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How do you know it stay's on ? Injector balance test ? Current draw test ? check it with a volt meter , what ? There are injector testing videos on youtube. ! Have you checked for a short to ground on the wire that goes from injector to the PCM ? One side of the injector wiring connector should have B+ voltage , disconnected from the injector . The other wire goes to the PCM , which will supply a ground when commanded ! For the injector to stay on all the time , that wire would need to be touching ground somewhere !
Don't know of a Liberty, so I looked at a '90 Legacy. The injector power wire comes from a fused source, and it is spliced, probably in the injector harness, to go to all injectors.
When it is acting up-no power to one injector-you need to ohm that injector power wire. Unplug the injector harness connector, then unplug that injector connector, and put an ohmmeter from the harness connector to the injector connector. See what resistance to current is in that wire: if anything other than a very low ohm value, there is a break or bad connection at the splice. It can be repaired or the injector harness can be replaced. Post back if you need further help or don't understand.
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.
Hi try checking the fuses and relay.if that's all ok then have the car put on a diagnostic scanner it should pick up a fault.it could also be a faulty immobilisor check if power is going to other sensors in the engine bay then immob. should be ok.
Maybe the injector is shorted out. At any rate it sounds like it is stuck open. You can do an ohm test of the injector, check it's resistance, but I don't know the value you need to look for on this. Just to give you a range to look for, a Chrysler injector's resistance should be 12-15 ohms. Yours should show low resistance as well. If it's open (no value at all) or if the resistance is very high (high ohms reading), it is bad.
In reference to the last statement in your post, no signal will keep it from flooding. An injector is a solenoid and normally closed. The only way to open them is to complete the circuit across their terminals. As long as the key is on, the injector will have a steady 12 volt current available to the injector on the power side. To pulse them or cause them to open, the ecu will ground the circuit for a split second, energizing the solenoid, and causing it to raise the pintle on the injector for fuel to spray out. The ecu will just keep on its merry way, pulsing the injector over and over, never realising the engine is flooded. If it's flooding with the injector connector disconnected, the injector must be stuck open. Hope this helps you solve it. Good luck.
I had to give it gas sometimes for it to start ? Stepping on the gas pedal does not give it gas till it starts . Pushing on the accelerator pedal while cranking gives it more air , not fuel , untill it starts an is running . It has electronic fuel injection . Your vehicle is flooding out . running rich .
DTC P0200 Injector Control Circuit
The powertrain control module (PCM) has four fuel injector driver circuits, each of which controls a fuel injector. The PCM monitors the current in each driver circuit and is able to control the driver circuit. The current through each driver can rise to a peak of 2 amps to quickly open the fuel injectors and can reduce to 1/2 amp to hold the fuel injectors open. This is called peak and hold. If the current cannot reach a 2 amp peak, a DTC is set. This DTC is also set if an fuel injector driver is shorted to voltage.
An injector driver circuit that is open or shorted to voltage will cause a DTC P0200 to set and will also cause a misfire due to an inoperative injector. The misfire DTC should also be set indicating a misfire.
Long Term and Short Term FT that are excessively high or low are a good indication that an injector is malfunctioning. Refer to Sequential Multiport Fuel Injector Balance Test to test for malfunctioning injectors.
Replace fuel filter and fuel sock. Even if fuel pump runs does not mean it is building pressure, needs to build 30 to 50 PSI, if it will not hold pressure for 30 seconds the pump is still bad. The pump supplies the pressure for the injectors and the injectors are operated by electrical impulse when injector opens if the fuel pressure is not high enough it will not push fuel threw the pintal of the injector.