuit is turned on, so power passes through a fuse to the injector on the power wire. (Check the fuse- it's under the hood, most likely.)
To make the injector "pulse" or spray fuel out, the engine computer will internally ground the circuit for a split second. The injector has a power wire to it from that fuse. Then the ground wire at the injector goes into the computer.

If you have a test light, you can test the circuit. First, clip a test light ground lead to negative battery post. With key on, and the injector connector unplugged, check for battery voltage on the power wire. One of the wires should have voltage and will light up the test light. Now, move your test light lead to the battery POSITIVE post. Have a helper be cranking the engine over while you probe the ground wire-the one that did not light up the test light. If the injector circuit ground is good, the test light will now be blinking. (You are putting voltage into the ground wire to the computer, to check if it is properly grounding the circuit. Every time the light blinks, the computer has grounded the circuit.)
If the circuit passes both tests (key on, steady test light on power wire; engine cranking, blinking light on ground wire), then the injector circuit is good. The injector should be pulsing when it is connected and the engine is cranking. If no gas is coming out of the injector, could be that fuel is blocked somewhere (filter?) from reaching the injector, or it could be a shorted injector. Someone with a volt-ohm meter should check the resistance across the injector terminals and compare with manufacturers' specifications. This will determine if the injector is bad.

Sep 13, 2014 | Cars & Trucks

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1988 Chevrolet k1500 350 v8 not getting signal to fuel injectors

So, it's the injector circuit. There is a 10 amp injector fuse in the fuse block, on left side, 4th one down. Check this fuse. It supplies constant power to both injectors, on the red wire to injector 1, and a white wire splice from this to injector 2. A steady 12 volts anytime key is in on, run, or start. You can check this with a test light or voltmeter. Ground the test light and probe injector connector's red wire on injector 1, and the white wire on injector 2-both should be hot with key on.
This may be why the noid light didn't blink. The noid light must have this steady power signal, and when the computer internally grounds the injector ground circuit for a split second, you get injector pulse-or a blinking noid light.
You can check the ground circuit separately with a test light also for each injector. Place the ground clip of test light on the POSITIVE battery post, and probe the blue (ground) wire on injector 1, the engine must be cranking over, and the test light should be blinking. Do the same for the green wire on injector 2. If the test light is blinking on both ground wires, with engine cranking-the ground circuit is good. You are sending power down the ground wire to computer, and when the computer grounds the circuit, the tester will light up-it will blink because the computer only momentarily grounds the circuit to cause pulsing of the injectors.

Feb 18, 2014 | 1988 Chevrolet K1500

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Fuel injectors

I doubt it.
The injectors get power from a fused circuit when the key is on.
Then the engine computer grounds each injector when it wants the injector to open.
You would first need to know if the injectors have power, then if they are getting a ground signal from the computer when the engine is cranked.

Feb 06, 2014 | Hyundai Accent Cars & Trucks

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Just replaced the sending unit in my 1989 ford escort. getting fuel up to the injector but the injector isnt doing anything. whats the problem?

Check the injector circuit with a test light. Here's how: Turn key to on, not start. Ground the lead of a test light to a ground source, pull the electrical connector off an injector. There will be a power wire and a ground wire to each injector. With key on, power wire should have voltage. Probe the electrical harness to see if one of the injector terminals has power. Tester should light up. If nothing, check the injector fuse- under the hood or under the dash. The injector drive circuit (the hot side) should have power to the injector with key on. If not, check the drive circuit for a fault.

If the drive circuit works (the tester lit up on one terminal), then check the ground circuit. Move the test light clip to the positive post of the battery. Now probe the other terminal of the injector connector, the one that did not light the tester, and have someone crank the engine over. If ground circuit is working, the test light will now be blinking. If both tests are good, a steady light on the drive circuit, key on, and a blinking light on the ground circuit with engine cranking-then injector circuit is good.

Dec 03, 2013 | Ford Escort Cars & Trucks

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I have replaced the fuel pump on my 1991 chevy cheyenne im getting fuel to the injectors but they aint working

Check the injector fuse. With key on, injectors should have constant power available to them on one wire. The other injector wire is ground wire. With constant power to injectors, all it takes to pulse the injectors is for the computer to ground the injector ground inside the computer for a split second, and pulse occurs, causing fuel to spray out the injectors.
So if injectors aren't working, either the injector drive circuit (the power to injectors) or the injector ground circuit is lost. You can buy a cheap "noid light" at any auto parts store, and check the injector circuit. Just plug the light into the injector connector and crank the engine over. If the light is blinking, circuit is good. If no light, the circuit has a problem, either on the drive side or the ground side.
Here's a way to check the ground circuit separately. Use a test light clipped to the Positive battery post. Probe the ground wire terminal of the injector connector while the engine is cranked over. The test light should be blinking-meaning the computer is grounding the circuit normally and would be causing the injectors to pulse, if power is available to them.

Aug 19, 2013 | Cars & Trucks

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Why do i get a contant ground at the fuel injectors wire

Do you have this problem on all injectors, or just one?
The ground alone could not open the injector, you need a positive too

Mar 29, 2013 | 1998 Chevrolet Cavalier

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1996 cavaler not getting fuel throu injectors but pump is working fuel to injectors but injectors not palsesating what is the problame

Check for a fuse for the injectors in the power distribution box by the battery. Parts stores sell a cheap little tester called a "noid light" for testing injector circuits. They come in several sizes, so get the one that fits your injector connector. To use it, you pull off one injector connector and plug in the test light. If the circuit is good, the light will be blinking when the car is cranked over. If you get nothing, pull off all the injector connectors and test again. If you have one shorted injector, it may have shut down your injector drive circuit- that's why to pull off all connectors and re-test.
Here's a brief on how the injector circuit works: When key is on. the injectors will have constant battery voltage available to them on the power side (the injector drive circuit). When the engine is cranking or running, the engine computer will momentarily ground the ground circuit of injector (the ground wire goes straight into the computer for internal grounding), causing the injector to pulse. If you have no pulsing, determine if it is the drive circuit (no power to injectors), or the ground circuit that has failed.

Jul 09, 2012 | Cars & Trucks

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