Montero Sport V6-3.5L SOHC (2004)
1. Connect the oscilloscope probe to PCM terminals No. 14, No. 15, No. 28 and No. 29.
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
Cause of problem
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Malfunction of motor. (Motor is not operating.)
Wave pattern characteristics