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: Abnormal Waveforms - Example 1
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Example 2
PROBABLE CAUSE: Short-circuit in diode

Fig 2: Abnormal Waveforms - Example 2
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Example 3
PROBABLE CAUSE: Open circuit in stator coil

Fig 3: Abnormal Waveforms - Example 3
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Example 4
PROBABLE CAUSE: Short-circuit in stator coil

Fig 4: Abnormal Waveforms - Example 4
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.