Outline Of Diagnosis

Detect the open or short circuit of crankshaft position sensor.

Normally, the crankshaft position sensor signal and camshaft position sensor signal are input as shown below. But judge NG when continuing not to input the crankshaft position sensor signal.

Fig 1: Crankshaft Position Sensor Blinking Pattern

Courtesy of SUBARU OF AMERICA, INC.

• Cylinder judgment method 

When inputting BTDC97°CA crankshaft position sensor signal, judge what cylinder piston is brought to the top dead center of compression by camshaft position sensor signal number.