Eclipse GS-T FWD L4-1997cc 2.0L DOHC Turbo MFI (1997)
Idle Air Control Motor: Oscilloscope Patterns and Waveforms
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. (Refer to the abnormal wave pattern.)
Point B: Height of coil reverse voltage
