Every vehicle produced has some form of crankshaft position sensor that either reads off the pulley or the flywheel. It helps the ecu determine TDC #1. Even with it failing, the computer will back up with the cam sensor(if equipped), h22's have one. You will just experience long crank times. Takes the ecu a little bit longer to determine TDC #1. Then it'll fire. Once running the ecu bases all timing ignition and injector of the cam sensor. Hope that helps.