Montero Sport LTD 2WD V6-3.5L SOHC (2000)
Wave Pattern Observation Points
1. Check that the standard wave pattern appears when the idle air control motor is operating.
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.