DTC P2770 Dodge

Description

DTC P0102, P0103, P0107, P0108, P0121-P0123, P0300, P0301-P0306, P0401-P0405, P0440, P0442, P0446, P0502, P0503, P1404 and P1441 not set, engine started, engine runtime over 2 minutes, system voltage over 10.0v, vehicle speed less than 3 mph, ECT sensor more than 158ºF, IAT sensor more than 5ºF, TP angle less than 1%, BARO sensor more than 65 kPa, and the PCM detected that Actual idle speed was more than 75 rpm higher than Desired idle speed for 15 seconds. The IAC valve, mounted on the throttle body, is used to control the engine idle speed. The IAC valve pintle moves in and out of an idle air passage bore to control airflow past the throttle plate. The IAC valve consists of a movable pintle, driven by a gear attached to an electric motor called a stepper motor. The stepper motor is capable of highly accurate rotation (called steps). The stepper motor has two separate windings called coils. Each coil is supplied current by two circuits from the PCM. Each time the coil changes polarity, the stepper motor moves one step. The PCM uses a predetermined number of counts to calculate IAC pintle position.