Po1349 Vvt Actuator Code + Cause... Must Read

ouroboros

New member
Well, I did a little DD on the VVT actuator and this particular service code and it turns out Toyota has 2 service bulletins out that are related to it.

First one is with regards to the valve cover baffle being deformed by creton oil changers shoving heavy oil guns into the oil filler opening. This can damage the camshaft angle sensor and trip the PO1349 code as its tied into the ECM and VVT operation.

TSB EG 007-02

Second one is the actual VVT actuator itself and how the tech can do an active test on it to determine if the actual component is faulty. IMPORTANT, for DIYers it also includes a diagrammed tip on how to properly install and index the new VVT actuator for proper function.

TSB EG 009-03

My problem turns out to be the actuator. Curiously enough, I shopped around for a cheap price but when you factor in shipping and other charges it all comes out the same. Toyota does not have an active market for VVT actuators like Honda... probably because Honda's VTEC system is preferred by mod-ers and is licenced for use to other makers like Nissan.

Contrary to popular believe, noise isn't a reliable indicator of VVT malfunction. My engine isn't overly noisy, only chatters somewhat on start-up, and doesn't make too much valve train noise when up and going... but the PO1349 code still comes on and there's nothing wrong with the camshaft or the CPS. Took the valve cover off and checked. Yet I'm down 25% on mileage since this problem started... so another myth broken; your VVT system malfunction will not affect mileage. WRONG... its tied into the ECM and any problems going into that unit will affect mileage. Seems to be a slow progression though since I didn't notice any mileage difference in October 05 when the light first came on. Now its noticeable and I'm not getting any other check lights.

Heads up,

 

friendly_jacek

New member
Well, I did a little DD on the VVT actuator and this particular service code and it turns out Toyota has 2 service bulletins out that are related to it.
First one is with regards to the valve cover baffle being deformed by creton oil changers shoving heavy oil guns into the oil filler opening. This can damage the camshaft angle sensor and trip the PO1349 code as its tied into the ECM and VVT operation.

TSB EG 007-02

Second one is the actual VVT actuator itself and how the tech can do an active test on it to determine if the actual component is faulty. IMPORTANT, for DIYers it also includes a diagrammed tip on how to properly install and index the new VVT actuator for proper function.

TSB EG 009-03

My problem turns out to be the actuator. Curiously enough, I shopped around for a cheap price but when you factor in shipping and other charges it all comes out the same. Toyota does not have an active market for VVT actuators like Honda... probably because Honda's VTEC system is preferred by mod-ers and is licenced for use to other makers like Nissan.

Contrary to popular believe, noise isn't a reliable indicator of VVT malfunction. My engine isn't overly noisy, only chatters somewhat on start-up, and doesn't make too much valve train noise when up and going... but the PO1349 code still comes on and there's nothing wrong with the camshaft or the CPS. Took the valve cover off and checked. Yet I'm down 25% on mileage since this problem started... so another myth broken; your VVT system malfunction will not affect mileage. WRONG... its tied into the ECM and any problems going into that unit will affect mileage. Seems to be a slow progression though since I didn't notice any mileage difference in October 05 when the light first came on. Now its noticeable and I'm not getting any other check lights.

Heads up,
Interesting. What year and miles?

So, you are saying that it broke suddenly or is warn out?

 

fishexpo101

I know Karate, Kung Fu, and 47 other dangerous wor
Good links on the TSB - thanks for posting them.

I've heard of problems with the bent/deformed baffles for some time from Celica owners - doesn't seem to be many from the Corolla, Matrix guys do to better information out there.

There was a poster here in the past that had similar issues with the VVT actuator (I think it was bwringer). Also some info on oil related issues with the VVT system (reason why I use synthetics exclusively, still looking for details on that report thought) - might also want to take at the little filter for the system to see what it looks like. Yotarepair site has some info on the actuator as well:

http://yotarepair.com/whatshot.html

 

ouroboros

New member
Good links on the TSB - thanks for posting them.
I've heard of problems with the bent/deformed baffles for some time from Celica owners - doesn't seem to be many from the Corolla, Matrix guys do to better information out there.

There was a poster here in the past that had similar issues with the VVT actuator (I think it was bwringer). Also some info on oil related issues with the VVT system (reason why I use synthetics exclusively, still looking for details on that report thought) - might also want to take at the little filter for the system to see what it looks like. Yotarepair site has some info on the actuator as well:

http://yotarepair.com/whatshot.html
http://www.billzilla.org/vvtvtec.htm

Here's a like to an Aussie site comparing Toyota's VVT system to Honda's VTEC. There's a diagram about half way down that shows the major components in the VVT system (camshaft position sensor, ECM, oil solenoid) and the flow of data. Its always good to know what your looking at when going to the dealer.

