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  #31  
Old 11-01-2010, 01:30 AM
streamcast streamcast is offline
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1995 Nissan sentra
 
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Originally Posted by galleyne View Post
Greetings All, Thanks Steamcast. I decided to s;pend some time trying to under the various wiring diagrams and connectors etc. I was able to determine that the Camshaft Sensor has continuity with the ECM and ground. This eliminates the Camshaft circuit since I had already compared the old Camshaft against a new one and got similar results. It was might cold today so I could not spend too much time outside. I hope that the weather will be bit better tomorrow since I would like to get underneath the car and check the Crankshaft sensor and its harness. Once these are out of the way I will reconnect the ECM and start following your recommendations. Just looking forward do you know of any place where I can purchase a rebuilt/old ECM if I finally come to the conclusion that mine is defective? The dealter gave me a ballpark figure of $900. If that is the case I might as well try and purchase a sminilar sentra. Right now a used car dealer has one with 240000km and asking approx $2000. I told him I would offer 1500. I finally realized what those 3 connectors (green, blue, and grey) next to the ECM are for. The green is actually F23. Again thanks very much for your help it is greatly appreciated.

Geoffrey
Getting a used ECM maybe a bit difficult as the ECM part numbers have to be the same. However before you purchase another car for parts from someone that is one thing to watch out for
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  #32  
Old 11-03-2010, 06:35 PM
galleyne galleyne is offline
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2001 Sentra
 
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Greetings,
I had a go at the car this afternoon. I tried removing the crankshaft harness but it was too difficult. The car is on an incline(uphill), you are lying on your back at an angle, you hardly have space and you can only feel the connector as you attempt to remove it. I did check the resistance between pins 2 & 3 and got infinity. I made the assumption that if the cranshaft sensor was defective that I should get a code since i did not get one for the camshaft sensor and when I compared that sensor against a new one it seemed to be good. I replaced the Camshaft sensor and reconnected the harness. I reconnected the ECM and checked the voltage at pin 31. I got 12 volts with the ignition off. When I turn the ignition on the voltage stayed at 12 volts. I got my wife to crank the engine while I checked the voltage, it only dropped to around 10 volts instead of zero. I grounded this terminal and got her to try starting but no luck. I also checked for voltage on pins 2 and 3 of the idle motor valve. I no voltgs. this was espected since it gets it voltage from the ECM relayand since that relay is not operating the idle motor cannot function. I also notice that my check engine light was not coming on when I turn the ignition on. I did not have the EC for that that condition and since it was starting to get dark and cold I decided to shut it down for the night. I subsequently was able to find the EC for the check engine light. I will check the appropiate ECM pin/terminal and see if the readings are ok. I am beginning to believe that the ECM may be the culprit. I will also remove the #4 spark plug, ground pin 31 and try starting to see if I am getting a spark. Will probably try that on the weekend.

Geoffrey
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  #33  
Old 11-04-2010, 01:40 AM
streamcast streamcast is offline
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GALLEYNE
You say the engine light do not com on now. Do you have access to the ecm with scan tool. If not search for a broken wire at the fuse block by the battery. Remove the battery and holder and strip the covering of the harness from just by the head light connector look for a White and blue tracer wire it is small, pull on it with a little force and see if comes apart, if it do strip out up furthur and find the other end and make the repair.
Let me know how it works out.
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  #34  
Old 11-04-2010, 02:12 PM
wakayama
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I check and light flashes while cranking.

Thank you for help. Now what do I need to check?
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  #35  
Old 11-04-2010, 02:37 PM
streamcast streamcast is offline
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Originally Posted by wakayama View Post
I check and light flashes while cranking.

