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How can I check Crank Position Sensor for a signal

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Old Aug 23, 2005 | 07:10 PM
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Default How can I check Crank Position Sensor for a signal

Other than watching the rev counter needle move. I have 2 or 3 sensors kicking about including 1 brand new one but now I'm wondering if its picking up a signal from the flywheel. How can I tell?
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Old Aug 24, 2005 | 09:20 AM
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Originally Posted by Lee-j
So if I run a temporary live feed to the wire going into pin 2 of the coil that should do I reckon, then if that turns out to be the problem I can investigate the wiring side of things. I'll try that over the weekend!
BTW, did you ever end up trying that?

Checking for the signal is not straight forward without some proper tools. Oscilloscope is the proper tool for the job, but a handy person can use a laptop's microphone input for the same thing.
The signal should roughly look like this:
http://www.bgsoflex.com/mjl/sum1.jpg
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Old Aug 24, 2005 | 04:38 PM
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Thanks again JT, yes I did try that and no luck still. Only option now i think is to replace the main loom, all the components have been replaced including the under bonnet loom and still nothing. Thanks for your earlier advice too, u gave me a good few things to try that I'd not have known
Also would I be right in thinking the CPS reads a missing tooth to make a pulse rather than 1 sender attached to the flywheel?
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Old Aug 24, 2005 | 09:29 PM
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whats the problem with yu car mate?
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Old Aug 24, 2005 | 09:34 PM
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It wont spark, been at this for nearly a month now tried everything with no luck. Its an H reg xr2i One day it just stopped and was towed to a garage and sat there for a year, now its been given to me and I cant get it going! Have replaced coil pack, ecu, crank sensor edis module and underbonnet loom with no joy so far
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Old Aug 24, 2005 | 10:07 PM
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sounds like the ecu isnt switching on.
either an earth or there is an engine running wire from the incar loom that links to the engine loom, just bypass this wire so its on all the time and then try it
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Old Aug 25, 2005 | 08:50 AM
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Have you checked the wire that goes from EDIS to the crank sensor. This takes a lot of chaking and heat and can get damaged.
The system is so simple, so the fault must be something simple too.
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