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MPI – TROUBLESHOOTING 13A-98 <Abnormal waveform> Waveform characteristics • Example 2 Current is not supplied to the motor coil on the open circuit side. (Voltage Cause of fault Circuit is broken between the motor and engine ECU. 10-5 Ignition coil (power transistor control signal) (MBB991658). (All terminals should be connected) (2) Connect oscilloscope probe to ignition coil connector terminal No.3. Note (3) To check ignition advance condition, simultaneously observe crank angle sensor output signal. <Standard waveform> Observation conditions Open Normal Oscilloscope Power transistor control signal Crank angle sensor Probe switch x1 x1 AC-GND-DC DC DC VOLTS/DIV. 2V 2V TIME/DIV. 10ms 10ms Other - - Engine speed About 1,200 rpm |