good or bad

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good or bad

Postby ecosse » Tue Jun 14, 2011 7:08 pm

just took this capture what does anyone think its a 206 crank and and fuel pump :D from an intermitant non start
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pug 206 crank and bad fuel pump.psdata
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ecosse
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Re: good or bad

Postby Alan » Tue Jun 14, 2011 7:35 pm

That does look like a fuel pump on its way out. Its always good to have examples of faulty components.

Any chance of capturing over a longer duration say 20ms/div so we can see a repeating pattern on the pump / complete engine cycle?
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Re: good or bad

Postby ecosse » Wed Jun 15, 2011 1:52 pm

sorry got the pump out and replaced though did notice that when i scoped the pump on the bench it seemed to be ok :D have ordered new pump will post up new capture when fitted
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Re: good or bad

Postby Lee » Thu Jun 16, 2011 6:31 pm

Hi

Just out of interest, what is the Exact Vehicle Details i.e.

Peugeot 206

Year......
Engine Type.......
Engine Code.......

I look forward to hearing from you

Lee - Automotive Technical Specialist :D
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Re: good or bad

Postby Alan » Thu Jun 16, 2011 6:47 pm

Thanks - please do post a capture with the new pump. Let me explain my request a bit better....

At 20ms/div (or longer) you will have at least one complete engine cycle so everything occurs at least once. Your waveform worries me a little bit as a fuel pump on its way out usually shows drops in current rather than a rise. I wanted to see a longer timebase just to be sure that the peak in current is not related to an injector or ignition coil firing.

I suspect Lee has asked for the exact model for similar reasons - is there any chance that the circuit you measured also supplies other components. This can be a risk when measuring from fuses in particular, it might say its the fuse for the fuel pump but on some cars this can mean fuel pump plus a load of other stuff as well.
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Re: good or bad

Postby ecosse » Thu Jun 16, 2011 8:51 pm

pug 206

2001 1.6 8v petrol

is the model also think i may have made an error oops since the fuse i think may power something else although i did not have a wiring diag. at the time i did pull the fuse and using live data checked for 02 sensor volts etc and seemed ok and did not log any fault codes also i looked at the capture and the rising bad bit is not in the same place each time which i am bassing on the fact that this part of the trace is not always in the same place based on the missing tooth on the flywheel it did seem random
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