Help diagnosing P0401 Trouble Code, VSV?
06-25-2006, 04:04 AM
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Help diagnosing P0401 Trouble Code, VSV?
Hi everyone,
Received a P0401 trouble code "Insufficient EGR Flow". This is on a 2000 4Runner, 3RZFE engine (2.7, 4cyl).
Went ahead and applied vacuum to the EGR valve, the engine sputtered and stalled, so the EGR valve is working.
Attached a vacuum gauge to Q Port of the Vacuum Modulator, registered 20, so it looks like it's within spec. (Any additional tests I can do to make 100% sure it's NOT the modulator?)
I'm thinking at this point it could be the VSV? Where is this VSV and how can I test it to be sure? Any other suggestions on how to pinpoint the problem? Need to do this so I can pass Virginia emissions.
Thanks everyone!
Received a P0401 trouble code "Insufficient EGR Flow". This is on a 2000 4Runner, 3RZFE engine (2.7, 4cyl).
Went ahead and applied vacuum to the EGR valve, the engine sputtered and stalled, so the EGR valve is working.
Attached a vacuum gauge to Q Port of the Vacuum Modulator, registered 20, so it looks like it's within spec. (Any additional tests I can do to make 100% sure it's NOT the modulator?)
I'm thinking at this point it could be the VSV? Where is this VSV and how can I test it to be sure? Any other suggestions on how to pinpoint the problem? Need to do this so I can pass Virginia emissions.
Thanks everyone!
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kawazx636
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