Guests - If You want access to member only forums on HSO. You will gain access only when you Sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

  • Announcements

    • Rick

      Members Only Fluid Forum View   08/08/2017

      Fluid forum view allows members only to get right to the meat of this community; the topics. You can toggle between your preferred forum view just below to the left on the main forum entrance. You will see three icons. Try them out and see what you prefer.   Fluid view allows you, if you are a signed up member, to see the newest topic posts in either all forums (select none or all) or in just your favorite forums (select the ones you want to see when you come to Fishing Minnesota). It keeps and in real time with respect to Topic posts and lets YOU SELECT YOUR FAVORITE FORUMS. It can make things fun and easy. This is especially true for less experienced visitors raised on social media. If you, as a members want more specific topics, you can even select a single forum to view. Let us take a look at fluid view in action. We will then break it down and explain how it works in more detail.   The video shows the topic list and the forum filter box. As you can see, it is easy to change the topic list by changing the selected forums. This view replaces the traditional list of categories and forums.   Of course, members only can change the view to better suit your way of browsing.   You will notice a “grid” option. We have moved the grid forum theme setting into the main forum settings. This makes it an option for members only to choose. This screenshot also shows the removal of the forum breadcrumb in fluid view mode. Fluid view remembers your last forum selection so you don’t lose your place when you go back to the listing. The benefit of this feature is easy to see. It removes a potential barrier of entry for members only. It puts the spotlight on topics themselves, and not the hierarchical forum structure. You as a member will enjoy viewing many forums at once and switching between them without leaving the page. We hope that fluid view, the new functionality is an asset that you enjoy .
Sign in to follow this  
Jeremy airjer W

Seeing the whole picture, diagnosing a no start!

Recommended Posts

The other night a Nissan Maxima came in on the hook. It would crank over fine but would not start. Most techs would start with the gut feeling, as I did. I couldn't hear the fuel pump running while I cranked it over and I never smelled the odor of gas. This led me to believe that there was a fuel issue. The first step was to see if there was fuel pressure and there wasn't. Next step is there power to the pump? The pump is accessible under the rear seat which made it easy to check. The black with yellow wire supplies power to the pump and much to my surprise there was no power!

mazdapump.jpg

So the next step was to check the fuse which had power to it. I decided that I needed to check the fuel pump relay which was located behind the ABS module that was behind the left front kick panel. The PCM grounds the relay which energizes the solenoid that closes the circuit that allows power to go to the pump. The PCM was not doing its job?

I decided to hook up the scan tool to see if there was any data that might be helpful. The scantool would not communicate with the PCM? What is going on?

Then it dawns on me, theres no check engine light when I turn on the key or crank the vehicle over.

mazdanolight.jpg

Now I start to see the whole picture. The problem isn't just the fuel system its all the systems! So now I need to find out if its the PCM that has failed.

I run through the diagrams and find all the power and grounds that I need to check. They all check out except for a white with blue wire that feeds the PCM and ECS relay. It starts in the underhood fuse block, then goes to the underhood #1 relay box where it splices into three wires, it then runs back to the underhood #2 relay box and the PCM after it splices off into three more wires somewhere in the harness that runs between the two relay boxes.

I start by checking the fuse block to make sure theres no corrosion or open wiring. It was fine.

mazdafb1.jpg

I then double check the ECS relay for power on the white with blue wire. No Power!

mazdarb2.jpg

Then I tear apart the #1 relay box to find the first splice. I had power on all three wires coming out of the splice so it was good. the middle wire (red arrow) was the power feed from the fuse the one to the right (yellow arrow) was the feed to the splice in the harness. I'll get to the yellow arrow in a second.

mazdasplice.jpg

I decided I needed to find the splice in the harness. The yellow arrow is the power supply wire to the relay box splice. The red arrow is the feed to the PCM and ECS relay. I had continuity from the relay to the spot where the arrow is pointing but no continuity from the arrow to the relay box splice so I knew the problem was in the hardest to get at last foot of harness.

mazdaharness.jpg

Sure enough just outside of the relay box was the white with blue wire that had completely corroded through (yellow arrow).

mazdasplice.jpg

Close up of the culprit

mazdaproblem.jpg

And the repair

mazdarepair.jpg

The first thing I did was turn the key on and there was the check engine light.

Mazdalight.jpg

A couple of cranks and the engine started!