Thank you for help. Now what do I need to check?
Go to the knowledge base section and download sentra manual section ec. Go to page ec pg 168 for non california model. Follow the pinouts on those to pages but check at the relay behind glove box. Make sure you have what you are supposed to have if you do not let us know what you do not have. Batt volts on 1, 3,6 and 5 of relay. Terminal 2 should have approx 1 volt and switch to batt volts.
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  #36  
Old 11-04-2010, 02:42 PM
galleyne galleyne is offline
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Greetings !
Hello Streamcast I do have a code reader I can check and see what codes I am getting. Sometimes in the heat of trying to find a problem we sometimes overlook the obvious. I really cannot say if I realized the SES light was working before. It is raining here this afternoon and it is like night outside will try and give it a go tomorrow afternoon. I notice you are also from Canada. I live in Montreal.
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  #37  
Old 11-06-2010, 06:14 PM
galleyne galleyne is offline
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Greetings,
I had a go at the car this afternoon. I reconnected the ecm module and turn the ingnition on. I noticed that the check engine light was on. I believe the reason it was off the last time reported was I probably did not seat the ecm connector properly. The ECM relay is working fine I can hear the sounds of the contacts. the voltage at pin 31 goes from battery to to less than 1 volt when I put the ignition on. I also see a battery voltage at pins e and 5 of the ecm relay when I turn the ignition on.
Here is where the problem seems to lie. I get battery voltage at pin6 of the relay when the ignition is off. When I turn the ignition on the voltage at pins 6 and 7 of the ecm realy go to 0. I disconnected all 4 sparkplugs connector to make certain that no connector was shorting to ground. I turned the ignition on with the same reults. I checked pin 3 of each spark plug connector to ground and got an open circuit. I also checked pin 7 of the ecm relay with the ignition off to ground. I got an open circuit. I ckecked for continuity between pin3 of all 4 sparkplug harnesses. They all checked ok. I also checked from pin3 of the sparkplugh harness to pin 7 of the relay for continuity. I have continuity. It seems that the problem may be the ignition condenser. Can you tell me where to FIND/LOCATE? The fuel pump seems to be going now since I place my ear by the gas tank filler tube with the gas cap off while my wife turned the ignition on.

Geoffrey
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  #38  
Old 11-07-2010, 04:52 AM
wakayama
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" knowledge base section " Sentra 2001 manual page 168.

This page show car audio? or I'm looking for wrong places?

Thank you.
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  #39  
Old 11-07-2010, 05:44 AM
streamcast streamcast is offline
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Quote:
Originally Posted by galleyne View Post
Greetings,
I had a go at the car this afternoon. I reconnected the ecm module and turn the ingnition on. I noticed that the check engine light was on. I believe the reason it was off the last time reported was I probably did not seat the ecm connector properly. The ECM relay is working fine I can hear the sounds of the contacts. the voltage at pin 31 goes from battery to to less than 1 volt when I put the ignition on. I also see a battery voltage at pins e and 5 of the ecm relay when I turn the ignition on.
Here is where the problem seems to lie. I get battery voltage at pin6 of the relay when the ignition is off. When I turn the ignition on the voltage at pins 6 and 7 of the ecm realy go to 0. I disconnected all 4 sparkplugs connector to make certain that no connector was shorting to ground. I turned the ignition on with the same reults. I checked pin 3 of each spark plug connector to ground and got an open circuit. I also checked pin 7 of the ecm relay with the ignition off to ground. I got an open circuit. I ckecked for continuity between pin3 of all 4 sparkplug harnesses. They all checked ok. I also checked from pin3 of the sparkplugh harness to pin 7 of the relay for continuity. I have continuity. It seems that the problem may be the ignition condenser. Can you tell me where to FIND/LOCATE? The fuel pump seems to be going now since I place my ear by the gas tank filler tube with the gas cap off while my wife turned the ignition on.

Geoffrey
Hey
I have not seen the condensor go but if you want to check it it is located in the harness going across the harness between coils and injector connectors, you will see it sticking off and taped up.
I think you need an ecm BASED ON THE ELECTRICAL RESULTS ELECTRICAL SEEMS FINE.
If the coils do not fire and fuel system not working it is a result of either an input or output miscalculation from the ECM. Poss cam/ckp sensor etc.
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  #40  
Old 11-07-2010, 05:47 AM
streamcast streamcast is offline
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Quote:
Originally Posted by wakayama View Post
" knowledge base section " Sentra 2001 manual page 168.

