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Check engine, VSC and VSC off lights on all the time, codes, P1346 and P1351

Tiny
JBILAND
  • MEMBER
  • 2001 TOYOTA AVALON
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Engine performs very well. Scanned computer codes P11650, P1346 and P1351. Changed both cam position sensors and forward O2 sensor. Lights stayed out one drive cycle then after that came on and stay on. Again car performs very well. Obviously need some help to correct situation. Thanks
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Tuesday, August 6th, 2019 AT 12:43 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
Hello,

Can we double check the P11650? It has one too many numbers in it. How does the engine seem to run? Can you please shoot a quick video with your phone so we can see what's going on? That would be great. You can upload it here with your response.
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Wednesday, August 7th, 2019 AT 7:54 PM
Tiny
JBILAND
  • MEMBER
  • 6 POSTS
Rescanned car this morning and only have 2 codes, P1346 and P1351. Again car starts and runs great. No driveability issues ! I am truly at a loss. Changed both cam position sensors and forward bank O2 sensor.
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Friday, August 9th, 2019 AT 7:43 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
The P1346 is a cam actuator problem while the P1351 is an ignition system issue. The P1346 can be caused by low or dirty engine oil which allows the seals to bypass

Here is a guide to show how it works:

https://www.2carpros.com/articles/how-camshaft-variable-valve-timing-works

and

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

Let me know. Please run down this guide and report back.
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Friday, August 9th, 2019 AT 12:47 PM
Tiny
JBILAND
  • MEMBER
  • 6 POSTS
It seems things are getting worse each day. Yesterday the car ran bad at lower RPM's you give it half or more throttle it would take off like a rocket and not miss a beat. Scan car got the following codes: P0300, P0302, P0304, P0306, P0175 and P1150. Erased codes today and it drove just fine for a while the check engine light came on. Codes today were: P1150, P0300 and P0175. I'm beginning to think I have a bad ECU.
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Tuesday, August 13th, 2019 AT 9:27 AM
Tiny
JBILAND
  • MEMBER
  • 6 POSTS
Hopefully you can shed some light on this problem. Thanks
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Tuesday, August 13th, 2019 AT 9:27 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
It does seem to have many unrelated problems. I would get a used ECU and plug it in to see what happens or send it out to have it tested. Also we can test the wiring by using this guide and the engine wiring diagrams below:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what happens.
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Tuesday, August 13th, 2019 AT 10:06 AM
Tiny
JBILAND
  • MEMBER
  • 6 POSTS
The saga continues. Because there were so many bank 2 sensor 1 codes I first replace the O2 sensor with an OEM sensor. Car ran better but still got eng lite. New code of P0174, erased code drove again now P0125, P0174, P1150. I did get a used ECM and tried it but car wouldn't start. Put old ECM in and car runs fine but still have Eng light and VSC lights. I still think it's the ECM so I'm going to order a reconditioned one. I'll keep you posted.
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Sunday, August 18th, 2019 AT 8:02 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
Yep you are headed in the right direction. Please let me know.
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-1
Sunday, August 18th, 2019 AT 12:50 PM
Tiny
JBILAND
  • MEMBER
  • 6 POSTS
Just an update, have a reconditioned ECU with coded keys coming. I'll let you know if it works.
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Friday, August 23rd, 2019 AT 3:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
Good job, let me know.
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Monday, August 26th, 2019 AT 11:18 AM

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