How to test ECU? (1 Viewer)

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I’ve got the FSM and a multimeter… but… physically how do you test the sucker? Just jam the probes behind the wires? Get thinner probes? Any help would be appreciated. This rig keeps throwing me curveballs :)
 
I’ve got the FSM and a multimeter… but… physically how do you test the sucker? Just jam the probes behind the wires? Get thinner probes? Any help would be appreciated. This rig keeps throwing me curveballs :)
Unsure on testing but you could use paper clips straight and use probes onto them..
 
GREAT call. Thank you! Finally getting back in the garage. ECU testing telling me the issue is grounds or the ECU itself. Here we go down the grounding rabbit trail!
 

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