Stealth R/T Turbo V6-2972cc 3.0L DOHC Turbo (1996)
Idle Speed/Throttle Actuator - Electronic: Component Tests and General Diagnostics
Troubleshooting Hints
Hint 1:
If the stepper motor step increases to 100 to 120 steps or decreases to 0 step, faulty stepper motor or open circuit in the harness is suspected.
Hint 2:
If the idle air control motor harness and individual part checked good but the stepper motor steps are out of specification, the following
faults are suspected.
1. Poorly adjusted reference idle speed
2. Deposit on the throttle valve
3. Air leaking into the intake manifold through gasket gap
4. Loose EGR valve seat
5. Poor combustion in the cylinder (faulty ignition plug, ignition coil, injector, low compression pressure, etc.)
Actuator Inspection
Idle Speed Control Servo Circuit
CHECKING THE OPERATION SOUND
1. Check that the operation sound of the stepper motor can be heard after the ignition is switched "ON" (but without starting the motor).
2. If the operation sound cannot be heard, check the stepper motor's activation circuit.
If the circuit is normal, it is probable that there is a malfunction of the stepper motor or of the Engine Control Module.
CHECKING THE COIL RESISTANCE
