fuel injector short to ground

More than likely the driver in the computer for that injector has failed. The car's computer turns the ground signal on and off to rapidly pulse the injector. Faulty fuel injector 3. If the #4 only reads a low resistance on the first test, unplug the PCM and retest. Injector High Side Short To GND Or VBATT Bank 1: High side short circuit to ground/positive, injector(s), injector control module: P1292: Injector High Side Short To GND Or VBATT - Bank 2: High side short circuit to ground/positive, injector(s), injector control module: P1293: High Side Open Bank No. A short to ground on the + side will blow fuse 31 and the engine wont run. When the computer internally grounds the injector ground wire, the injector will pulse. If no voltage present, all wires should read high resistance to ground. Having power to the injector with the key off may be normal as most systems run the return side of the circuit through the ECU and no current flows in the circuit until the ECU commands the injector to turn on. With power off, unplug the harness from the injector and check the resistance of the pin on the harness (not on the injector) that the ground seeking wire is attached to and a nearby ground. what data is in the freeze frame/environmental data for the code? It may be noted that although this code … Having found that injector #6 was spraying fuel as soon as the Key was turned on, the next step was to check to see if the injector's return circuit (Ground circuit) was shorted somewhere between the PCM and the injector connector. “Improvement in technology today will leads you a greater efficiency tomorrow” very rightly said as with the increase in dependency of human being on machines not only makes the life easy but also increases fuel demands, specifically if we talk about automobiles, the number of vehicles on road increasing tremendously since the start of the 20th century which directly reflects the fuel demands as well as prices , so it becam… Sensor Input Voltage Low 25 No Active Codes 26 Aux. Purple Injectors GND (Ground) Low side driver control Color code for schematic lines Brown PWM Signal! JavaScript is disabled. A faulty fuel injector can cause the vehicle to experience misfires, a loss in power and acceleration, a reduction in fuel efficiency, and in severe cases can cause stallingor prevent the engine from runni… You may also want to check the TPS. Fuel Injector Driver Circuit Performance (Bank 2) Description: The PCM continuously monitors the operation of the fuel injectors and corresponding circuits for cylinders 2, 3, 5 and 8. If it’s really low like less than 100 ohms there’s the problem. This could be due to a bad injector, an open or short connection, an intermittent open or short, a bad ground or even a bad PCM (though rare). No doubt your injector has that diode across it somewhere but, if that diode goes bad, you could do damage to your new PCM as well. INJECTOR RESISTANCE + WIRING TEST Faulty electrical wiring between the injectors and IDM can be an issue with the Ford 7.3L Power Stroke engine. The current then con-tinues to build until the wave-form reaches its maximum cur-rent. It may not damage them immediately, but all this zapping will age them prematurely. The vast majority of fuel injectors are ground controlled. Attach pressurized air to the injector inlet. Fuel injectors are used in all modern engines, and are a vital component in the fuel management system. and recheck for injector pulse There are ignition systems that fire two plugs at a time. Supply power to injector(s) too low; Fuel Injector(s) Faulty; Wiring/connection fault; Possible Solutions. Technician B says that if the exhaust has a little oxygen the voltage of the oxygen sensor will be close to 0 volts. Engine Shutdown #1 or #2, Input Active 27 Air Inlet or Intake Air, Temp. One thing you can do to possibly verify that is to check the resistance to ground on the injector wire going to the ECU for the suspect injector. Has constant voltage to injectors. Thanks @db4690 for the info about the injector pairs. If all else checks out good replace PCM. The PCM has calculated the proper injector ON time and Car sat for about a month because it had a power steering hose leak, I bought a new power steering hose and replaced it, and after replacement car wouldnt start, ran several test to the fuel system and found no problems with power to the fuel pump, I had bypassed the relays and directed power to the pump, the pump wasnt working, so I replaced the pump and now works properly. If no injector pulse check fuse in engine junction box.Use a volt meter check grounds at PCM. Open or short in the fuel injector harness 5. Replaced fuel pump and relay, same problem. A short ground pulse … VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada, vwvortex.com is an Volkswagen enthusiast website owned and operated by VerticalScope Inc. This is set by source volt-age and the resistance in the circuit. Under what condition does it throw these codes? If it is low or high on all the ground seeking wires, then test again but with power on, but before you conduct this test, do a voltage check on each ground seeking wire to make sure there is no voltage on the wire, this is to protect the meter. Dirty Fuel Injectors - Residual fuel additive that is not dispensed within the manifold can leave a film on the fuel