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Car Forum / Nissan / Nissan Cars / October 200588 Nissan King Cab Z24 Engine .. Need help with diagnosing a fuel problem .. possible ECU problem
I am trying to use the ECU to diagnose a problem with my truck. It will crank but will not start. When I turn the ignition, there is no sound of the fuel pump powering up. So I have a feeling it is the fuel pump that is the problem. I see when I look at my ECU it flashed both red and green lights at the same time 1 long flash 2 long flashes 3 short 4 short 5 short These I have read are displaying modes. I can not though get the ECU to show me any prpblems it has found by only flashing me the red diode to give me the problem code. How do I get it to flash me the codes instead of the modes? I am at a loss here :) I would outright replace the fuel pump, but I was reading that a problem similar to mine, turned out to be a problem with their ECU itself. Anyways, any help would be greatly appreciated :) Thanks Here's a site that lists the procedure for just about everything: http://www.troublecodes.net/technical/ And here are the code definitions: http://www.troublecodes.net/Nissan/88-9495pthqust.shtml Good luck and let us know what you find. Wil >I am trying to use the ECU to diagnose a problem with my truck. It >will crank but will not start. When I turn the ignition, there is no [quoted text clipped - 22 lines] > >Thanks This was the site that I got the info on what the flashing was .. but it does not say how to make it stop flashing the modes and start flashing the trouble codes. All it flashes is the modes .. the same sequence of flashes over and over listed below in the first thread. After reading the info again on the site .. I still cant see how to select a mode.. or is it even possible?? I know there is something wrong, but it isnt flashing the code, which makes me believe that you have to be able to select a mode before you get the trouble code.. Still in need of some help here :) >Here's a site that lists the procedure for just about everything: >http://www.troublecodes.net/technical/ [quoted text clipped - 32 lines] >> >>Thanks > This was the site that I got the info on what the flashing was .. but > it does not say how to make it stop flashing the modes and start [quoted text clipped - 39 lines] >>>How do I get it to flash me the codes instead of the modes? I am at a >>>loss here :) ENTERING SELF-DIAGNOSTICS 1) Turn ignition switch to ON position. Use a screwdriver to turn ECM diagnostic mode selector fully clockwise. 2) Wait for inspection lights to begin flashing. At this time, inspection lights will flash mode options (i.e., one flash for Mode I, 2 flashes for Mode II, etc.). As soon as inspection light flashes desired mode number (3 flashes for self-diagnostic mode), ***DID YOU DO THIS STEP NEXT?*** turn mode selector off (fully counterclockwise) 3) If mode selector is kept in ON position (fully clockwise), mode selections will continuously cycle. This cycling will not erase memory. >>>I would outright replace the fuel pump, but I was reading that a >>>problem similar to mine, turned out to be a problem with their ECU [quoted text clipped - 3 lines] >>> >>>Thanks >> This was the site that I got the info on what the flashing was .. but >> it does not say how to make it stop flashing the modes and start [quoted text clipped - 52 lines] >3) If mode selector is kept in ON position (fully clockwise), mode >selections will continuously cycle. This cycling will not erase memory. OK I get what you are saying .. although Im not sure where you got your text from seeing that I scoured the website and could not find where it says to use a screwdriver to do anything. LIke I said before .. I do not know what the MODE SELECTOR looks like. If I knew that I could turn it. All there is on the ecu is a power ON/OFF switch. Which I doubt can be rotated. So that leaves me where I was last night still :) >>>>I would outright replace the fuel pump, but I was reading that a >>>>problem similar to mine, turned out to be a problem with their ECU [quoted text clipped - 3 lines] >>>> >>>>Thanks >>>This was the site that I got the info on what the flashing was .. but >>>it does not say how to make it stop flashing the modes and start [quoted text clipped - 71 lines] >>>>> >>>>>Thanks Is there an access hole on the side of ECU with a screw slot visible? If so it is the spring center loaded switch actuated by turning it in the proper direction with a screwdriver. http://www.troublecodes.net/Nissan/pre88nssn.shtml