Abnormal Waveforms Examples

NOTE: The size of the waveform patterns can differ greatly, depending on the adjustment of the variable knob on the oscilloscope.

NOTE: Identification of abnormal waveforms is easier when there is a large output current (regulator is not operating). (Waveforms can be observed when the headlights are illuminated.)

NOTE: Check the conditions of the generator malfunction light (illuminated/not illuminated) also, and carry out a total check.

ABNORMAL WAVEFORMS

Example 1
PROBABLE CAUSE: Open circuit in diode

Fig 1: Waveform Graph (Open Circuit In Diode)
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Example 2
PROBABLE CAUSE: Short-circuit in diode

Fig 2: Waveform Graph (Short Circuit In Diode)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Example 3
PROBABLE CAUSE: Open circuit in stator coil

Fig 3: Waveform Graph (Open Circuit In Stator Coil)
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Example 4

PROBABLE CAUSE: Short-circuit in stator coil

Fig 4: Waveform Graph (Short Circuit In Stator Coil)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.