Crankshaft Position Sensor
ECM depends upon crankshaft position sensor for RPM signals. Signals are used by ECM to determine triggering of power transistor and fuel injectors. Faults in CKP sensor or circuit should set a Diagnostic Trouble Code (DTC) PO335 or P1336. For testing procedure, refer to DTC PO335 OR P1336 - CRANKSHAFT POSITION (CKP) SENSOR in TESTS W/CODES article.