Mazda Protege DTC P0505

2 Jan 2015 | Author: | Comments Off on Mazda Protege DTC P0505
Mazda Protege

Questions and Answers

Mazda DTC P0505

Q. Hi Vincent, I have a Mazda Protege LX, manual and 77,500 miles. The Check Light came on a few days so we took it to a nearby Firestone. told me:

The DTC is P0505 – Control System Malfunction.

expensive to fix, so instead recommended various other spark plugs, ignition distributor cap, fuel is what I remember. For good they suggested I get a new set of tires,

If the above recommended maintenance fix the problem, I’d need to get a new control speed valve.

grilling the guy at the desk, they downloaded the code and did no more that at all, so no verification of circuits, etc. to make system was put together as it should be. to say, I hightailed it out of there, $90.00 for their diagnosis but not to go back for any of their recommendations.

So, my

The light is out; does mean that the computer is erased, and therefore I cannot it to get a second opinion?

If the light is out and does not come on, does that mean it was a problem that does not immediate/any attention?

Is there a cleaning/tune up to try, like intake manifolds, before the idle speed control

Thank you so much for your

A. You are a very smart lady I would not have walked out of I would have run out. It is obvious he was more interested in work then addressing problem.

Let that $90.00 be the last you ever give them. It like a Firestone Dealer I to work for in New Jersey.

The owner was as as an oak tree. I saw him sell $1200.00 of front end work to a brand new Continental with only miles.

Anyway, to answer questions, if they erased the then it is gone unless the Control Module (PCM) has the malfunction again. If the Check Light (MIL) has not come on since then, I wouldn’t about it too much.

Mazda Protege

If they didn’t erase the then, even though the MIL is the code will still be If the MIL hasn’t come back on, the is not present.

P0505 can be caused by a of things, none of which be repaired by replacing the tires. is a little information on DTC P0505.

The air intake system is composed of the air duct, air filter housing and the air tube, the big black tube from the air filter housing to the manifold.

Check the air intake and make sure it is attached and firmly. Inspect the air intake for cracks or tears, especially in the Then check all the vacuum to be sure they are attached and in shape.

Make sure the to the Idle Air Control Valve is on and locked. Check the terminals to sure they are clean and not

There is a maintenance you can do on the throttle and IACV. Read my article Throttle Bodies on what and how to do it.

Information provided courtesy of

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