 

fishexpo101

I know Karate, Kung Fu, and 47 other dangerous wor
[http://www.billzilla.org/vvtvtec.htm
Here's a like to an Aussie site comparing Toyota's VVT system to Honda's VTEC. There's a diagram about half way down that shows the major components in the VVT system (camshaft position sensor, ECM, oil solenoid) and the flow of data. Its always good to know what your looking at when going to the dealer.
Another great link - Bill Sherwood is a great resource for performance twin cam (ie. 4AGE).

 

ouroboros

New member
ouroboros,was there a change in drivability, like the VVT was stuck in one of the extreme positions?
Just got the Rolla back from the shop. They installed the new actuator and it seems to be running much better now. To answer your question yes, the VVT actuator was stuck in the low RPM position (minimum advance). There were no issues with rough idling but acceleration was really rough and anything over 2400 rpm seemed to be much rougher than usual. I'm guessing this could correspond to a 5 degree advance on the intake cam. Now its much smoother across the powerband. I have a feeling that my fuel economy will be restored as well cause the VVTi-equipped 1ZZ-FE engines are mapped differently than the earlier ones without VVTi. From what the mechanic says, the VVTi system on current Toyotas was designed first and foremost, to improve fuel economy... then driveability (low end torque). So the ECM is intimately tied into the VVTi feature and a malfunction will "eventually" result in lost mileage.

Big $$$ though. I needed the car in a hurry and didn't have time to do the DD so I paid the price. 210 CDN for the actuator + $320 for labor. Hope it lasts another 200 000 kms before it needs to be looked at again!

 

Bikeman982

Bikeman982
Good links on the TSB - thanks for posting them.
I've heard of problems with the bent/deformed baffles for some time from Celica owners - doesn't seem to be many from the Corolla, Matrix guys do to better information out there.

There was a poster here in the past that had similar issues with the VVT actuator (I think it was bwringer). Also some info on oil related issues with the VVT system (reason why I use synthetics exclusively, still looking for details on that report thought) - might also want to take at the little filter for the system to see what it looks like. Yotarepair site has some info on the actuator as well:

http://yotarepair.com/whatshot.html
Interesting information and includes picture.

 

ouroboros

New member
Just put my first tank through the Rolla with the new VVTi actuator.

Before repair mileage was calculated @ 7.2 L/ 100 km (combined)

After repair mileage (first tank) was 5.7 L/ 100 km (combined)

Much happier with the mileage now... it was well worth the cost of the repair to get this engine back to lean burning status.

 

friendly_jacek

New member
Just put my first tank through the Rolla with the new VVTi actuator.
Before repair mileage was calculated @ 7.2 L/ 100 km (combined)

After repair mileage (first tank) was 5.7 L/ 100 km (combined)

Much happier with the mileage now... it was well worth the cost of the repair to get this engine back to lean burning status.
Gee, I get more than 7L/100km since new (now 30000 miles). Maybe I should check if the VVTi is working at all! I get enought power and nice torque at low RPM, but the engine is very noisy on hard acceleration. Sometimes it sounds like diesel.

 

ouroboros

New member
Just put my first tank through the Rolla with the new VVTi actuator.

Before repair mileage was calculated @ 7.2 L/ 100 km (combined)

After repair mileage (first tank) was 5.7 L/ 100 km (combined)

Much happier with the mileage now... it was well worth the cost of the repair to get this engine back to lean burning status.
Gee, I get more than 7L/100km since new (now 30000 miles). Maybe I should check if the VVTi is working at all! I get enought power and nice torque at low RPM, but the engine is very noisy on hard acceleration. Sometimes it sounds like diesel.
I got crappy mileage during break in as well. This corresponded to about 40 000 km. Another possibility could be a dirty throttle body which could arise if the oil level was overfilled and blow-by has driven debris from the crankcase through the PCV and into the throttle body.

 

friendly_jacek

New member
Just put my first tank through the Rolla with the new VVTi actuator.

Before repair mileage was calculated @ 7.2 L/ 100 km (combined)

After repair mileage (first tank) was 5.7 L/ 100 km (combined)

Much happier with the mileage now... it was well worth the cost of the repair to get this engine back to lean burning status.
Gee, I get more than 7L/100km since new (now 30000 miles). Maybe I should check if the VVTi is working at all! I get enought power and nice torque at low RPM, but the engine is very noisy on hard acceleration. Sometimes it sounds like diesel.
I got crappy mileage during break in as well. This corresponded to about 40 000 km. Another possibility could be a dirty throttle body which could arise if the oil level was overfilled and blow-by has driven debris from the crankcase through the PCV and into the throttle body.
Its funny that you mentioned this, but I just came back from a longer trip and broke my record high MPG in my corolla: 36mpg or 6.5L/100km. Maybe my car is finely "braking in"? Or, more likely, I grew wiser and drove slower (75mpg)!

 

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