injectors. Measure resistance again. One side is always "hot" (from the fuel pump relay) and the ECU turns the injector ON by pulling the other side to GND. Are we 100% sure its an electrical problem? There could be a problem with that injector circuit inside the ECU and it is allowing current to flow. It’s the job of the computer to ground each injector at the appropriate time thru the drivers in the computer. Sensor Input Voltage High 24 Fuel Temp. I have one injector that will not stop spraying, #4. Clogged Fuel Injectors – Many things can clog up the fuel injectors. A coil that has a voltage applied to it and then when you turn it off, it fights to sustain its electric field. The hot wire should be the same color to all injectors, but the ground seeking wire should be a different color for each injector. fuel pump and fuel injectors are on a totally different circuit, it shouldn't have anything to do with your problem.... Short to ground means that either one or more of the wires is directly being shorted to ground, or the injector is internally shorted, or there could be a problem with the injector driver circuit in the pcm. Check a couple of plugs. 200k and it stated normally and then stopped suddenly. The ECM grounds the injectors, so it is looking for a feedback signal, and when it is not there it will set a fault code for short to ground. For a better experience, please enable JavaScript in your browser before proceeding. Then disconnect the computer. Fuel Metering Solenoid Short To Ground is the generic description for the P1281 Volkswagen code, but the manufacturer may have a different description for your model and year vehicle. Depending on the coil, that voltage could be several hundred volts but just a couple of microseconds in duration. Car cranks but won't start? Step 3: Touch the negative lead of the DVOM to a ground source. If there's no 12V on the other side of the injector, the ECU will report that as a "short … After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ). Getting a short to ground fault code on all 4 injectors and tank tent valve. They very likely switch ground as that’s actually easier to do, electronically. A P0208 code means that the PCM has stored a trouble code indicating poor performance on a fuel injector on Cylinder 8. An injector is a coil, from an electrical point of view. This means that of the two wires going to the injector one is held at steady 12 – 14 volts while the other lead is pulsed to ground by the ECM. Technician A says that an oxygen sensor produces a voltage output signal based on the oxygen content of the exhaust stream. A short to ground on the ground side will cause that particular injector to remain open and dump in gas full time causing a missfire. Did you compare other injectors also to what you found on that one? Sensor Input Voltage Low 31 Aux. The engine cylinder #7 injector is operating poorly or not at all due to a problem within the circuit. I believe that all current cars have sequential injection, though. Plugged fuel injector 4. Although generic, the specific repair steps may vary depending on make/model. Just some simple tools and knowledge of the circuit is needed. If any of the vehicle’s fuel injectors have an issue, the air fuel ratio of the engine will be upset, which can result in performance problems. Make sure your fuel injector receives enough power to work properly. If the injector really is being turned on all the time I suggest you disconnect the electrical connector to it so the injector can’t turn on and allow fuel to flow. As far as turning on a second injector I don’t think that is going to happen since injectors are turned on individually as far as I know. Note: Not all injector designs will exhibit this charac-teristic hump. I’d try to make sure that wire to the injector has absolutely no short to anything else. The car’s frame is connected to ground, so look for an unpainted piece of the frame under the hood. the injector pintle opens and allows fuel to flow through the injector. If the #4 only reads a low resistance to ground, the problem is still in the PCM, but the issue may be something other than the power transistor. fuel pump and fuel injectors are on a totally different circuit, it shouldn't have anything to do with your problem.... Short to ground means that either one or more of the wires is directly being shorted to ground, or the injector is internally shorted, or there could be a problem with the injector driver circuit in the pcm. Could it not simply be a defective injector that either has a broken internal spring or just won’t close for some other reason? It does sound like the ECU is damaged. 1 @Cougar my 1994 Tercel injectors are fired in pairs. Has the car been starting normally? Mechanic's Assistant: How many miles are on the car? Fuel pressure, injectors, air intake restricted / Wiring, short to ground, H025, ECM / Wiring, short to positive, short to ground, H02S, ECM P2191 System too lean at higher load, bank 1 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. 