Montero SR 4WD V6-3.5L SOHC (1997)
Idle Speed/Throttle Actuator - Electronic: Oscilloscope Patterns and Waveforms
Wave Pattern Inspection Using an Analyzer Measurement method
(1) Disconnect the stepper motor connector, and connect the special tool (test harness: MB998463) in between.
(2) Connect the analyzer special patterns pickup to the stepper motor-side connector terminal (1) (red clip on the special tool), terminal (3) (green
clip), terminal (4) (black clip) and terminal (6)
(yellow clip) respectively.
Alternative method (when test harness is not available)
Connect the analyzer special patterns pickup to ECM terminals (4), (5), (17) and (18).
Standard wave pattern Observation conditions
Standard wave pattern
The wave pattern appears for an instant, but soon disappears.
Wave pattern observation points
Check that the standard wave pattern appears when the stepper motor is operating.
Point A: Presence or absence of induced voltage from the motor turning. (Refer to the abnormal wave pattern.)
Point B: Height of coil back electromotive force.
