Talon AWD L4-1997cc 2.0L DOHC Turbo VIN F SMFI (1997)
Idle Speed/Throttle Actuator - Electronic: 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 (TEAT 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
Function
Special patterns
Pattern height
High
Pattern selector
Display
Engine condition
When the engine coolant temperature is 20°C (68° F) or below, turn the ignition switch from OFF to ON (without starting
the engine).
While the engine is idling, turn the A/C switch to ON.
Immediately after starting the warm engine (approx. 1 minute).
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.)
Contrast with standard wave pattern
Probable cause
Induced voltage does not appear or
Motor is
is extremely small.
malfunctioning
Point B: Height of coil reverse voltage
Contrast with standard wave pattern
Probable cause
Coil reverse voltage does not
Short in the coil