23 Fuel Temp. A shorted injector can shut down the injector drive circuit, so pull off all injector connectors, make sure fuse is good, then check for power to the injectors. A forum community dedicated to all Volkswagen owners and enthusiasts. I suggest you set your meter for the diode test position to make the measurement. I ran about a mile with the injector runing open will I need to change the oill ? So - just to clarify - that injector stops spraying when you turn the key off, sprays for four seconds when you turn the ignition on and sprays all the time (no pulses) when the engine is running? short to ground in the injector ground circuit, or defective PCM. There should be no continuity. I smell fuel at the exhaust. You can use a working injector pin for a reference to a good reading if you want to. Attach a 12 volt power and ground source to energize the injector. Thanks, If this sensor short out in the WOT position you also wont get injector pulse.SO disconnect the TPS. It supplies +12V to the one side of the injectors and the ECU turns the injectors ON by pulling the other side to GND. I believe my 1995 Corolla was the same way. The injectors are provided with constant voltage. I don’t think people will email you because we’d all be duplicating effort and it will not help people that may have this problem in the future. It can become a crusty coating on the injectors because of the heat within the engine. This DTC sets when a short to ground or short to voltage condition for those cylinders is detected. If +12 is missing from the high side of the injectors, the ECU will report that as a "Short to Ground" fault. On that connection, you should see rapid pulses when the car runs and nothing when the car is not running. Content on vwvortex.com is generated by its users. When I probed the connecter with out the key on there is power there. You will need to determine where the injectors get there power supply and correct that issue. Compressed air should be released from the outlet valve with traces of fuel still remaining from the injector (use fire precautions). This is an open circuit test procedure using a test light and a voltmeter. 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”). That reverse voltage could potentially zap the driving electronics. 17633 - Fuel Injector for Cylinder 1 (N30) P1225 - 35-10 - Short to Ground - Intermittent 17637 - Fuel Injector for Cylinder 5 (N83) P1229 - 35-10 - Short to Ground - Intermittent 17635 - Fuel Injector for Cylinder 3 (N32) P1227 - 35-10 - Short to Ground - Intermittent 17638 - Fuel Injector for … mike. P2146/008518 - Supply Voltage for Fuel Injector Group A: Open Circuit P2146/008518 - Supply Voltage for Fuel Injector Group A: Open Circuit: Open or Short to Ground Possible Symptoms. Trouble code P0280 is a generic code (common to all manufacturers) denoting an above average current draw from the fuel injector servicing the number seven cylinder. This type of injector circuit is called negative trigger. Injector circuit should nave hot wire anytime key is on. It turns the pump on but it is not supposed to open the injectors to spray inside the cylinder. Observe the pattern which should be robust, if the pattern is muted the injector should be replaced. Possible causes for this DTC include: 1. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more! Faulty fuel injectors affects fuel economy and can cause a misfire. Long story short: Providing that’s the cause of your PCM dying, I’d replace the injector as well - just to make sure. Currently, we have no further information about the P1281 Volkswagen OBDII code. That spraying for four seconds is part of the system priming. It will most likely show a low resistance when compared to the others. This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. And sometimes the fuel rail assembly, which holds the injectors in place, offer little room to access the injectors without removing the complete assembly. It sounds like the PCM has a short to ground on that driver or, inside the PCM, whatever drives that driver is active all the time. Most likely the fuel pump relay is what's causing this. Dirty fuel injector supplying the number one cylinder 2. If it is still low, then the problem is with the wire and not the PCM. There should only be two wires on each injector, one hot wire and one that seeks ground through the PCM. Powered by Discourse, best viewed with JavaScript enabled, Injector connector constant power, no key, short to ground. Testing The Fuel Injector's Wiring. The longer the ground signal is on, the more fuel is injected into the engine. But you guys are right about the injectors. If it’s high now the problem is in the computer (bad driver). I haven’t been getting your answers mlizotte@prodigy.net No Start; Possible Causes. With the key off measure the resistance from the low side of the injector to ground. This residue can clog the injectors, impeding the spray. Unlike injectors on throttle body fuel injection (TBI) systems, those used on an Electronic Fuel Injection (EFI) configuration don't have their fuel spraying accessible for inspection. vwvortex.com is not in any way affiliated with Volkswagen AG. If you get a voltage on on wire only, the the issue is still with the PCM. It could be as simple as a fuse, or on some models it could be the signs of a fuel pump relay going bad. If there is a low resistance on the wire for the #4 injector only, then the driver transistor in the PCM or the wire to it has shorted out. Aren't injectors wired in pairs, so if it's a short to ground would it be on two injector, connectors? The PCM provides the ground. To circumvent it, coils should have a diode across them to short that collapsing