IPDM - ECU relay problems, symptoms and solution. - Page 25 - Nissan Titan Forum
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post #361 of 368 (permalink) Old 10-25-2016, 06:05 AM
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Re: IPDM - ECU relay problems, symptoms and solution.

Is this an intermittent problem or is your truck down hard? Are you using a scanner capable of checking communication between the different control modules (computers)?

I had an intermittent "Crank, No-Start" problem that took months to figure out. If it's down hard that should make it easier for troubleshoot. Using one of those capable scanners is important though since any breakdown in communication between any control module can keep the truck from starting.


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Originally Posted by tinygoracing View Post
Ok after reading 24 pages of problems of the famous no start my eyes are killing me Here is my problem


2005 Nissan Titan 4x4 Crew Cab with towing package


Started off Thursday evening myself and a pretty reputable mechanic changed front pads and rotors on my truck drove the truck next day it run fine. Came home and parked the truck to come out the next morning to a truck that would Crank but would not start. Acting like no fire or fuel, towed it to the shop here is what all we have replaced.

Fuel pump has been replaced ( plugged the fuel pump into the harness to make sure it would come on prior to installing and it did ) Installed the pump in the tank hooked the battery back up pump came on the 2 seconds and shut off. Truck tried to fire once After that the pump will not come on at all here is a list of what has been done

New Fuel pump
Run the Ipdm test and not one but (2) modules pass the test (horn, wipers,fan, fog lights,headligts etc Not only 2 modules but 4 relays also
Crank Sensor New
( spray with staring fluid it will fire) Pump is not running
(3) different Keys tried
Anti Theft light blinks as normal

Something has the fuel pump shut down and will not allow it to run. Could this be the ECM ( Engine Computer )
Is there a way to test or reset the Anti Theft System

Thank you in advance

John
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post #362 of 368 (permalink) Old 10-25-2016, 10:23 AM
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Re: IPDM - ECU relay problems, symptoms and solution.

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Originally Posted by Kevkno View Post
Is this an intermittent problem or is your truck down hard? Are you using a scanner capable of checking communication between the different control modules (computers)?

I had an intermittent "Crank, No-Start" problem that took months to figure out. If it's down hard that should make it easier for troubleshoot. Using one of those capable scanners is important though since any breakdown in communication between any control module can keep the truck from starting.

The truck is Completely dead. As for the scanner I am trying to find someone that has one capable of looking at the communications between the ECM, IPDM however it works. Drove it home one night got in it to go the next morning to nothing but cranking with no start.
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post #363 of 368 (permalink) Old 10-25-2016, 01:16 PM
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Re: IPDM - ECU relay problems, symptoms and solution.

UPDATE !!!!! Truck will now Fire up then Die off. Runs about 2 seconds then it will shut back down. In the mean time it did throw a few codes. P0123 P0223 and P1121 This truck will be the will cause me to pull what little hair I do have left out!!! I never thought it would be so hard to find someone to come put an actual scanner on this truck when you are willing to pay!!!! I just love it!!!!!
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post #364 of 368 (permalink) Old 10-25-2016, 06:03 PM
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Re: IPDM - ECU relay problems, symptoms and solution.

Did you swap your fog light relay with the IPDM relay?


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post #365 of 368 (permalink) Old 10-26-2016, 07:18 PM
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Re: IPDM - ECU relay problems, symptoms and solution.

Tried 2 different ipdm modules placed new relays in both . Now the truck will crank and shut off throwing a P0123 and P0223 codes only acting like it has flooded..
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post #366 of 368 (permalink) Old 10-27-2016, 07:42 PM
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Re: IPDM - ECU relay problems, symptoms and solution.

Thank you for all of the suggestions on fixing the Titan It is back up and running however it was a nightmare!!! Final solution


Not 1 but 2 bad Delphi fuel pumps from Advance auto parts. The pumps would actually come on and run however they would not pump anything at all. They were garbage. The man at the parts store argued with me saying that there was no way 2 of them were bad. I had to show him a video of the Napa Fuel pump running and pumping fuel before he would admit he was wrong. That got the truck up and at least trying to run. Truck would crank and stumble like it was flooded. Long story short after 3 scanners were hooked to it none of the master techs was able to figure it out. It threw a P0123 and a p0223 code pointing at the Throttle body. Put a new Throttle body on it and the codes were still there. For some reason the codes were not being cleared from the computer it developed a memory of the codes but yet it would turn the Check engine light off when they were cleared. For kicks and giggles I disconnected both cables and held them together for about 10 mins hooked them back up and what do you know. The titan came back to life running like a dream IT fired right up

Original fuel pump died! Then after 2 Bad pumps and a computer holding a memory of 2 codes caused this truck no to start and run


Thanks again
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post #367 of 368 (permalink) Old 10-27-2016, 09:39 PM
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Re: IPDM - ECU relay problems, symptoms and solution.

Should always be removing the negative battery cable when preforming jobs that you are unhooking and plugging connectors back together. May have took care of your memory code problems.
At any rate glad to hear you got it running and sorry to hear of your troubles with trhe faulty pumps!

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Long TruCool added w/ removal of radiator in the loop
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post #368 of 368 (permalink) Old 12-22-2016, 03:23 PM
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Re: IPDM - ECU relay problems, symptoms and solution.

New kid on the block and not very mechanically savvy! My 2008 Titan Crew XE will crank til the cows come home. I can hear a 2 second hum at the fuel tank when key is turned, but no ignition. I tried swapping the relays as many of you recommended, no change, still just cranked with no firing. Tried spraying starter fluid into the air intake and no results. What do I check next? It has 169,000 miles on it and runs like a top when it runs, she just won't fire. It had slowly been getting more difficult to start. Now it is dead in my garage. Any help is appreciated. Make it simple. My business is the Bible, not motors.
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