The method of claim 1 further comprising generating a third estimate of the second home position after the startup event, wherein the startup event ends when a speed of the engine exceeds a speed threshold.Ĩ. The method of claim 1 further comprising detecting a crankshaft pulse signal, wherein the relative position is determined within N engine revolutions from the detecting of the crankshaft pulse signal, where N is an integer.ħ. The method of claim 1 further comprising enabling the second camshaft to be phased, wherein the diagnosing of the mis-build comprises: determining a first difference between the first estimate and the second estimate, wherein the second estimate is generated during a first key cycle, and the first estimate is generated during a second key cycle that is after the first key cycle determining a second difference between the relative position and the first difference and determining an engine mis-build diagnostic status based on the second difference and a mis-build threshold.Ħ. The method of claim 1, wherein the relative position is determined based on a detection of a valid position pulse of a crankshaft position sensor, and wherein the detection is independent of an engine synchronization event, and wherein the engine synchronization event comprises determining a position of an engine piston relative to the crankshaft.ĥ. The method of claim 1, wherein the relative position is determined before the first estimate is generated.Ĥ. The method of claim 1, wherein the mis-build comprises slip of a timing element connected between the crankshaft and at least one of the first camshaft and the second camshaft.ģ. A method of operating an engine comprising: determining a relative position between a first camshaft and a second camshaft during a startup event of the engine when the first camshaft is at a first home position and the second camshaft is at a second home position, wherein the first home position is a first preset angular position of the first camshaft relative to a crankshaft and the second home position is a second preset angular position of the second camshaft relative to the crankshaft when the engine is in an OFF state generating a first estimate of the first home position and diagnosing a mis-build of the engine based on the relative position, the first estimate and a second estimate of the second home position.Ģ. System to determine cam phase and cylinder identification for a variable cam timing engineĪutomatic timing governor between crankshaft and camshafts, operating by means of actuators on the shaft connecting chainġ. Variable valve operation timing control device Valve operation timing regulation apparatus for internal combustion engines Method of detecting timing apparatus malfunction in an engine Variable performance valve train having three-dimensional camĮngine valve operation timing control apparatus Method and apparatus for detecting timing belt damage using inductive link coupling Two-step oil control valve failure diagnosticĬAMSHAFT PHASOR SYNCHRONIZATION SYSTEM FOR AN ENGINE SYSTEM AND METHOD FOR DETERMINING A CAMSHAFT POSITION IN A VARIABLE VALVE TIMING ENGINE
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