Crank Signal

Crank Signal
The crank signal is sent from the starter motor circuit. When the starter motor circuit is energized (ignition switch in the START position), a crank signal is supplied to the PCM. The PCM increases fuel delivery (fuel injector pulse) when receiving a voltage on the crank signal circuit. The slight increase in fuel provides quicker and smoother engine start up. The crank signal is also used as an input for running certain engine control system diagnostics, such as the CKP sensor DTC P0335. The crank signal input can be monitored on a scan tool as the Starter Switch parameter.