2002 Mazda Tribute vehicle brain/ control system

Tiny
BETTNGRL
  • MEMBER
  • 2002 MAZDA TRIBUTE
  • 3.0L
  • V6
  • FWD
  • AUTOMATIC
  • 179 MILES
I believe the brain is faulty because of the alternator, I have another brain with the same matching numbers but when I plug it in it does not start the car. This is also the third brain I have tried making me think that before you can use another brain maybe I need to erase the codes from the original brain?
Do you
have the same problem?
Yes
No
Tuesday, June 17th, 2014 AT 4:08 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
What is the symptom? Diagnostic fault codes are stored in the Engine Computer, so if you unplug it to replace it, that loss of power erases the codes in it. Any replacement computer won't have any codes in it until you turn on the ignition switch and a problem is detected.

There isn't much you can do to damage an Engine Computer. To go through three of them suggests there's some other cause for the symptoms. What exactly is happening now?
Was this
answer
helpful?
Yes
No
Tuesday, June 17th, 2014 AT 11:28 PM
Tiny
BETTNGRL
  • MEMBER
The original brain will start my car but there is no power what so ever I had hooked up the OBD 11 to it and it says there are no codes then I drove it for a couple of blocks then when I parked it I put the OBD back on it and it still says there are no codes but the coolant light is on so I know something is going on and the loss of all power something is really going on but it doesn't read it. The alternator I had was putting out to much electric and it blew up the battery in my car when I had it replaced the guy took out the brain and said he cleaned it cause there was all kinds of dirt in it so I figured he must have messed up the brain cause your not suppose to touch the inside little wires. I put the new brain in and it will not even start the car. I did unplug the negative side of the battery before I put the brain in so I am at a loss to why no other matching numbered brain wont start the vehicle and why it is running so bad?
Was this
answer
helpful?
Yes
No
Wednesday, June 18th, 2014 AT 2:39 PM
Tiny
CARADIODOC
  • EXPERT
When you have a coolant light on the dash, that's for the level in the reservoir. That doesn't have anything to do with the systems monitored by the Engine Computer so there is no fault code related to that.

I'm not sure what your mechanic cleaned, but I've taken a lot of computers apart to install defects that I can switch in and out for my students to practice troubleshooting. The circuit boards are sealed really well because of the environment they live in. They can take some rough handling without any problem unless there is already a corroded spot that is about to act up.

There's a couple of things you might consider. First of all, there is a possibility your replacement Engine Computer will not work until it has your vehicle ID number programmed into it. General Motors is one of the world's leading manufacturers when it comes to innovations that benefit them and cost their customers lots of money. To my knowledge they were the first manufacturer to pull that stunt starting with some 2002 models. While I hadn't heard of that with any other manufacturers that far back, it is possible that applies to your vehicle.

The next thing that comes to mind is if your coolant light came on due to low level in the reservoir, where did it go? Unless you see evidence of a leak, the most likely suspect is a leaking cylinder head gasket. Depending on where the leak is and how bad it is, that can cause poor performance, overheating, a misfire, and / or white smoke from the tail pipe. There's two good tests for that. One is to add a small bottle dark purple dye to the coolant, then search a day or two later with a black light. The dye will show up as a bright yellow stain. If the head gasket is leaking, you'll find that stain inside the tail pipe. The second test involves drawing air from the radiator, while the engine is running, through a glass cylinder with two chambers partially-filled with a special dark blue liquid. If combustion gases are present, the liquid will turn bright yellow.
Was this
answer
helpful?
Yes
No
Wednesday, June 18th, 2014 AT 10:30 PM

Please login or register to post a reply.

Recommended Guides