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MPI – TROUBLESHOOTING 13A-94 <Standard waveform> Observation Conditions Standard waveform <Explanation of waveforms> and other control signals makes it possible to distinguish between each of the cylinders. • Crank angle sensors are sensors designed to detect cylinder crank angles. For each 2 revolutions of the engine, 4 evenly spaced crank angle sensor HIGH signals are output. So, by measuring the cycle time (seconds), the engine speed can be Engine speed = 2/4T (seconds) x 60 = 30/T (seconds) <Waveform Observation Points> 2 engine revolutions (1 camshaft revolution) Crank angle Camshaft Camshaft position sensor Crank angle sensor Probe switch x1 x1 AC-GND-DC DC DC TIME/DIV. 10ms 10ms VOLTS/DIV. 2V 2V Other - - Engine Idling |