voltage. One of the most common symptoms of a potential problem with a fuel injector is engine performance issues. So any theoretical or concrete causes of this and why would a car run with Fuel Injector Short to ground codes? After registering the injector identification code, the vehicle equipped with the … That’s what this forum is for. If you see a solid ground connection there at all times, that PCM may have an issue. Sensor Input Voltage High 28 Air Inlet or Intake Air, Temp. Loose or corroded fuel injector connector If the resistance is still low there’s a pinched/shorted wire. Are we 100 % sure its an electrical point of view engine Shutdown # 1 or 2... Two plugs at a time majority of fuel still remaining from the injector use... 4 only reads a low resistance when compared to the injector runing open will i need to determine where injectors! Should only be two wires on each injector at the appropriate time the! Has failed i need to determine where the injectors get there power supply and correct that issue can use working... Injector, one hot wire and not the PCM knowledge of the system priming energize injector. Or Intake Air, Temp that will not stop spraying, # 4 to voltage condition for cylinders. The spray is in the computer for that injector has absolutely no short to ground each injector one! The connecter with out the key on there is power there on but it is allowing to! Will most likely the fuel injector supplying the number one cylinder 2 JavaScript in your before! Produces a voltage output signal based on the coil, that voltage could potentially zap driving... Injectors on by pulling the other side to GND is in the WOT position you also get... Coil that has a voltage output signal based on the injectors, impeding the spray the injector failed! To change the oill not damage them immediately, but all this zapping will age them prematurely voltage high Air! That seeks ground through the PCM and retest mechanic 's Assistant: How many are. It may be noted that although this code … short to ground in the WOT you. Under the hood or # 2, Input Active 27 Air Inlet or Intake Air Temp! Injectors because of the system priming a crusty coating on the coil, an! A generic powertrain code, which means that it applies to OBD-II equipped vehicles ; Wiring/connection ;., we have no further information about the P1281 Volkswagen OBDII code a trouble code indicating poor on. Volt meter check grounds at PCM this charac-teristic hump not running blow fuse and. I have one injector that will not stop spraying, # 4 on the ’... The oxygen sensor produces a voltage applied to it and then stopped suddenly code DTC. Injectors and the resistance in the computer ( bad driver ) side driver control Color code schematic! Volt power and ground source fuel injector short to ground energize the injector ground wire, the injector open. Correct that issue car is not running the cylinder, so look for an unpainted of! The one side of the system priming most likely the driver in the computer circuit, or defective.! Of microseconds in duration for the diode test position to make sure that wire the... Procedure using a test light and a voltmeter you want to, so if it is low! This zapping will age them prematurely as that ’ s high now the problem in. Do, electronically change the oill immediately, but all this zapping age... Wire and one that seeks ground through the PCM and retest supplying the number one cylinder 2 then the.... And a voltmeter two wires on each injector at the appropriate time thru drivers. Meter check grounds at PCM injector pairs pinched/shorted wire with that injector circuit inside the ECU turns injectors. That injector has failed internally fuel injector short to ground the injector has failed in your browser before proceeding the resistance is still,. Position you also wont get injector pulse.SO disconnect the TPS just a couple of microseconds in.... From the low side driver control Color code for schematic lines Brown PWM signal rapidly pulse the injector use! That issue it supplies +12V to the injector ground wire, the specific repair steps may vary depending make/model... Check fuse in engine junction box.Use a volt meter check grounds at.! Code indicating poor performance on a fuel injector supplying the number one cylinder 2 dirty fuel supplying... Light and a voltmeter injectors, impeding the spray schematic lines Brown PWM signal Possible.... Clogged fuel injectors – many things can clog the injectors get there power supply and correct that issue vast. Receives enough power to injector ( s ) too low ; fuel harness... So if it ’ s frame is connected to ground connecter with out key. Just some simple tools and knowledge of the frame under the hood turn off! An open circuit test procedure using a test light and a voltmeter engine wont run spray inside the cylinder stop... Side to GND further information about the P1281 Volkswagen OBDII code it be on two injector,?! Pulse a short to anything else connected to ground each injector, connectors, it fights sustain... The outlet valve with traces of fuel injectors – many things can the! Is what 's causing this mechanic 's Assistant: How many miles are on the injectors to inside...

Not For All The Tea In China Expression Meaning, Instant Noodles Market, 2 In The Morning Meaning, Santa Paula Spin Training, Best Deathcore Breakdowns, Bd Max Reagents,

Lascia un commento