http://www.superstreetonline.com/techarticles/20298/ Ill go and check again right now, but Im almost positive that there is no slot on the ECU. There is an on,off switch on the left side, and on the right side is the lights. On the side facing the passenger door there are a ton of wires going in, and opposite that side has nothing at all. Ill check back in with the good or bad news. J >>>>This was the site that I got the info on what the flashing was .. but >>>>it does not say how to make it stop flashing the modes and start [quoted text clipped - 77 lines] >http://www.troublecodes.net/Nissan/pre88nssn.shtml >http://www.superstreetonline.com/techarticles/20298/ Ok.. I know for sure now that there is NO slot on the ECU for which to select a mode. I have no idea what to do next :) >Ill go and check again right now, but Im almost positive that there is >no slot on the ECU. There is an on,off switch on the left side, and on [quoted text clipped - 87 lines] >>http://www.troublecodes.net/Nissan/pre88nssn.shtml >>http://www.superstreetonline.com/techarticles/20298/ > Ok.. I know for sure now that there is NO slot on the ECU for which to > select a mode. I have no idea what to do next :) [quoted text clipped - 90 lines] >>>http://www.troublecodes.net/Nissan/pre88nssn.shtml >>>http://www.superstreetonline.com/techarticles/20298/ Sorry, my mistake. http://www.troublecodes.net/Nissan/ 3. On Pathfinder, ***PICKUP*** and Van models, proceed as follows: Turn diagnostic mode selector on ECU to On position and wait until inspection lamps flash. Note number of flashes, then immediately turn diagnostic mode selector to Off position. I'm assuming that if you turn the switch off after 3 flashes you will be in mode three. Then you can read your error codes. Does this sound right to you? Sorry, my station wagon had the rotary switch thingy so I just pissing in the wind here. >> Ok.. I know for sure now that there is NO slot on the ECU for which to >> select a mode. I have no idea what to do next :) [quoted text clipped - 102 lines] >to you? Sorry, my station wagon had the rotary switch thingy so I just >pissing in the wind here. I have never seen a nissan ECM with a on/off swith. I have only seen rotary selectors. I get the feeling you may be looking at an add on security or something els that is aftermarket. find a repair manual and verify you are looking at the ECM. do you have both a red and green light? I have seen some ECM improperly mounted after previous repairs and the plastic shild will block acces to the mode selector. as for your fuel pump problem after dealing with the ECM issue. Check to see if the ECM is supplying ground to the fuel pump relay during cranking I have seen many ECM's fail in this manor. If this is the case let me know. there is a way to bypass this function of the ECM using an additional relay, which is much cheaper than replacing the ECM. Spat >>>Ok.. I know for sure now that there is NO slot on the ECU for which to >>>select a mode. I have no idea what to do next :) [quoted text clipped - 118 lines] > > Spat Neither have I but I have never looked at the 88-94 Pathfinder, Pickup, or Van. Are you saying that they have the rotary selector like the cars? If so, then this page must be wrong. http://www.troublecodes.net/Nissan/ >>>>Ok.. I know for sure now that there is NO slot on the ECU for which to >>>>select a mode. I have no idea what to do next :) [quoted text clipped - 122 lines] >If so, then this page must be wrong. >http://www.troublecodes.net/Nissan/ Well that is very intresting I must be mistaken, but I worked as a Nissan Tech for ten years and my specialty was electrical and engine performance. I can not say specificaly that I have work on those particular models in regards to the ECM. I find it hard to believe that I would have not but possible. I do remember seeing a few trucks that went thru a custome upgrade center where nissan aproved add-ons where performed before reaching the dealer. these trucks if I recall correctlly all came from the plant in mexico. however the document explains the procedore clearly if this is in fact the type ECM he has. Spat >>>>Ok.. I know for sure now that there is NO slot on the ECU for which to >>>>select a mode. I have no idea what to do next :) [quoted text clipped - 122 lines] >If so, then this page must be wrong. >http://www.troublecodes.net/Nissan/ The ECM I have on the truck is under the passenger seat. It has a on/off switch towards the rear of the truck, and the flashing red and green lights face the front of the truck. The ECM itself was covered on the top by a black peice of plastic which was a bitch to get off because it had double sided tape holding it down. Alas after even taking that off there is no mode selector that I can see on this box. I do have both red and green lights, and they flash together in the same order, over and over again in the same sequence. 