Testing Idle Speed/Throttle Actuator in Diamante Sedan (1999)
Idle Speed/Throttle Actuator - Electronic: Component Tests and General Diagnostics
Oscilloscope Testing
IDLE AIR CONTROL MOTOR (STEPPER MOTOR)
Measurement Method
1. Disconnect the idle air control motor connector, and connect the special tool (test harness: MB998463) in between.
2. Connect the analyzer special patterns pickup to the idle air control motor connector terminal 1 (red clip of the special tool), terminal 3 (green clip),
terminal 4 (black) clip) and terminal 6 (yellow clip) respectively.
Alternate method Crest harness not available)
1. Connect the analyzer special patterns pickup to ECM terminals 14, 15, 28, and 29.(signal wave pattern.)
Standard Wave Pattern
Observation conditions
Standard wave pattern
Wave Pattern Observation Points
