Oscilloscope Patterns and Waveforms

STEPPER MOTOR MEASUREMENT METHOD
1. Disconnect the stepper motor connector, and connect the special tool (test harness: MD998463) 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 (blue clip), terminal 4 (black clip) and terminal 6 (yellow clip) respectively.

ALTERNATE METHOD (TEST HARNESS NOT AVAILABLE)
1. Connect the analyzer special patterns pickup to ECM terminal 4, connection terminal 5, connection terminal 17, and connection terminal 18 respectively.




STANDARD WAVE PATTERN OBSERVATION CONDITIONS




STANDARD WAVE PATTERN




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.
Point B: Height of coil reverse voltage







EXAMPLES OF ABNORMAL WAVE PATTERN
Cause of problem
Motor is malfunctioning. (Motor is not operating.)
Wave pattern characteristics
Induced voltage from the motor turning does not appear.