1 long, 2 long, 3 short, 4 short, 5 short .. then repeat I hope that gives you an idea of what Im dealing with in regards to the ECM and its features. On the note of checking the relay from the ECM, how would I go about doing that? Will it be in the book if I go buy one? The wierd thing about this whole thing, is that my truck ran great up until one day it ran crappy for about 20 mins. It then ran great for about an hour the next day before, without any sort of sign of a problem the engine stopped getting fuel. It didnt sputter or anything like that, it just didnt go when I hit the gas, and thats when I pulled over. I hope that sheds some insight as to what might be wrong. I appreciate all the feedback I have been getting .. hopefully something I said here can help one of you guys to help me solve the problem, as I am not a huge mechanic myself :) Thanks .. and hope to hear from you soon J >>>>>Ok.. I know for sure now that there is NO slot on the ECU for which to >>>>>select a mode. I have no idea what to do next :) [quoted text clipped - 155 lines] > >J Well if yours does have the on/off switch then this would be the correct procedure to retrieve the codes and you should do just that heres the link again http://www.troublecodes.net/Nissan/ after retrieving codes reset the system. some codes will disable some systems. If you are positive your fuel pump is not working you need to find out why. unfortunatly I have not found a service manual with much info on this except the nissan shop manual. you can order one for about $75. it has a complete schematic of all electrical. The haynes manual has most of the electrical systems but lacks detail and I cant find anything on the fuel system in it as far as electrical controle. my haynes manual was printed in 96 so newer manuals may be improved I just dont know. I ordred a nissan manual my self because i was tired of not being able to find info. the downfal to the nissan manual is it is specific to only one year so it will not give me any info on your particular model. If you plan to keep your truck for a long time it is a good investment to get the nissan manual otherwise you will just have to suffer. but just to have your problem diagnosed but not repaired is likley to cost you more than the manual no matter how simple or difficult the problem. you may want to switch the fuel pump relay with a known good one from a system that is not related to engine controle nissan uses the same relay in many systems. just look for one with the same shape, color and schematic etched in the top of it. my truck uses a green one that is the same as the horn. Spat >>>>>Ok.. I know for sure now that there is NO slot on the ECU for which to >>>>>select a mode. I have no idea what to do next :) [quoted text clipped - 156 lines] > > J Did you try turning off the switch immediately after the 3 short flashes? Accordingly, this should get you into mode 3.Once it is in mode 3 it should flash your error codes. >>>>>>Ok.. I know for sure now that there is NO slot on the ECU for which to >>>>>>select a mode. I have no idea what to do next :) [quoted text clipped - 159 lines] >flashes? Accordingly, this should get you into mode 3.Once it is in mode >3 it should flash your error codes. Do you mean see the three short flashes of red/green then turn it off .. and KEEP it off until I see red flashes only? Does it work that way? I assumed that if I shut it off it wouldnt flash anything at all. Which is why I havent really thought that would work .. its too late to try it right now .. might give it a go tomorrow >>Did you try turning off the switch immediately after the 3 short >>flashes? Accordingly, this should get you into mode 3.Once it is in mode >>3 it should flash your error codes. > > Do you mean see the three short flashes of red/green then turn it off > .. and KEEP it off until I see red flashes only? Yep. Does it work that > way? That's what the instructions say. http://www.troublecodes.net/Nissan/ I assumed that if I shut it off it wouldnt flash anything at all. > Which is why I havent really thought that would work .. its too late > to try it right now .. might give it a go tomorrow Like I said before I never had to do this cause my nissan had the rotory switch. Fuel pump relay! Thanks,Ripper