Montero XLS 4WD V6-3.5L SOHC (2001)
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
Cause of problem
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Malfunction of motor. (Motor is not operating.)
Wave pattern characteristics
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Induced electromotive force from the motor turning does not appear.
Example 2
Cause of problem
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Open circuit in the line between the idle air control motor and the PCM.
Wave pattern characteristics
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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.