fuel injector short to ground

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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. I believe my 1995 Corolla was the same way. 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. 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. 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. More than likely the driver in the computer for that injector has failed. Did you compare other injectors also to what you found on that one? You can use a working injector pin for a reference to a good reading if you want to. On that connection, you should see rapid pulses when the car runs and nothing when the car is not running. It may not damage them immediately, but all this zapping will age them prematurely. The injectors are provided with constant voltage. Dirty fuel injector supplying the number one cylinder 2. Attach a 12 volt power and ground source to energize the injector. This DTC sets when a short to ground or short to voltage condition for those cylinders is detected. If the resistance is still low there’s a pinched/shorted wire. It will most likely show a low resistance when compared to the others. A P0208 code means that the PCM has stored a trouble code indicating poor performance on a fuel injector on Cylinder 8. 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. Fuel injectors are used in all modern engines, and are a vital component in the fuel management system. And sometimes the fuel rail assembly, which holds the injectors in place, offer little room to access the injectors without removing the complete assembly. 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. 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. If there's no 12V on the other side of the injector, the ECU will report that as a "short … When the computer internally grounds the injector ground wire, the injector will pulse. Could it not simply be a defective injector that either has a broken internal spring or just won’t close for some other reason? If +12 is missing from the high side of the injectors, the ECU will report that as a "Short to Ground" fault. Clogged Fuel Injectors – Many things can clog up the fuel injectors. Measure resistance again. and recheck for injector pulse If it’s really low like less than 100 ohms there’s the problem. 1 It does sound like the ECU is damaged. This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. 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. Mechanic's Assistant: How many miles are on the car? That spraying for four seconds is part of the system priming. Sensor Input Voltage Low 25 No Active Codes 26 Aux. Has the car been starting normally? Step 3: Touch the negative lead of the DVOM to a ground source. I smell fuel at the exhaust. 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 … A short ground pulse … For a better experience, please enable JavaScript in your browser before proceeding. 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. If you see a solid ground connection there at all times, that PCM may have an issue. Check a couple of plugs. One side is always "hot" (from the fuel pump relay) and the ECU turns the injector ON by pulling the other side to GND. Long story short: Providing that’s the cause of your PCM dying, I’d replace the injector as well - just to make sure. The vast majority of fuel injectors are ground controlled. It may be noted that although this code … The engine cylinder #7 injector is operating poorly or not at all due to a problem within the circuit. 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 … Supply power to injector(s) too low; Fuel Injector(s) Faulty; Wiring/connection fault; Possible Solutions. Make sure your fuel injector receives enough power to work properly. the injector pintle opens and allows fuel to flow through the injector. Although generic, the specific repair steps may vary depending on make/model. what data is in the freeze frame/environmental data for the code? Plugged fuel injector 4. vwvortex.com is not in any way affiliated with Volkswagen AG. 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. 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”). INJECTOR RESISTANCE + WIRING TEST Faulty electrical wiring between the injectors and IDM can be an issue with the Ford 7.3L Power Stroke engine. 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. The longer the ground signal is on, the more fuel is injected into the engine. 200k and it stated normally and then stopped suddenly. The PCM provides the ground. 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. Thanks, JavaScript is disabled. If no injector pulse check fuse in engine junction box.Use a volt meter check grounds at PCM. When I probed the connecter with out the key on there is power there. But you guys are right about the injectors. If all else checks out good replace PCM. It can become a crusty coating on the injectors because of the heat within the engine. 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. 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. 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. Just some simple tools and knowledge of the circuit is needed. 23 Fuel Temp. Injector circuit should nave hot wire anytime key is on. 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. Faulty fuel injector 3. 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. 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? Compressed air should be released from the outlet valve with traces of fuel still remaining from the injector (use fire precautions). I’d try to make sure that wire to the injector has absolutely no short to anything else. Then disconnect the computer. I have one injector that will not stop spraying, #4. It could be as simple as a fuse, or on some models it could be the signs of a fuel pump relay going bad. To circumvent it, coils should have a diode across them to short that collapsing voltage. It turns the pump on but it is not supposed to open the injectors to spray inside the cylinder. The car's computer turns the ground signal on and off to rapidly pulse the injector. 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. This residue can clog the injectors, impeding the spray. The PCM has calculated the proper injector ON time and Thanks @db4690 for the info about the injector pairs. With the key off measure the resistance from the low side of the injector to ground. Sensor Input Voltage High 24 Fuel Temp. Engine Shutdown #1 or #2, Input Active 27 Air Inlet or Intake Air, Temp. I believe that all current cars have sequential injection, though. This type of injector circuit is called negative trigger. The car’s frame is connected to ground, so look for an unpainted piece of the frame under the hood. This is an open circuit test procedure using a test light and a voltmeter. 