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