[urq] reference sensor bench testing

[PETER]

Enjoy your day....

On Aug 29, 2009, at 9:04 PM, Mike Del Tergo <mdeltergo at hotmail.com>  
wrote:

> This is exacty what I was thinking of.  I didn't know if a simple  
> screwdriver across the sensor was enough or maybe an attachment on a  
> rotary toll whizzing by at a good clip.
THE ECU ONLY USES THE REFERENCE SENSOR FOR THE FIRST ROTATION OF THE  
ENGINE SO THE SCREWDRIVER TRICK WORKS FINE
> Not sure on the 20V sensor, but I haveOhms at rest on this sensor. I  
> do get a flutter on the DMM when rapidly fluttering a steel rod by  
> the sensor (set for small electrical reading not Ohms).
YES AN OHM METER WILL PICK UP THE SCREWDRIVER BUT IT WONT PICK UP THE  
SIGNAL FROM THE PIN.........A SCOPE WILL.
>   Seems like and oscilliscope/sensor swap are in my future as well  
> as a double check for the ref pin.  Can you tell me the best way/ 
> opening of checking to see if the pin is still there?
IF YOU HAVE A SCOPE THE PIN WILL SHOW UP WHEN YOU CRANK THE ENGINE. IF  
NO SCOPE THEN YOU CAN PULL THE SENSOR; PLACE CAR IN FOURTH GEAR AND  
ROCK CAR UNTL YOU CAN SEE THE PIN THROUGH THE OPENING FOR THE SENSOR
> Also did you ever find what caused the "mechanical" jump in timing?
NO. THERE ARE DIFFERENCES OF OPINION HERE AND A BET. THE MAJORIY THINK  
THAT THE KEY ON THE CRANK CAM GEAR HAS MOVED/SHEARED. I DONT THINK SO  
BECAUSE THE MARK ON THE FLY WHEEL AND THE MARK ON THE CAM GEAR BOTH  
LINED UP ON THEIR RESPECTIVE MARKS. I BELIEVE THE SLACK IS SOMEWHERE  
IN THE HEAD/DISTRIBUTOR. DENNIS IS GOING TO REPORT BACK WHEN HE FINDS  
OUT

PETER
> thx
> Mike
>
>
>
> Subject: Re: [urq] reference sensor bench testing
> From: audionly at gmail.com
>
>  Then hooked the sensor back up and hooked an ohm meter to it and  
> turned the car over..........No reading on the ohm meter. Then I  
> pulled the sensor out of the block and ran a screwdriver back and  
> forth across the face and the ohm meter moved.  Then we tried  
> another known good sensor with the same results. Next we had heard  
> of a issue where the sensor loses some of it's magnetism and to  
> measure the distance from the sensor to the pin with some modeling  
> clay. No issue there. Then we plugged the sensor back into the  
> harness but left it out of the block. I ran a screwdriver rapidly  
> across the face of the sensor while Dennis cranked the  
> car............... It started. (No one had ever heard of doing this  
> but it does make sense once you analyse it. The computer is looking  
> for an exact pulse from the hall generator and the reference sensor.  
> Then Davey Jones suggested using a scope instead of an ohm meter. It  
> picked up the signal from the sensor.
>
>
>
>
> On Sat, Aug 29, 2009 at 5:08 PM, Mike Del Tergo  
> <mdeltergo at hotmail.com> wrote:
>
> Ingo,
>
> I had thought that the reference pin swinging by generated and  
> electrical field of some measurable output and thought there might  
> be another way to generate a field and measure.  I will Ohm the unit  
> for starters.
>
> Thx
>
> Mike
>
>
>
> Get back to school stuff for them and cashback for you. Try Bing now.