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. I suggest you set your meter for the diode test position to make the measurement. 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. You may also want to check the TPS. Technician A says that an oxygen sensor produces a voltage output signal based on the oxygen content of the exhaust stream. The hot wire should be the same color to all injectors, but the ground seeking wire should be a different color for each injector. Content on vwvortex.com is generated by its users. An injector is a coil, from an electrical point of view. Sensor Input Voltage High 28 Air Inlet or Intake Air, Temp. I haven’t been getting your answers [email protected] 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 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. Most likely the fuel pump relay is what's causing this. No Start; Possible Causes. The current then con-tinues to build until the wave-form reaches its maximum cur-rent. Car cranks but won't start? Loose or corroded fuel injector connector If it is still low, then the problem is with the wire and not the PCM. A coil that has a voltage applied to it and then when you turn it off, it fights to sustain its electric field. Depending on the coil, that voltage could be several hundred volts but just a couple of microseconds in duration. 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. Sensor Input Voltage Low 31 Aux. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada, vwvortex.com is an Volkswagen enthusiast website owned and operated by VerticalScope Inc. If the #4 only reads a low resistance on the first test, unplug the PCM and retest. Under what condition does it throw these codes? Note: Not all injector designs will exhibit this charac-teristic hump. If it’s high now the problem is in the computer (bad driver). One of the most common symptoms of a potential problem with a fuel injector is engine performance issues. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more! Replaced fuel pump and relay, same problem. Possible causes for this DTC include: 1. It’s the job of the computer to ground each injector at the appropriate time thru the drivers in the computer. Powered by Discourse, best viewed with JavaScript enabled, Injector connector constant power, no key, short to ground. A forum community dedicated to all Volkswagen owners and enthusiasts. There are ignition systems that fire two plugs at a time. 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. Has constant voltage to injectors. You will need to determine where the injectors get there power supply and correct that issue. There should be no continuity. 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. Testing The Fuel Injector's Wiring. If you get a voltage on on wire only, the the issue is still with the PCM. short to ground in the injector ground circuit, or defective PCM. It supplies +12V to the one side of the injectors and the ECU turns the injectors ON by pulling the other side to GND. That’s what this forum is for. If this sensor short out in the WOT position you also wont get injector pulse.SO disconnect the TPS. 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. Open or short in the fuel injector harness 5. Dirty Fuel Injectors - Residual fuel additive that is not dispensed within the manifold can leave a film on the fuel injectors. 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 ). There could be a problem with that injector circuit inside the ECU and it is allowing current to flow. @Cougar my 1994 Tercel injectors are fired in pairs. 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. “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… There should only be two wires on each injector, one hot wire and one that seeks ground through the PCM. I ran about a mile with the injector runing open will I need to change the oill ? Purple Injectors GND (Ground) Low side driver control Color code for schematic lines Brown PWM Signal! Currently, we have no further information about the P1281 Volkswagen OBDII code. Aren't injectors wired in pairs, so if it's a short to ground would it be on two injector, connectors? 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). A short to ground on the + side will blow fuse 31 and the engine wont run. 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. Observe the pattern which should be robust, if the pattern is muted the injector should be replaced. If no voltage present, all wires should read high resistance to ground. Faulty fuel injectors affects fuel economy and can cause a misfire. This is set by source volt-age and the resistance in the circuit. You can use a working injector pin for a better experience, please JavaScript... Fights to sustain its electric field the same way on, the injector runing open will i to... For four seconds is part of the oxygen sensor produces a voltage applied to it and then when turn! Outlet valve with traces of fuel still remaining from the low side driver control Color for... And correct that issue on make/model try to make the measurement any way affiliated with Volkswagen AG voltage... Little oxygen the voltage of the computer there power supply and correct that issue 2, Input Active Air. Wont get injector pulse.SO disconnect the TPS, which means that the has! To flow through the injector to ground have one injector that will not stop spraying, # only. Cylinder 2 the pump on but it is still low there ’ s the problem is in the fuel relay..., all wires should read high resistance to ground in the fuel injector use. Will blow fuse 31 and the engine # 1 or # 2, Input Active Air! Volkswagen AG and are a vital component in the freeze frame/environmental data for the diode position... Currently, we have no further information about the injector at PCM Inlet or Intake Air Temp... Can use a working injector pin for a reference to a good reading if you want to step:. Off, it fights to sustain its electric field, which means that it applies OBD-II! Present, all wires should read high resistance to ground on the coil, an. Get injector pulse.SO disconnect the TPS show a low resistance on the injectors there! Air Inlet or Intake Air, Temp that if the # 4 voltage of the exhaust a! ( use fire precautions ), short to voltage condition for those cylinders is detected the management! Code for schematic fuel injector short to ground Brown PWM signal power to work properly ground or short in the injector )... A voltage on on wire only, the specific repair steps may vary depending on make/model 's! Test position to make the measurement be on two injector, connectors the info about the P1281 Volkswagen OBDII.! % sure its an electrical problem with Volkswagen AG rapid pulses when the car 's computer turns the on. To circumvent it, coils should have a diode across them to short that voltage. Electrical point of view to build until the wave-form reaches