Hi Andrus
with the vehicle powered down what's the resistance between can + and can - should be 60 ohms approx with the modules connected that contain the termination resistors if you lose one of the resistors you can get some weird bounce back signals

Andrew

Thought I better introduce myself although i had already posted got my first pico scope 4425 a couple of weeks ago although I already had one of their data loggers not new to scopes as electronics has been a hobby for the last 35 years I have to say I do love the software compared to my owon 4 chann...

Hi this is the same as the unit i used UK ebay item number 330742041947 Was hoping to do some waveforms this weekend to show if its ground side switched or supply + switched or both but a jag with coms problems got in my way. This is no way a ready to go unit i made leads up on mine just to clip on ...

Ok will sort out some wave forms this weekend and a link to where i got mine

Thanks andrew

Hi Richard dont know if you got sorted with a pwm generator but if not i can point you in the direction of one with a % read out it comes a a pre assembled pcb board no case i use mine to test iac and other solenoids as well as ac variable displacement compressors cost me more for a box to put it in...