n14 fan almost always on

Usually in those old volvos I've checked over and over and sometimes it never works unless u plug a new one in and test it

 

sent it to a local guy in manitoba, who fixes electronics, IF they can be repaired, ecm's are really fragile, if the circuit board is burnt or cracked, you might as well as get a new one or reman one and send your old one for core... does something happen at 1.7 million miles???

 

sorry i misread what you said, if your in the states you should check these guys out, and no i don't know what the resistance is suppose to be, you could maybe just take measurements of each circuit, and compare an average? just a suggestion, they have a pinout and whole engine wiring diagram on this site too.

Midwest ECM Repair
201 Rangeview Loop
Westcliffe, CO 81252
Phone (719) 783-3399
http://www.midwestecmrepair.com

 

I've heard of those guys did my buddy's elm they did a great job fast and reasonably priced

 

ANYTHING is possible... lol everything does have a life span, so i agree it can wear out

as for the open circuit reading, in that circuit when the engine is running, its pulsing a ground to complete the circuit to open the nozzle, letting fuel out, so i believe thats why your not getting a reading, cause your trying to measure a normally open circuit. anyone please correct me if i'm wrong

 

please keep me posted what you fixed, or replaced, and how it goes