"cea1" <
[email protected]> wrote in message
news:
[email protected]
> Does anyone know the specific intrepretation of diagnostic code 0340. I do
> know that it has something to do with a cyclinder misfiring, but what I'm
> not sure of, is does that mean that there's a bad coil, fuel injector,
> spark plug, or valve? Also, how do I test for problems with either of
> these components?
>
> This code is for a 1995 Toyota Avalon.
>
Code P0340 means camshaft position sensor circuit malfunction
The diagnostic code P0304 means that a misfire was detected in Cylinder 4.
Since you ask about misfiring, I'm assuming the 0340 in the text body was a
typo and the 0304 in the subject is correct.
When the DTC says that a misfire was detected in cylinder 4, and the check
engine light is on, it means that the system detected at least 1 misfire per
1,000 engine revolutions. If the check engine light is flashing then it
detected at least 1 misfire per 200 engine revolutions and you need to get
the condition resolved soon before it ruins your catalytic converter.
The DTC does not give you the cause of the condition - it only gives a
condition. A cylinder misfire can be caused by a problem with the things
you mentioned as well as ignition timing, the wiring between the components
you listed and the ECU, and the ECU itself. Rather than taking wild guesses
and replacing parts, the smart thing to do would be to check the components.
If a spark is intermittent, proper equipment like an oscilloscope is needed
to diagnose.
--
Ray O
correct the return address punctuation to reply
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