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check component B4/3 ( fuel tank pressure sensor).
check the actual value. fuel tank pressure difference: 12.35 hPa. specified value should be -33...-35 hPa. if yes or no, tell me for the next step.
test voltage supply of fuel tank pressure sensor. voltage: 4.7....5.3 volt. if yes or no, tell me for the next step.
check component Y58/1 (purge control valve).
since you said you have tested it, heres what the test should be:
*actuation of component Y58/1
**test current consumption of component Y58/1
***perform mechanical inspection of component Y58/1
the detailed test programs are available if you want.
i know what you mean, it will give the FAULT CODE P0451, P0452, P0453.
did you know that P0455 was modified to "major leak in purge system, hose in system not connected or cap open"?
if we are doing the diagnosis, we should not leave anything unattended. the computer can only tell you the malfunction that it sense through pre-programmed datas... but it doesn't know the real problem.
the rest all depends on you.
the computer cannot use us to find the problem, but we use the computer to find the problem.
you are in full control, and you will use all six senses you got in order to know something.
doing diagnosis is not a job at all, but a plaything where you can have fun... similar to a kid discovering new things that amazes them. this is for as long as you now what you are doing.