Engine Speed (RPM) Sensor

RPM sensor is an inductive pick-up located on the left side of engine block by the flywheel. MFI ECM receives one voltage pulse per ring gear tooth (135). The voltage signal is used by MFI ECM to determine engine speed and to calculate ignition and injection firing points. ECM will not allow engine to start if RPM sensor signal is not received within 5 seconds. RPM sensor is adjusted at factory. If sensor bracket is removed, mark position of bracket on cylinder block for reassembly reference.