(Auto Electrics) How to read Ohms?

[Jake]

I'm trying to find a fault on my bike. I suspect the Crank Position Sensor might be faulty.

 

the workshop manual says across the two pins on the plug from the CPS I should have 248 ~ 372Ω with "Tester selection position at Ωx100"

 

Now, my voltmeter doesn't have a Ωx100 setting but it has Ω settings for 200, 2k, 20k, 200k, 2m

 

When I test the CPS plug terminals using setting 200Ω the digital display just shows "1" - which means Out Of Range/Off Scale I believe.

When I test the CPS with setting 2k it shows "0.89"

And 20K shows "0.9"

 

Anyone know what's going on here? I'm totally confused.

As you can tell, I know nothing about electrics.

 

 

Thanks

[monsween]

Are you sure your reading it properly or using the correct pins.

 

As 2K and 20K should be 0.89 - 0.089 respectively

[Scott]

Sounds like it is open circuit bud. Does it say anything after the 0.89? Such as M or G?

 

It will either be less than 1 ohm or 890ohms IMO. Either way its fooked. Going by the 200 being out of range it would appear to be 890 ohms.

[edge]

on the 2k setting you need to look for 0248 ~ 0372 or 0.248 to 0.372 etc

[Jake]

As 2K and 20K should be 0.89 - 0.089 respectively

Why should it? I don't understand that. It's a digital meter, if it's within range it should display the correct reading not some 10x 100x multiple - shouldn't it? (I dunno just seem logical)

 

Sounds like it is open circuit bud. Does it say anything after the 0.89? Such as M or G?

 

It will either be less than 1 ohm or 890ohms IMO. Either way its fooked. Going by the 200 being out of range it would appear to be 890 ohms.

Makes sense. Thanks.

I hope it is fooked cos that means I've found the problem at last. At the other end of the wires reading from the solder points on the CPS itself I was getting a reading of just over 300 Ohms.

 

on the 2k setting you need to look for 0248 ~ 0372 or 0.248 to 0.372 etc

So it is a multiple, how odd.

 

 

 

thanks chaps.

[Jake]

Are you sure your reading it properly or using the correct pins.

 

As 2K and 20K should be 0.89 - 0.089 respectively

I just checked it again and now it's reading

 

.285 (No leading zero) at 2k setting

and

0.29 (with leading zero) at 20k

and

00.3 at 200k (two leading zeros)

 

and

1 at 200

 

So it must be 285 Ohms I guess.

Which means I haven't found the fault. Bugger.