Even though my gut instinct was theoretically correct, taking a second to see the whole picture made this diagnoses a little easier!

Share this post


Link to post
Share on other sites

Very cool Jer!

Pretty nice of you to take the time to do this. Time is money wink

Share this post


Link to post
Share on other sites

Ah the wonderfull life of wire chasing! Thanks Airjer, some of these posts you spend time to create for us shows others how hard our jobs can be, and its not just hook up the computer and the computer tells us what is wrong!

Thanks for taking the time to post these steps for everyone!

By the way, while you are working on these cars and taking pictures, does you co-workers or boss wonder what you are doing?

Share this post


Link to post
Share on other sites

By the way, while you are working on these cars and taking pictures, does you co-workers or boss wonder what you are doing?

Everybody I work with is really supportive of the things I do! Mike (one of our service managers) reminds all the time to take pictures!!

Share this post


Link to post
Share on other sites

"Even though my gut instinct was theoretically correct, taking a second to see the whole picture made this diagnoses a little easier!"

Taking a second??? C'mon, you were on your thirds, fourths and fifths here.

Share this post


Link to post
Share on other sites

You lost me pretty quick on this one, some fixes are worth every penny. smile It usually is the piece that is hard to get at, makes you wonder what mechanics think of engineers.

Share this post


Link to post
Share on other sites

We think alot of engineers. They have made me laugh, swear, cry, scream, and just plain shake my head with confusion on why! I am sure their are more, but those are the most comon things!

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  



  • Posts

    • It is really beautiful! Awesome pics.
    • slice, grill, garlic,salt pepper, eat. 
    • Who's "They"???
    • Now you are catching on! BTW, if you haven't heard, they finally figured out that eating cholesterol in food doesn't raise blood cholesterol. 
    • Juneau4  won with 353 for 6th win of season 2--BlackLudProV        343 3--Swiveldigger           299 4--huckfin                   279 5--88fan                     266 6--Catzman               259 7--fishingstar            237 8--Henry's Heroes    231 9--Musky999             230 10-jar jar                    227 11-mnwildman         211 12-gregg52               120 -------------------------------------------------------------------------------------------------------------- FINAL LUCKY DOG STANDINGS 1--Juneau4                     9634 2--mnwildman               9412 3--Swiveldigger              9402 4--Catzman                     9389 5--huckfin                        9328 6--fishingstar                   9216 7--Musky999                   9134 8--BlackLundProV           9071 9--88fan                            9052 10-Henry's Heroes          8994 11-jar jar                           8898 12-gregg52                      8788 --------------------------------------------------------------------------------------------------------------------- NO LUCKY DOG STANDINGS 1--Juneau4                          10216 2--Swiveldigger                   9981 3--Catzman                         9864 4--mnwildman                    9797* 5--fishingstar                      9772 6--huckfin                            9726* 7--Musky999                       9614 8--BlackLundProV              9592 9--88fan                                9479 10-Henry"s Heroes              9455 11-jar jar                               9266* 12-gregg52                           9093* *    These competitors were not entered the first week.  I only put  the NO LUCKY DOG SCORES  up so you could see how they would compare. ------------------------------------------------------------------------------------------------------------------------------- Week high scores   Both were at Dover week 29 1--  huckfin            388 2--BlackLundProV    383 LOWEST WEEKLY WINNING SCORES Swiveldigger and Juneau4               200       Daytona     week 1  ----------------------------------------------------------------------------------------------------- Most wins for year Swiveldigger    6 Juneauu4         6          They both had the lowest winning scores though too! ----------------------------------------------------------------------------- Those of you that played the game --Thankyou I can only say as the CHAMPION it was more Luck than Brains! Next year if I set it up again I wish to have those who participate to say whether Lucky Dog or not -Have a good winter and Happy Holidays to all.           
    • Bag 'em up and souse 'em!!!  
    • Great! To all the Coyotes and Wolves up in our hunting area.  I hope they all waste away!
    • The only problem we have had with the kdrill is today we had ice build up between the center point cutter and the first tooth on the chipper blades. Once I cleaned that out it drilled like day one. Don’t need any other auger. 
    • How much ice do you need to feel comfortable putting your perm shack out there? I have a 4x6 made from 2x4s and thick plywood. Its on the heavier side. Im thinking 7-8 inches.
    • All that smoke and spice to try and make pork belly edible. 
  • Our Sponsors