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P1667 TCV Circuit malfunction

Tiny
TONYMINJA
  • MEMBER
  • 2001 TOYOTA CROWN
Six cylinder two wheel drive automatic 115,000 miles.

Engine light is on with the reading p1667 TCV circuit malfunction. What is meant by TCV and what can be the problem?
Wednesday, November 10th, 2010 AT 7:22 AM

12 Replies

Tiny
SE55Y
  • MEMBER
  • 2 POSTS
Toyota's TCV stand for Tumble Control Valve. Problem can be in VSV (vacuum switching valve) controlling vacuum actuator to close-open six small throttle plates inside intake manifold.
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Wednesday, June 22nd, 2011 AT 7:04 AM
Tiny
MOS DIZ
  • MEMBER
  • 13 POSTS
Hi,
I am facing a similar problem in a 2003 Toyota crown. Did you resolve the issue?
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Monday, March 18th, 2019 AT 11:13 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,722 POSTS
This post is pretty old I don't know if they will come back can I ask which engine you have?
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Monday, March 18th, 2019 AT 12:45 PM
Tiny
SE55Y
  • MEMBER
  • 2 POSTS
We faced P1667 error code on 1JZ-FSE and 2JZ-FSE engines. Check and replace mentioned above valve if failed.
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Monday, March 18th, 2019 AT 5:57 PM
Tiny
MOS DIZ
  • MEMBER
  • 13 POSTS
The engine is 2JZ-FSE. I have tested the valve and it doesn't seem to be working. Will replace with a new one and let you know guys
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Tuesday, March 19th, 2019 AT 5:15 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,722 POSTS
Please let us know what you find. We are interested to see what it is.
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Tuesday, March 19th, 2019 AT 10:24 AM
Tiny
MOS DIZ
  • MEMBER
  • 13 POSTS
The problem was in the vacuum switching valve, not the electrical connection. Once I replaced the valve with a new one, the check engine light disappeared. Funny thing is, the dash board was previously displaying TRC and VSC errors before but after replacing the above valve, all these errors disappeared; don't know how they were all connected.
Anyway, thanks to everyone who chimed in on various ways to troubleshoot the issue. Problem is now solved.
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Tuesday, March 19th, 2019 AT 11:53 PM
Tiny
KEN L
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Good to hear, please use 2CarPros anytime we are here to help.
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Wednesday, March 20th, 2019 AT 12:10 PM
Tiny
MOS DIZ
  • MEMBER
  • 13 POSTS
I seem to have solved one problem while causing a different one. After replacing the vacuum valve (and getting rid of the check engine light), the car now is having a hard time starting. After turning the key, the engine will keep cranking without fully starting for about five times before it fires. What could be the issue?
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Friday, March 22nd, 2019 AT 7:29 AM
Tiny
KEN L
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It sounds like you may have a vacuum leak lets run down this guide to see what you find:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

This might help as well:

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Please run down this guide and report back.
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Saturday, March 23rd, 2019 AT 2:23 PM
Tiny
MOS DIZ
  • MEMBER
  • 13 POSTS
Thanks for the tips, I'll let you know what I find.
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Saturday, March 23rd, 2019 AT 11:30 PM

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