When ignition key on or engine running, injector N4 always has power (short) and injector always open and has fuel leak to cylinder. what I need to check for fix this problem. I think is ECM problem?
I am going to assume that you verified this by unplugging the injector and seeing constant power across the pins in that connector, and capmparing to the another good injector. if you have not done so. that is your first reading to take with a meter.
a breif description of how it typically works:
nomally, there is a single common for all the injectors. typically, it is a positive signal energised by the ecm/ecu either directly, or via relay. and usually fused. sometimes, on v8, and some v6's there are 2 commons. then, each injector is individually actuated through the ecu.
next test- if you find the common positive voltage, then the other wire should read nothing with the engine not runing. do an ohm check to ground. you will likely find that n4 only is reading continuity on the non-common wire. trace the harness to the main harness plug. it may be a disconnect in the engine bay, at the firewall, or a complete run to the ecm. unplug it. it may require wd-40 and some massaging fennesse. force is not the first answer to pulling it apart, and the clip may not release normally, reqiring a pick in there to unlatch it. if you still have continuity, then you have a short in the harness grounding between the 2 points. if you do not, then trace the wire from the connection point you disconnected, at least 5 inches away. you can do a pinout check, to find the correct wire. test all to verify you have the correct wire and then you will cut this wire, if you know you can reliably re-attach the wires together. before you do this, if it is not at the ecm test the corresponding pin at the other connection you unplugged from, to make sure you are not reading ground continuity (you may need to find the ground pin in that plug, as it may be the same plug that feeds the ecm ground.) then, unplug the ecm, and re-connect the disconnect, if applicable, and re-check continuity. now, you move to cutting the wire, if the ground is only present with the ecm connected. plug the injector back in and turn the key on. if you receive close to common voltage on the injector side of the cut wire and ground on the ecm side, then there is an internal short in the ecm/ecu. if the system uses a common ground, then all of this is inverted, with the positive battery/ign. as reference, not ground
SOURCE: replacement of a head gasket on 2.5 liter nissan altima 2002
frajogag: First off, be aware that these bolts are "torque to yield" bolts (streach bolts). What this means is that instead of torqueing the head bolts to a specific torque specification, they are torqued down to a set spec and then tightened by rotating the bolts a certain angle, like 90 degrees. and all of them are turned the same amount.
This means that the shanks of the bolts must be checked to make sure they are not too thin (or the bolt has already stretched beyond limits and is prone to snap if used)
Here is how you check the bolts. Measure the bolt using a micrometer, at the base, or within the first 13mm from the end where it threads in. Then go to about 10mm before the threads end heading toward the top of the bolt. There should not be more than a 0.23mm (.0091 inch) or less difference or the bolt should be discarded.
Torque the bolts down to 98.1Nm ( 72.ft lb)
Looking at the head from the side, so you are looking at the full length from side to side, I will number the head bolts in this fashion.
#1 & 2 are directly in front of you and in the center of the cylinder head crossing it width wise.
#3&4 are to the left of #1&2, / #5&6 are to the right of #1&2
#7&8 are to the left of #3&4 / #9$10 are to the right of #5&6
Now, you have the sequence.
After the initial pull, back off all the bolts in the same sequence and then retorque them to 36 Nm ( 28 ft lb)
Using a torque angle wrench or having the ability to accurately judge turning angles. Rotate (clockwise) to a 75 degree angle. do this to all the bolts using the sequence I had provided.
Rotate the bolts (clockwise) 75 degrees again on all bolts in the same sequence. The proceedure is complete!
SOURCE: i have a 2002 nissan altima 2.5L with an oil leak
If you are talking about the spot being black on concrete or the oil on the bottom of the engine?
Oil loves dirt also depending on the type of filter you are using will determine the color or how clean your oil is. I recommend using WIX they are not cheap but they do work. After a couple of oil changes you will notice your oil will not appear so black. The black is deposits in the oil.I also recommend using a good brand name oil that won't break down and changing every 3000mi.
