Neon L4-2.0L SOHC (1995)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
Target Idle Not Reached (+/- 200 RPM)
NAME OF CODE:
Target Idle Not Reached (+/- 200 RPM)
WHEN MONITORED:
Engine idling and the brake ON. There must not be a manifold absolute pressure (MAP) sensor trouble code or a throttle position sensor trouble
code.
SET CONDITION:
Engine idle is not within 200 RPM of target idle for 2.96 milliseconds.
THEORY OF OPERATION:
The idle air control (IAC) motor is used by the Powertrain Control Module (PCM) to help regulate idle speed. The motor controls the amount of
air allowed to bypass the throttle blade. The PCM controls the motor using four driver circuits to position the stepper motor.
POSSIBLE CAUSES:
-
Driver circuit shorted to ground
-
Driver circuit shorted to battery
-
Driver circuits shorted together
-
Failed PCM
-
Shorted IAC motor
-
Carbon deposits
-
Driver circuit open
