check the mounting bracket that holds the ecu or the breakers in the engine comp.it is bolted to the floor and uses that for a ground.had same problem on 9600,but its been few years,and i can't remember for sure which one
start signal wire circuit code #107 Tee's in at engine starter relay then goes through Connector C701 and then directly into ECU---------so if engine cranks then wire is good to starter relay----i would check C701 as that is a problem area and i have replaced many corroded pins here---and this is a 16-pin connector located under hydaulic reservoir-----make sure there is no voltage drop across engine compartment relays while there under load as i have seen these cause intermittent problems
did more research on error code E72 and this is not a start signal error[ E41 is]-but e72 means diagnostic codes output signal is stuck low which means there is a problem with communication between ecu and tach on wire cc132 through rh harness
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