SOURCE: how to remove broken key in Ignition switch
If your key is magnetic and it is not jambed in there to much you may be able to get a magnet and pull it out. If it is stuck pretty bad you will have to take the steering column apart, but trying calling a lock smith first, he may be able to help.
SOURCE: 99 nissan altima 4dr. key will not turn ignition
sometimes if the steering wheel is in a bind the switch will not turn try turning the wheel a bit while at the same time turning the switch good luck
Ford Crown Victoria, Mercury Grand Marquis, Marauder, Lincoln Town Car 1999-2005
4.6L V8 - Auto 2
Trouble Code: P0201
Cylinder 1 Injector Circuit Malfunction
Possible Causes:
Injector 1 connector is damaged, open or shortedInjector 1 control circuit is open, shorted to ground or to powerPCM has failed (the injector driver circuit may be damaged)
Trouble Code: P0202
Cylinder 2 Injector Circuit Malfunction
Possible Causes:
Injector 2 connector is damaged, open or shortedInjector 2 control circuit is open, shorted to ground or to powerPCM has failed (the injector driver circuit may be damaged)
Trouble Code: P0203
Cylinder 3 Injector Circuit Malfunction
Possible Causes:
Injector 3 connector is damaged, open or shortedInjector 3 control circuit is open, shorted to ground or to powerPCM has failed (the injector driver circuit may be damaged)
Trouble Code: P0204
Cylinder 4 Injector Circuit Malfunction
Possible Causes:
Injector 4 connector is damaged, open or shortedInjector 4 control circuit is open, shorted to ground or to powerPCM has failed (the injector driver circuit may be damaged)
Trouble Code: P0205
Cylinder 5 Injector Circuit Malfunction
Possible Causes:
Injector 5 connector is damaged, open or shortedInjector 5 control circuit is open, shorted to ground or to powerPCM has failed (the injector driver circuit may be damaged)
Trouble Code: P0206
Cylinder 6 Injector Circuit Malfunction
Possible Causes:
Injector 6 connector is damaged, open or shortedInjector 6 control circuit is open, shorted to ground or to powerPCM has failed (the injector driver circuit may be damaged)
Trouble Code: P0207
Cylinder 7 Injector Circuit Malfunction
Possible Causes:
Injector 7 connector is damaged, open or shortedInjector 7 control circuit is open, shorted to ground or to powerPCM has failed (the injector driver circuit may be damaged)
Trouble Code: P0208
Cylinder 8 Injector Circuit Malfunction
Possible Causes:
Injector 8 connector is damaged, open or shortedInjector 8 control circuit is open, shorted to ground or to powerPCM has failed (the injector driver circuit may be damaged)
Trouble Code: P0219
Engine Over-Speed Condition
Possible Causes:
Engine operated in the wrong transmission gear positionExcessive engine speed with gear selector in Neutral positionWheel slippage due to wet, muddy or snowing conditions
Trouble Code: P0230
Fuel Pump Primary Circuit Malfunction
Possible Causes:
FP or FSV circuit is open or shortedFuel pump relay VPWR circuit openFuel pump relay is damaged or has failedPCM has failed
Trouble Code: P0231
Fuel Pump Primary Circuit Low Input
Possible Causes:
FP or FSV circuit is open or shorted to groundFuel pump relay VPWR circuit open or fuel pump relay failedPCM has failed
Trouble Code: P0232
Fuel Pump Secondary Circuit High Input
Possible Causes:
Fuel pump relay contacts always closedFuel pump ground circuit has high resistanceFuel pump secondary circuit is shorted to powerLow speed fuel pump relay damaged or related circuit problem
Trouble Code: P0297
Vehicle Over-Speed Condition
Possible Causes:
The code indicates the vehicle was driven at very high engine speed (rpm) for too long. The PCM temporarily prohibits high engine speed by disabling the fuel injectors with this code set.
