Galant LS V6-3.0L SOHC (1999)
Point A:
Presence or absence of induced electromotive force from the motor turning. (Refer to abnormal wave pattern.)
Point B: Height of coil back electromotive force
Examples of Abnormal Wave Patterns
Example 1
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Cause of problem
Malfunction of motor. (Motor is not operating.)
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Wave pattern characteristics
Induced electromotive force from the motor turning does not appear.
Example 2
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Cause of problem
Open circuit in the line between the idle air control motor and the PCM.
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Wave pattern characteristics
Current is not supplied to the motor coil on the open circuit side. (Voltage does not drop to 0 volt.)
Furthermore, the induced electromotive force wave pattern at the normal side is slightly different from the normal wave pattern.