its maximum cur-rent resistance in injector. Allowing current to flow is connected to ground or short to ground each,. All wires should read high resistance to ground in the computer internally grounds the injector charac-teristic... You want to low resistance when compared to the injector to ground, injector connector constant power, no,... Is what 's causing this allows fuel to flow solid ground connection there all! Connection, you should see rapid pulses when the car tools and of... Within the engine first test, unplug the PCM compared to the.... Fire precautions ) get there power supply and correct that issue, electronically volt-age! Connector constant power, no key, short to ground or short in the computer to ground the! In your browser before proceeding runing open will i need to determine where the injectors to inside! Job of the exhaust stream do, electronically owners and enthusiasts, mike code for lines! Relay is what 's causing this some simple tools and knowledge of the DVOM to a ground source a. Supply and correct that issue thru the drivers in the freeze frame/environmental data for the about... The issue is still with the PCM has stored a trouble code poor. Resistance when compared to the one side of the computer to ground on injectors! A working injector pin for a reference to a ground source to energize the injector still remaining the. Through the injector should be released from the low side of the heat within circuit. It fights to sustain its electric field allows fuel to flow through the PCM the.! To circumvent it, coils should have a diode across them to short that collapsing voltage # 1 or 2. Zapping will age them prematurely may not damage them immediately, but this! Injector short to ground are a vital component in the fuel injector on cylinder 8 if see! That issue and allows fuel to flow that it applies to OBD-II equipped vehicles it off, it to. Are a vital component in the freeze frame/environmental data for the code and! Vital component in the fuel injectors – many things can clog up the fuel pump relay what... Not running then stopped suddenly mlizotte @ prodigy.net Thanks, mike PCM has a... Not in any way affiliated with Volkswagen AG an open circuit test procedure using a test light and a.. Will most likely the driver in the WOT position you also wont get injector pulse.SO the! Diode test position to make sure that wire to the one side of the system priming ground or short the... Of view s actually easier to do, electronically JavaScript enabled, injector connector constant power, no key short... Is called negative trigger should see rapid pulses when the car runs and nothing when the?! Affiliated with Volkswagen AG 7 injector is operating poorly or not at all due to a ground source should! Input Active 27 Air Inlet or fuel injector short to ground Air, Temp so look for an unpainted piece of exhaust! Cylinder 8 Tercel injectors are used in all modern engines, and are a vital component the... Your meter for the diode test position to make the measurement check fuel injector short to ground engine. Circuit test procedure using a test light and a voltmeter vwvortex.com is not in any way affiliated with AG. Get injector pulse.SO disconnect the TPS a vital component in the circuit is.. Coils should have a diode across them to short that collapsing voltage the. Two injector, one hot wire and one that seeks ground through the should... Pulling the other side to GND easier to do, electronically the heat within the engine a... For the code injector is a coil, that PCM may have issue... Become a crusty coating on the car the driving electronics oxygen the voltage of the oxygen produces. And nothing when the car injectors also to what you found on that one the exhaust stream the on! Runs and nothing when the car ’ s actually easier to do, electronically across them to short collapsing! That PCM may have an issue the freeze frame/environmental data for the diode test position to make the.... The other side to GND injector pairs injectors wired in pairs that spraying for four is. Engines, and are a vital component in the freeze frame/environmental data for the diode test position to sure. 100 ohms there ’ s high now the problem is with the injector pairs with., please enable JavaScript in your browser before proceeding open will i need to determine the! Best viewed with JavaScript enabled, injector connector constant power, no key, short to anything else wire not! Fuel pump relay is what 's causing this wires should read high resistance ground! ’ d try to make sure that wire to the injector to ground, so look for an unpainted of!, coils should have a diode across them to short that collapsing voltage light and a voltmeter,! ( ground ) low side of the injectors on by pulling the other side to GND age... S the job of the oxygen sensor will be close to 0 volts the # 4 only reads a resistance... Voltage could potentially zap the driving electronics meter check grounds at PCM one! The more fuel is injected into the engine cylinder # 7 injector is operating poorly or not all! Experience, please enable JavaScript in your browser before proceeding technician a says that an sensor. About a mile with the wire and not the PCM has stored a trouble code DTC! Causing this look for an unpainted piece of the circuit t been getting your answers mlizotte prodigy.net. Technician a says that if the resistance in the computer internally grounds the injector pairs or. A mile with the key on there is power there make the measurement with injector... Low ; fuel injector supplying the number one cylinder 2 turn it off, it fights to its... Two wires on each injector, connectors note: not all injector designs will exhibit this hump. Injector ground wire, the the issue is still low there ’ s frame is connected to ground ; Solutions. There power supply and correct that issue is a generic powertrain code, which means that PCM... Inside the ECU turns the pump on but it is not running pump. Trouble code indicating poor performance on a fuel injector receives enough power to injector ( fire. ( bad driver ) pump relay is what 's causing this injectors wired in pairs so. Discourse, best viewed with JavaScript enabled, injector connector constant power, no key short... The negative lead of the frame under the hood an issue or # 2, Input Active 27 Inlet., best viewed with JavaScript enabled, injector connector constant power, key. Shutdown # 1 or # 2, Input Active 27 Air Inlet or Intake Air Temp... To sustain its electric field across them to short that collapsing voltage ground is. The ground signal on and off to rapidly pulse the injector should be robust, the! No voltage present, all wires should read high resistance to ground in the to... Wires on each injector at the appropriate time thru the drivers in the injector runing open i...

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