We Need DEATH SQUADS in the USA to Get Rid of Terrorists AND Street Gangs! BOYCOTT CLASSMATES.COM for their PHONY FREE TRIAL MEMBERSHIP (NOT) I found the relay fuse, it looks ok to me. But hard to say if its working or not unless I get it tested. On another note, since this motor has 8 spark plugs.. which side gets the intake plugs, and which side gets the exhaust plugs? J >Fuel pump relay! > >Thanks,Ripper >We Need DEATH SQUADS in the USA to Get Rid of Terrorists AND Street >Gangs! >BOYCOTT CLASSMATES.COM for their PHONY FREE TRIAL MEMBERSHIP (NOT) >Fuel pump relay! > >Thanks,Ripper >We Need DEATH SQUADS in the USA to Get Rid of Terrorists AND Street >Gangs! >BOYCOTT CLASSMATES.COM for their PHONY FREE TRIAL MEMBERSHIP (NOT) copied from my reply on your first post: I have never seen a nissan ECM with a on/off swith. I have only seen rotary selectors. I get the feeling you may be looking at an add on security or something els that is aftermarket. find a repair manual and verify you are looking at the ECM. do you have both a red and green light? I have seen some ECM improperly mounted after previous repairs and the plastic shild will block acces to the mode selector. as for your fuel pump problem after dealing with the ECM issue. Check to see if the ECM is supplying ground to the fuel pump relay during cranking I have seen many ECM's fail in this manor. If this is the case let me know. there is a way to bypass this function of the ECM using an additional relay, which is much cheaper than replacing the ECM. Spat The ECM I have on the truck is under the passenger seat. It has a on/off switch towards the rear of the truck, and the flashing red and green lights face the front of the truck. The ECM itself was covered on the top by a black peice of plastic which was a bitch to get off because it had double sided tape holding it down. Alas after even taking that off there is no mode selector that I can see on this box. I do have both red and green lights, and they flash together in the same order, over and over again in the same sequence. 1 long, 2 long, 3 short, 4 short, 5 short .. then repeat I hope that gives you an idea of what Im dealing with in regards to the ECM and its features. On the note of checking the relay from the ECM, how would I go about doing that? Will it be in the book if I go buy one? The wierd thing about this whole thing, is that my truck ran great up until one day it ran crappy for about 20 mins. It then ran great for about an hour the next day before, without any sort of sign of a problem the engine stopped getting fuel. It didnt sputter or anything like that, it just didnt go when I hit the gas, and thats when I pulled over. I hope that sheds some insight as to what might be wrong. I appreciate all the feedback I have been getting .. hopefully something I said here can help one of you guys to help me solve the problem, as I am not a huge mechanic myself :) Thanks .. and hope to hear from you soon J >>Fuel pump relay! >> [quoted text clipped - 20 lines] > >Spat As I see it you are out of your league, take it to the dealer and they will use their checker box and tell you IF there are any codes. SIMPLE! Then you can go buy a tank sender unit that has failed. SIMPLE!! > The ECM I have on the truck is under the passenger seat. It has a > on/off switch towards the rear of the truck, and the flashing red and [quoted text clipped - 53 lines] >> >>Spat Easy enough perhaps if it were running. It owuld cost me over 100 bucks to tow it to the dealership. Hence Im here looking for easy ansswers (if any) first :) >As I see it you are out of your league, take it to the dealer and they >will use their checker box and tell you IF there are any codes. SIMPLE! [quoted text clipped - 57 lines] >>> >>>Spat I think I can help, I have 89 edition. Had similar problem on the way to work one morning. Started great, drove 1/3 to work and died, started almost right away. drove another 1/3, died, took 10 min to start. drove to work.left work at end of day, 1/3 home died, would not re-start. The ECM will not tell you if the pump has failed!Try this, with a little common sense, I can not hold your hand!!Remove the air filter, pour a small amount of fuel into the intake. Now try to start. If the unit fires quickly once you have a pump problem, I would be happy to walk you through th procedure. mine was two corroded wires at the pump. now I have other issues and need help of my own. I also have two manuals for this unit am in this chat room under "need help" Thanks. |
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