Trouble Code: P0300
Random Misfire Detected
Possible Causes:
Base engine mechanical fault that affects two or more cylindersFuel metering fault that affects two or more cylindersFuel pressure too low or too high, fuel supply contaminatedEVAP system problem or the EVAP canister is fuel saturatedEGR valve is stuck open or the PCV system has a vacuum leakIgnition system fault (coil, plug) affecting two or more cylindersMAF sensor contamination (it can cause a very lean condition)Vehicle driven while very low on fuel (less than 1/8 of a tank)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0301
Cylinder Number 1 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 1Fuel delivery component problem that affects only Cylinder 1 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 1TSB 02-16-2 contains repair help for this code (LS & T-Bird)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0302
Cylinder Number 2 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 2Fuel delivery component problem that affects only Cylinder 2 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 2TSB 02-16-2 contains repair help for this code (LS & T-Bird)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0303
Cylinder Number 3 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 3Fuel delivery component problem that affects only Cylinder 3 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 3TSB 02-16-2 contains repair help for this code (LS & T-Bird)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0304
Cylinder Number 4 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 4Fuel delivery component problem that affects only Cylinder 4 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 4TSB 02-16-2 contains repair help for this code (LS & T-Bird)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0305
Cylinder Number 5 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 5Fuel delivery component problem that affects only Cylinder 5 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 5TSB 02-16-2 contains repair help for this code (LS & T-Bird)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0306
Cylinder Number 6 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 6Fuel delivery component problem that affects only Cylinder 6 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 6TSB 02-16-2 contains repair help for this code (LS & T-Bird)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0307
Cylinder Number 7 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 7Fuel delivery component problem that affects only Cylinder 7 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 7TSB 02-16-2 contains repair help for this code (LS & T-Bird)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0308
Cylinder Number 8 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 8Fuel delivery component problem that affects only Cylinder 8 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 8TSB 02-16-2 contains repair help for this code (LS & T-Bird)TSB 03-14-4 contains repair help for this code for COP ignition
Trouble Code: P0315
Unable to Learn Crankshaft Variation
Possible Causes:
Inspect the CKP sensor for damageInspect the CKP sensor for debris on the rotorInspect the crankshaft pulse wheel for damaged teethInspect the crankshaft pulse wheel for wobble (loose condition)
Trouble Code: P0316
Misfire in the First 1000 Revolutions
Possible Causes:
Check for CMC DTC P0136, P0156, P0171, P0172, P0175, P1130 and P1150. Repair these adaptive fuel and HO2S codesCheck for any other CMC in memory. Repair these codes first!Ignore P1000 codes that set during KOEO and KOER Self-Test
Trouble Code: P0320
Ignition Engine Speed Input Circuit Malfunction
Possible Causes:
Inspect for problems with an Aftermarket 2-way radioInspect for signs of "arcing" at one or more of the ignition coilsInspect the Profile Ignition Pickup (PIP) unit inside distributor (check for damage or corrosion at the PIP sensor connector)PIP sensor is damaged or it has failed (distributor models)Ignition control module (ICM) has failed (Distributorless models)Trouble Code: P0340
Camshaft Position Sensor Circuit Malfunction
Possible Causes:
CMP sensor circuit is open or shorted to groundCMP sensor circuit is shorted to powerCMP sensor ground (return) circuit is openCMP sensor installation incorrect (Hall-effect type)CMP sensor is damaged or CMP sensor shielding damagedPCM has failedTSB 02-22-1 contains repair information for this trouble code
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After weekend, I retest wirehorness and no more fuel leak from injector. Put on new spark plugs and engine runs fine at this time. I don't know what happened, it is fix self. I still think the car has a problem with the module(ECM). Thanks for advise.
i suspect 2 possibilities of what happened.
- first, it may be possible that there was a short, and by manipulating the harness, you moved the short away from ground.
-second, the ecm did, in fact, have an issue, and resolved via a discharge cycle, which i have seen happen.
- either way, there is a possibility that the problem may present itself again. my suggestion: if and when it happens, first thing you do, while it is still active and before anything else, unplug the ecm and test for a short on the injector return, to isolate which problem it has. if it was the ecu, this could have possibly been caused by a voltage spike. if that was a possibility, then it is likely that the problem will not occur again. good luck
-heath h-
Thanks for the advice. I think I moved the short away from ground. by manipulating the harness.
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