'05 Scion tC P0012

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6 months 1 week ago #201422 by brianb83
'05 Scion tC P0012 was created by brianb83
So I have an '05 Scion tC that started having problems recently. Bought a scanner since I needed one, and found way more codes than I expected. I suspect there's one, maybe 2 issues that are causing them all. Anyways, it was running fine, then it stalled on me at a stop sign. Started back up, but was immediately running rough. Fluctuating idle, wanting to stall. Drove it into a parking lot in front of the comms shop here on base, and parked it. Again it started, then I drove it back to my parking structure and right as I'm pulling in my space, it dies. Didn't try starting it. Side note, it has an oil leak. The shop said it was from the timing chain cover but I haven't double checked it to verify that. Here are the codes.

P0455, P0012, P0441, P0300, P0301, P0302, P0303, P0304, P0016.

This isn't caused by my timing chain or anything is it? From what I can tell and what I've been reading, it could the the oil screen, OCV, or VVTi solenoid. Any suggestions?

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6 months 1 week ago - 6 months 1 week ago #201423 by nightflyr
Replied by nightflyr on topic '05 Scion tC P0012
P0455
Possible causes :
Missing or loose fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
EVAP canister or fuel tank leaks
EVAP system hose leaking Fuel tank leaking

This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed. OBDII Code P0455 Scion - EVAP System Gross Leak Detected -



P0441
Possible causes:
Missing Fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Purge VSV Connector/wire harness(purge VSV -ECM) ECM
Canister pump module
Leakage from EVAP system


P0012
Scion Description The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle. As a result of the angle change, the engine timing is advance or retard. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.

Possible causes:
Low or Dirty Engine Oil
Faulty variable valve timing (VVT)
Faulty oil control valve (OCV)
Variable Valve Timing (VVT) harness is open or shorted
Oil Control Valve (OCV) harness circuit is open or shorted Damaged ECM

The remaining codes are cylinder misfires
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Last edit: 6 months 1 week ago by nightflyr.
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6 months 1 week ago #201425 by cj1
Replied by cj1 on topic '05 Scion tC P0012
Disconnect the VVTi solenoid.,
Does it run ok at idle?

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6 months 1 week ago #201458 by brianb83
Replied by brianb83 on topic '05 Scion tC P0012
Thanks for the info! I'm gonna check the OCV to see if it has a hand in this

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6 months 1 week ago #201459 by brianb83
Replied by brianb83 on topic '05 Scion tC P0012
Where's the VVTi Solenoid located at?

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6 months 1 week ago #201461 by nightflyr
Replied by nightflyr on topic '05 Scion tC P0012
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6 months 1 week ago #201508 by brianb83
Replied by brianb83 on topic '05 Scion tC P0012
I'm pretty dumb when it comes to this stuff sometimes, but I'm too cheap (broke) to pay a mechanic to do it, so I've gotta do it myself.

www.autocodes.com/p0016_scion.html

This is telling me the P0016 code causes my timing to retard. Is it safe to assume that's causing the P0012 code as well, along with all the misfire codes? It seems logical to me, but I'm also barely an amateur mechanic. Also, when I get the chance to check my vehicle out this weekend, what's this OCV look like from the outside? How difficult is it to get to?
I'm *technically* not supposed to work on vehicles in the parking lot/structure here on base, but honestly if I can get it done quick enough I could justify it. If not, I have to attempt to start it and keep it from dying long enough to drive the roughly 2 miles to the auto hobby center on base.

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6 months 1 week ago #201509 by brianb83
Replied by brianb83 on topic '05 Scion tC P0012
Also, I have an oil leak. I attempted to use some additive to the oil that claimed to seal it up. When I poured it in, I noticed the viscosity of the fluid was kinda thick but the drip of it was almost like melted rubber. Maybe that's the wrong way to describe it, but if you've attempted to use an oil leak sealer I'm sure you know what I'm talking about. What's the likelihood of this sealer messing up/clogging either the OCV or the oil screen for the valve on my car?

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6 months 1 week ago #201514 by nightflyr
Replied by nightflyr on topic '05 Scion tC P0012
These should help:


You might also look at this:



This is telling me the P0016 code causes my timing to retard. Is it safe to assume that's causing the P0012 code as well, along with all the misfire codes?
It's possible but never assume, that could be a costly error.

Also, I have an oil leak. I attempted to use some additive to the oil that claimed to seal it up. When I poured it in, I noticed the viscosity of the fluid was kinda thick but the drip of it was almost like melted rubber. Maybe that's the wrong way to describe it, but if you've attempted to use an oil leak sealer I'm sure you know what I'm talking about. What's the likelihood of this sealer messing up/clogging either the OCV or the oil screen for the valve on my car?
Engine repair mechanic in a can is more often than not more trouble and grief than properly repairing the original issue.
That being said, there is a very good possibility that may have caused your trouble.
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