DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM 1. Start engine and allow engine to idle. Using scan tool, read engine speed at PCM. Compare engine speed displayed on scan tool with engine speed on tachometer. If engine speed on scan tool is not within 100 RPM of engine speed on tachometer, go to next step. If engine speed on scan tool is within 100 RPM of engine speed on tachometer, DTC is inactive at this time. Shut engine off. Inspect ECM and PCM for dam