2004 mazda tribute. Recently replaced several components since the vehicle has not ran for about 2 years. All 4 o2 sensors, rear twc converter, spark plugs, upper intake manifold seals, cleaned out upper intake manifold and egr tube extensively, egr valve, vacuum control solenoid, differential feedback pressure sensor, and pcm has been replaced. Problem that I'm having is that this code keeps setting, not upon initial startup after clearing code, but after shutting off car then restarting right after. I've checked that vacuum solenoid is getting battery voltage when key on engine off and when engine is running and dfps is getting 5 volts both signal and reference at the connector. Car run pretty well but gas mileage isn't the best and it has a very slight hesitation at light throttle application. My next guess is a wiring issue from the vacuum control solenoid to the pcm but I'm not able to find detailed wiring diagrams as of yet. I would greatly appreciate any help here. I've researched many websites and haven't been able to find any helpful info

 

Welcome to the forum.

Yes, you did what most DIY often do which is replace parts randomly without first testing that they are bad.

Also the reason your DTC returns as you described is because you Monitors are not in state of readiness so after a cycle or 2 any problem that was not resolved will activate the dash check engine light.
Now you need to start over and do the proper diagnostic tree of problem solving as if you were an experienced *Automotive Diagnostic Technician or take it to a shop that *has one and at least pay to have them tell you what the problem is and what actual part if any need to be replaced.


ASE

 

Thank you for the useful info and not answering my question. That's not what I needed to hear because I have done extensive testing and trying to isolate the problem. It's an electrical issue and I need a wiring diagram for the egr solenoid circuit

 

auh ok then.....
Hate to say it but it does not read that way from what you posted in the first response.
Well as you seem to know where to look???? I recommend that you pay a month subscription to ALLDATA and then not only can you get an electrical diagram, but you can also download every bit of service information about your MAZDA!

 

Uh yeah I know about motor all data but I don't have a computer and it's difficult for me to do all of this on my phone. I don't want to pay more money for something i dont use often enough. I was hoping that someone maybe had a wiring diagram of this particular circuit as I have learned it is a common issue for these vehicles. I'm not in a hurry to figure this out as it is not my daily driver

 

......

 

Problem is fixed. The two wire connector to the vacuum control solenoid was the culprit. What threw me off was that it was getting battery voltage between 12.5 and 13.5 ish constantly, even while driving as the multimeter doesn't lie. And I knew the solenoid was good because I tested it with jumper wires straight from the battery. Based on my research from other people with these issues, that seems to be a common issue with these vehicles. Lesson learned connectors can go bad even though the wiring is good because the pins in the terminal can wear out internally and you can't visually see the problem. Hopefully this helps others with their problems with that pesky p0403 code

 

I think it is kind of sad that you don't seem to be able to purchase just a manual and wiring diagrams, at least for Tributes. I also don't want to pay monthly for something only needed occasionally. I guess that helps to defeat DIY.

I also understand what Callisto said about parts replacers rather than using a step by step method to detect the problem. Unfortunately, there are many dealer techs that seem to do that as well, at least there was a long time ago; I used to be a technician and import distributor tech who often traveled to dealers to help resolve issues, also answered calls from dealer techs on how to diagnose.

 

Nice work finding the problem.
Connector's that are not exposed to moisture will last decades. However, when disconnecting any electrical connector on a vehicle a little dielectric grease can prevent many head aches in the future.
I causally looked and found one of several service manuals that could be downloaded, most for a small fee.
A real currently certified ASE Technician or mechanic would and should not randomly replace unconfirmed parts. If they are the shop should replace that employee as they are not a very good Technician and not sure how they ever passed the test? I can also reference a Mechanic's training school that actually state to test all suspected parts before replacing them That publication was from International Correspondence School, Canton Pennsylvania 1950. A another would be in, and this was primarily for employees working in retail auto parts stores specifically used in many change store auto parts stores like Chief Auto Parts with over 500 retail auto outlets Auto Repair Illustrated Deluke Edition 1983. The ASE Testing and the pretest as well study guide all state to test parts before replacing and that has been that way since the 1980's and as I have tested every 2 years since the 80's and currently still certified I can tell you it is on some of the pretest questions about proper technique in diagnostic problem solving.
I could even go so far to state that in getting my avionic certification some testing procedure for systems and part were to be done while in the circuit and not to be remove at all before testing them. Some even state you must log if you remove a part for testing and to report the findings of the test before reinstalling it and then must get that part signed off by another technician.
Why would a so-called experienced technician come to a basically DIY forum and start a thread with a basic question about a diagnostic trouble code? makes you go hmmmmm?
As for a manual I causally looked and by golley gee they are available here is just one source of a few I found???
Mazda Tribute Workshop Manual 2001 - 2007 GF Free Factory Service Manual (allcarmanuals.com)


Well in the end it is always good to read when a member having a problem reports back their resolve and how they did it!

 

import distributor tech this sounds more like in house employee designation. I once held a title of Parts Technician thought it was funny, but it is an actual testing program and was required at one place I worked for a period of time. The pretesting class they asked me to teach but I still myself had to test at some point to get that certification. LOL
The term DIY (do it yourself) has been many a problem in so many subject matters because of all the internet information. Everyone now thinks they can do what some actually get a schooled and training for? But hey if it were not for DIY or service shop would have about 15-20% less customers that tried and failed to service their own vehicle even with a service manual and failed making the problems worse. lol
The DIY world is so bad that on some services now that we do like brake jobs the vehicle is first inspected to see if there was resent work done. I can't tell you how many stripped fasteners or broken parts that DIY cause and then bring their vehicle to the shop and when asked always to say IDK how that happened? But I know if we did not spot those frick-ups the customer would claim we did it. LOL