No bus means there is no signal from the PCM,most likely a bad PCM,but check all your fuses and connections on PCM
Try the crank sensor first, then the cam sensor. without these the car will not spark. Most commonly the crank sensor though.
possibly your crankshaft sensor or ignition control module
Remove the fuel pump relay or fuse and crank the engine until it stalls..................
check your crank sensor
crank is nothing but disk and it is a rotating part and it is couple with crank shaft
it could be your crank posistion senson or alternator failing get a dia and a load test on alternator
Its either your cam shaft position sensor or the crank sensor.
Hurdy gurdy
crank or cam shaft position sensor is sometime the issue.it will not fuel if it cannot find the position of the cam or crank
is the computer setting a code or check engine light, if not it could be your crank sensor.
The Ford F150 cranks and immediately stalls and shuts off. It will crank again, but it shuts off. The guages move back and forth also
steel drum