DTC P1512 - VARIABLE TUMBLE CONTROL SYSTEM (VTCS), STUCK CLOSED
The air intake hose that goes from the air filter/mass airflow sensor to the throttle body they are common to crack. This air leak can cause a lean condition if that checks out ok then the issue is usually a faulty mass air flow sensor .This would need to be checked next.
Usually the actuator valve is stuck closed. These are the most common causes of the P1512 and possible causes are:
* ECT sensor malfunction.
*
MAF sensor malfunction.
* IAT sensor malfunction.
* EGR boost sensor
malfunction
* TP sensor malfunction.
* CKP sensor malfunction
* VTCS
solenoid valve malfunction.
* VTCS shutter valve stuck closed.
* VTCS
shutter valve actuator stuck closed.
* Short circuit between PCM and
VCTS solenoid valve.
* PCM malfunction.
I would start with the mass air
flow sensor this can cause all these issues. Then the cat. This would be
the next step.
I hope this helped (remember to rate and comment this answer).
Percent? Hard to answer. Its the same device with other name. The VTCS / IMRC is located under the intake manifold. To
get to or replace requires removing the intake. testing of the VTCS is
done with scanner or you remove intake and inspect that way.
In most cases you have a bad VTCS or the rod arm is stuck. the PCM is normally not the cause but.. can be. It woudl require scanner dats to confirm PCM problem. I am leaning to the VTCS form past jobs we have done where the solenoid has failed. The second most common is the door it controls is stuck a little. It still requires getting the manifold off to inspect the rod movement.
VARIABLE TUMBLE CONTROL SYSTEM (VTCS) [CALIFORNIA EMISSION REGULATION APPLICABLE MODELS ONLY] [FS]
The PCM turns the variable tumble control solenoid valve ON to close the crescent shaped shutter valve in the intake manifold when all of the following conditions have been met:
ECT is below 65°C (149°F).
Engine speed is below 3,000 rpm.
Throttle opening angle is below preset value.
ECT sensor and TP sensor are not malfunctioning.
The PCM turns the VTCS solenoid valve OFF to maintain startability and stability during engine cranking and for 0.15 second after engine is started.
Sorry, CAT its same catalyzer.
ECT = Engine Coolant Temperature sensor
IAT =Intake Air Temperature sensor
This and other details could find in Car-Term-Abbreviation-Definition
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Thanks, for your tips but I got crazy with all your suggestions, you have suggested almost all of the intake sensors. P1512 error code for this model car, 00 MPV and the rest of the 2.5 Ford engines used by contour, cougar and etc. have 80% percent failure rate for it's IMRC. This module works too hard for this car because of the heavier body with small engine. The car runs at high RPM even at 65mi/hr. Not a good design from ford.
Why would you check the CAT?
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SOURCE: mazda mpv 2000
Possible problem is carbon build up in intake runners..remove top intake and clean runners..
SOURCE: p1512 fault code on mazda
I had the same problem and it happened at high speed on an Interstate Mountain (Hwy 5 from Kelowna to Meritt).... so scared but car ran fine all the way.... so hope it goes away.... I had the check engine light removed and hope it does not reappear
SOURCE: I am getting a P0031, P1512, & P0421 code
P0031 - most likely pointing to a failed O2 sensor (bank 1 sensor 1 is located before the catalytic converter)
P0421 - failed catalytic converter or a failed O2 sensor
P1512 - intake manifold shutter valve is stuck - may be caused by the O2 sensor, but may not
I recommend replacing your O2 sensor first and see what happens
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My vehicle has IMRC ((Intake Manifold Runner Control, 00 MPV), its a ford engine, is it the same as VTCS unit you have just mentioned? How much percentage that this IMRC unit will fail in your years of experience?
sir what do you mean by "cat" wrote in your possible solution below?
I'm not well familiar with some automotive terms, what do you mean by, ECT and IAT? Thanks in advance, I will start working in my car this weekend. Thanks in advance for your help.
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