Question about 1999 Dodge Ram

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My injectors and my coil have no power i have traced the wires as far as i can and nothin no fire i have ground but no fire can anyone send me a diagram of it or help me some how thanks

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If your injectors aren't firing and the relay is good, then the computer is bad.

Posted on Sep 25, 2009

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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

1 Answer

I have power to the coil and to the injectors, but no spark to plugs.


No year, make or model. The ECM controls the spark by grounding the coil/s. It uses the crank sensor to determine the spark to cylinder needing fire. No fire would point me to the crank sensor and wiring to it.

Nov 30, 2014 | Cars & Trucks

1 Answer

No firing on coil #1&2 of the 2az fe engine.


check for power and ground at the coil. if you have no power then you will have to trace the wire back to find the break. if you have no ground then check for a bad wire between the coil and the computer. if this is good then you have a bad coil driver in the computer. if you have good power and ground then the coil is bad.

Aug 12, 2014 | Cars & Trucks

1 Answer

I have 89rs cavalier,the injector quit spraying. Tryed replacing computer,crank sensor,did not fix problem. I jump the injector and it sprays. Can anyone help me with this problem? I love my car and don't...


Check the ECM 15 amp fuse, position or fuse #3 in the fuse block. This fuse supplies power both to the injector and to the ignition coil. The red wire to the injector is the power wire, and it should be hot in run or on. If no power on the red wire with key on, check that the coil has power to it on the pink and black wire. If the coil has power, but none to the injector, the red wire is open between fuse #3 and the injector.

If the red wire has power, but the injector doesn't pulse, check the blue ground wire from injector to the ECM. The ground wire may be broken. When the computer internally grounds the injector circuit for a split second, that is what causes the pulse. The injector has constant voltage to it on the red wire when the key is on.

To check the ground wire for continuity, use a voltmeter set to ohms, one lead on the blue wire terminal at the injector, and the other lead on the blue wire pin at the ECM connector that has that blue wire. Take the connector off at the ecm. (take the negative battery terminal off first.) You may have to use a jumper wire from the injector terminal towards the passenger side, so the ohmmeter leads can reach between the ecm connector under the glove box, and to the injector. If the ohmmeter shows low ohms-low resistance to current flow-then the wire is good and not broken.

May 20, 2014 | Cars & Trucks

3 Answers

What could be the causes of injectors not opening and spark plugs not firing


A long list of things. From fuses to ignition switch to ecu to security alarm and more.

Here is how to start looking: Turn the key to on. Do the dash gauges and warning lights and check engine light come on? Then power is getting to the switch and being sent out from it. Next, use a test light and check for power TO the coils and TO the injectors with key on. All four injectors use the same color power wire. My wiring diagram is poor quality, but it looks like a green wire or possibly a gray wire-remember same color power wire to all injectors-the other injector wire is a ground wire, and they are all different colors. Pull one injector connector off and check for power on one terminal with key on. And could do the same at the coil pack. With key on, the white wire with red stripe to the coils should have power-actually, the white wire is spliced and two white wires are shown going to coil pack-this is the primary current to the coils- is hot in run or start.

If no power to coil or injectors, here are the fuses to check: in the under hood fuse/relay block: ecu-10 amp fuse, Eng-15 amp fuse, and these maxi fuses: fuel inj-30 amp fuse, Main- 80 amp fuse, Ign-40 amp fuse. And one more- a designated Main fuse-15 amp fuse.
If these fuses are good, should have power going to injectors and the coil pack with key on. If the key is turning on the dash, some of those fuses are known good, but need to check all of those listed.

I will stop here, and wait for your reply. You get this far, you are on the way to diagnosing the problem.

May 07, 2014 | 2000 Kia Sportage

1 Answer

90 ranger has fire on possenger side but none on driver.. will startand run with a shot of eager Has new coil packs,starter n sylinod, ignition mod, switch, and cylinder.plus computer


Check your injector wiring on the non-firing side. Each injector has a hot wire and a ground wire to it. Check for a power signal with key on, and check the ground wire from injector to computer for continuity. You could use a test light clipped to the positive battery post, with the probe in the ground side of injector connector. Now crank the engine over and the test light should be flashing, if the ground wiring is correct.

Apr 09, 2013 | Cars & Trucks

1 Answer

93 vortec V6 4.3L No start. New CPI, New ECM,New Distributor,New Coil,


Right at the coil is the ICM (ignition control module) These wire are known for poor male to female connection have some one crank it and you wiggle it to make contact,Also where the battery is is a power ground if that ground is corroded it will give code P1355.

Mar 29, 2012 | 1993 Chevrolet S-10 Blazer

1 Answer

My 1986 300zx non turbo injectors on pas side not working have power both wires and can ground signal wire and they will fire not getting ground signal could this be computer related


That wire from injector to ecm is the grounding side of the circuit. The computer grounds the circuit inside when it is time for the injector to open. Not sure but I think all three wires on pass. side splice into a single wire going to the ecm. Check the continuity of the wires from pass, side to ecm. Any corrosion on the ecm pins?
Am I understanding right that you have power to both banks of injectors, but only one side, or bank, is firing? If it's not a wiring problem, it could be the computer.

Nov 10, 2011 | 1986 Nissan 300ZX

3 Answers

Hi I have an 87 s10 blazer 2.8L 4x4 and does not want to spray fuel into the throttle positioning sensor but fuel goes to and from it, I've checked the fuses replaced the fuel pump, it will fire with ether...


One side of the injector plug at each of the two injectors has 12 volts key on engine off.
The other side is grounded by the PCM computer to fire the injectors.
Put a test light across one of the injector plugs while cranking, Watch for flashing.

Jan 27, 2011 | 1987 Chevrolet Blazer

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