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Old 08-17-2013, 03:02 PM   #1
Orphan22
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Default Bad Sensor Help!

So my car AT light came on, and after that it would not take reverse, and it shifted from 1st to 3rd and it would not take 4th. So we tough it was a bad solenoid, but it turned out to be a Sensor, a few :/
here are the codes.

P0012: Camshaft but it said it was retarded or something.

P2100: Throttle Control.

P0222: Throttle Position.

P0123 Code - Throttle Position Sensor.

P0102: Mass Air Flow

P0113: Intake Air Temperature Circuit High Input

Here is the deal, i need your help to determine which is causing the shift problem. I would like to replace them all, but just lost my job, and i would like to at least fix the shifting till i can find a job and fix all the other ones. My friend "erased" the codes or something and the car is working properly, but every now and then it turns AT light back and it does the same thing again, so i turn it off and back on and it goes away. HELP?
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Old 08-17-2013, 03:21 PM   #2
flatlander937
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What is the age/condition of the battery?

It sounds like a bad battery or poor connection with so many codes that have nothing to do with each other.

Start there, verify the battery is good, use a DVOM to check for voltage drop across all over your heavy gauge battery/alternator/starter/chassis ground cables.

edit: where are you located?
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Old 08-17-2013, 03:27 PM   #3
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Quote:
Originally Posted by flatlander937 View Post
What is the age/condition of the battery?

It sounds like a bad battery or poor connection with so many codes that have nothing to do with each other.

Start there, verify the battery is good, use a DVOM to check for voltage drop across all over your heavy gauge battery/alternator/starter/chassis ground cables.

edit: where are you located?
Ill start there, and in Puerto Rico bro :/
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Old 08-18-2013, 10:34 AM   #4
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Battery is ok. Any knowledge on what sensor could be causing the problem?
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Old 08-18-2013, 11:25 AM   #5
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Quote:
Originally Posted by Orphan22 View Post
Battery is ok. Any knowledge on what sensor could be causing the problem?
How did you test the battery? And how old is it? I've run across several "good" batteries that have caused problems just like yours. The cells can intermittently short out and throw tons of codes.


So your codes were all erased? Which ones exactly came back?
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Old 08-18-2013, 04:48 PM   #6
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I took it to advance auto parts and they checked it and it said it was goof 96%. And now it showed P0012 "A" Camshaft position- timing over retarded (bank one)
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Old 08-18-2013, 05:37 PM   #7
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Quote:
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I took it to advance auto parts and they checked it and it said it was goof 96%. And now it showed P0012 "A" Camshaft position- timing over retarded (bank one)
Check your VVT actuator solenoid connectors for oil leaks(pull the connectors off and look at the pins). Check engine oil level and position. If those seem OK then you need to check the wiring going to the actuator... could be the actuator itself or could be messed up timing-wise(stretched chain, worn tensioner, etc).
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Old 08-18-2013, 05:51 PM   #8
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where is the VVT actuator solenoid located?
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Old 08-18-2013, 10:24 PM   #9
mazda3 2429
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Check the wires going to the mass air flow sensor.
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Old 08-18-2013, 10:39 PM   #10
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Gah Mazda VVT is different than nearly every other VVT setup I'm used to... GM VVT solenoids bolt right into the cylinder head on the Ecotec motors and are a 3 minute job.

Looks like the VVT actuator is basically bolted to the end of the camshaft and holds the cam sprocket... this is what is possibly sticking and requires dicking with the timing which can suck.

The code can also be set for a bad camshaft position sensor... which is located just to the right of the last coil pack on the end of the valve cover. I would check it for oil leaking or anything physically wrong with it.

Unfortunately without being able to look at the commanded and actual valve timing readings with a scan tool, at this point there isn't a whole lot more to do aside from guess from behind a keyboard.


Search the forums for other posts w/ "P0012" and you'll find a bunch, and you'll find about how much of a PITA is could be.
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