Crank sensor test

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gulfbluersr

New Member
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124
Location
Aberystwyth
Hi

Still struggling with getting a spark to my plugs after fitting my new block, before spending out for a new crank sensor could anyone tell me how to test the one I have?

Or help me work out why I have no spark??

Thanks

Steve
 
Agh my dads a retired tv engineer, if he has a scope still will this work the same as an automotive one?

He also has good understanding of electronics........I dont!........ Would he be able to tell anything with with a good meter?
 
Ok thanks, I guess if he's not got a scope he can prob borrow one, he used to own the business!

I also guess if I ask him to scope the sensor he will know what to do.......

If it's not the sensor where do I look next?

I asked in my other thread whether or not if I had the cam timing out would that upset the sync between the cam and crank sensor then not allow ecu to send the right signals?

Steve
 
Right, spoke to pops earlier and as I thought he said "yep no prob Still got a scope, will be round tomorrow and check it out"

So hopefully I will know if it is the crank sensor or not........ I hope it is then at least the problem is sorted, trouble is I can't see why it should be faulty as it drove into the garage and was fine then so why should it give up just from being swapped from one block to another?

Anyway he asked if anyone could point me to the spec of the pulses or the sensor as then he would be able to tell me not just if it is pulsing but also if it is pulsing correctly to spec.....so any help with this?

Steve
 
Well progress or not I'm not sure!!

Dad came around with his scope got all set up, I pulled the plug and said here you are get on with it......... There is 3 wires the scope works on 2!

We tested the 2 outer together....... nothing, then each way of one outer and the inner on both ways nothing, as Dad says though this does not necessarily prove anything as almost definitely the 3 wires need to be tested with some sort of adapter, without the adapter we were stuffed, or can you tell me that the tests we did should have given us a pulse?

I guess with an automotive scope set up there is adapters to go with these things?

Steve
 
The air gap should be around .060" between the sensor tip and the nib on the drive plate.
Look here for info. on connecting scope.
[nomedia="http://www.youtube.com/watch?v=H5rfWyLSfyI&feature=relmfu"]YouTube - ‪How to Test Crankshaft and Camshaft Sensors 2‬‏[/nomedia]

You may have to connect the negative lead to a negative point on the car (Body) and the positive to one of the CPS wires to pick up the signal. There are only two relevant wires to the sensor plug, black & yellow and black and white, try them one at a time till you get a result. The other wire to the plug is a shield wire to stop interference from other electrical equipment.
Use a 5V scale.
 
Last edited:
Well just to update this thread and to say a big thanks you to all who offered suggestions and help with the problem, especially Irish and 'J' you are both superb!! going well beyond anything I've ever seen or had from any other forum!!!!

In the end all the problem was caused by me! when I stripped the old engine out and removed the sensor there was 2 spacers between the nuts and the sensor, I removed the sensor and put the spacers back over the studs to keep them safe, when I refitted the sensor I put it ontop of the spacers not remembering or noticing them! This put the sensor 15mm away from the flywheel..... no chance of it reading anything hense no pulse hence no spark!! big head scratcher but worked it out in the end and now all is well, so once again thanks for the help :) just need to sort a new air flow meter now, ordered a new gen Bosche one so hopefully that will sort out the next problem on the list, then gotta sort the tramlining, then the..........

Steve
 
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