Question about 2000 Toyota ECHO

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Vacuum leak-P0171 2000 Toyota Echo. Need vacuum diagram

Failed smog check. OBD Fault code is P0171. I am looking for a diagram of the vacuum system and info on the most common vacuum leaks the Echo has.

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  • hashimo May 20, 2009

    You R THE BOMB! Thank you soooooo much.

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A P0171 code does not indicate a vacuum leak; it indicates a dirty mass air flow sensor. This device is located between the air filter box and the intake manifold. Locate it, unplug the wire harness, and remove the 2 screws that holds it onto the intake pipe. Look down inside th sensor, you will see 2 small wires, that are probably covered with fuzzy things...using a spray cleaner, such as brake cleaner, spray the 2 wires until they are clean and shiny. Do NOT use compressed air, that will damage the sensor. When it is clean; reinstall it and drive it. The computer will recognize the now clean sensor, and your troubles will be over.

Posted on May 19, 2009

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  • Lori Reynolds Aug 30, 2013

    I was told by an reliable source to only use CRC mass air flow sensor cleaner only! never brake cleaner PS damaged mine! replaced 2 years ago lesson learned!

  • Lori Reynolds
    Lori Reynolds May 05, 2014

    it passed smog in 2011 iwth replacement of MAF

  • Lori Reynolds
    Lori Reynolds May 05, 2014

    had code P0171 2000 Toyota Echo

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Sounds like i have a vacuum leak in my 2000 echo. when i rev the engine then let go of the pedal it sound like almost a pressure release valve is purging air.

Posted on Feb 02, 2010

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Posted on Jan 02, 2017

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The P0171 is an indication that the engine is running lean and the P1443 is a fault associated with the Purge Control Valve Solenoid trouble code control valve.

Inspect under the hood for a disconnect vacuum line.

The photos are examples of the vacuum circuit connect via hoses. Listen for a vacuum leak when the engine is running. It would be a whistle sound. Also if work has been done recently look in the area that the work was done under the hood.

26150454-uk2ysmhepcorsq0r4fy0hyob-4-0.jpg

26150454-uk2ysmhepcorsq0r4fy0hyob-4-2.jpg Hope this helps?

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From a reputable repair website:


P0351 - OBD-II Trouble Code

Auto Systems and Repair

Ignition Coil "A" Circuit Primary/Secondary Malfunction Our emissions expert has put together the following information about the P0351 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
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Common Problems That Trigger the P0351 Code
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