Modes of Operation

There is one normal mode of operation during which the engine control module (ECM) controls spark. If the crankshaft position (CKP) pulses are lost the engine will not run. The loss of a camshaft position (CMP) signal may result in a longer crank time since the ECM cannot determine which stroke the pistons are ON. DTCs are available to accurately diagnose the ignition system with a scan tool.