This page show car audio? or I'm looking for wrong places?

Thank you.
Go to the knowledge base section and download sentra manual section EC. Go to page ec pg 168 for non california model. Follow the pinouts on those to pages but check at the relay behind glove box. Make sure you have what you are supposed to have if you do not let us know what you do not have. Batt volts on 1, 3,6 and 5 of relay. Terminal 2 should have approx 1 volt and switch to batt volts.
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  #41  
Old 11-07-2010, 06:33 AM
wakayama
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Knowledgebase - Sentra - Nissanhelp.com Forums

from here, I download sentra manual. but 168? I can download whole manual, not only EC part.

Page 168 : " Do-it-yourself 8-11 '??
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  #42  
Old 11-07-2010, 08:24 AM
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mpe235 mpe235 is offline
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Quote:
Originally Posted by galleyne View Post
Greetings,
I had a go at the car this afternoon. I reconnected the ecm module and turn the ingnition on. I noticed that the check engine light was on. I believe the reason it was off the last time reported was I probably did not seat the ecm connector properly. The ECM relay is working fine I can hear the sounds of the contacts. the voltage at pin 31 goes from battery to to less than 1 volt when I put the ignition on. I also see a battery voltage at pins e and 5 of the ecm relay when I turn the ignition on.
Here is where the problem seems to lie. I get battery voltage at pin6 of the relay when the ignition is off. When I turn the ignition on the voltage at pins 6 and 7 of the ecm realy go to 0. I disconnected all 4 sparkplugs connector to make certain that no connector was shorting to ground. I turned the ignition on with the same reults. I checked pin 3 of each spark plug connector to ground and got an open circuit. I also checked pin 7 of the ecm relay with the ignition off to ground. I got an open circuit. I ckecked for continuity between pin3 of all 4 sparkplug harnesses. They all checked ok. I also checked from pin3 of the sparkplugh harness to pin 7 of the relay for continuity. I have continuity. It seems that the problem may be the ignition condenser. Can you tell me where to FIND/LOCATE? The fuel pump seems to be going now since I place my ear by the gas tank filler tube with the gas cap off while my wife turned the ignition on.

Geoffrey
I think you probably have a partially broken wire to the ecm relay. There may not be enough connection to carry the load to the relay. Check the white wire with blue stripe coming out of the under hood fuse box.
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  #43  
Old 11-07-2010, 09:52 AM
streamcast streamcast is offline
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I am not disagreeing but usually the white blue wire break or partial break usually results in no SES light or vehicle starting but stalling. The white and blue wire powers up the ECM relay with a ground supply from ecm.
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  #44  
Old 11-07-2010, 09:54 AM
streamcast streamcast is offline
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Quote:
Originally Posted by wakayama View Post
Knowledgebase - Sentra - Nissanhelp.com Forums

from here, I download sentra manual. but 168? I can download whole manual, not only EC part.

Page 168 : " Do-it-yourself 8-11 '??
Service manual not owners manual, page 168 is the power supply wiring diagram.
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  #45  
Old 11-07-2010, 01:42 PM
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Quote:
Originally Posted by streamcast View Post
I am not disagreeing but usually the white blue wire break or partial break usually results in no SES light or vehicle starting but stalling. The white and blue wire powers up the ECM relay with a ground supply from ecm.
I agree but I think I saw in one of the posts about the power going away when he was checking it. That would make me think there was a poor connection. We see that with murano blower motors quite a bit. The motor doesn't work. If you unplug the connector and check it you will find power and ground. If you plug it in and test the power wire turns to ground because the relay has a poor connection.
An easy way to rule this out would be to run a jumper wire to the white/blue wire at the relay and see if the car will start.
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