DTC P0505: Idle Air Control Motor Circuits (2.4L): Testing

Turn ignition on. Using scan tool, read DTCs. If Good Trip counter is displayed for DTC P0505 and displayed count is "0", go to next step. If Good Trip counter for DTC P0505 is not displayed or displayed count is not "0", go to step 8.
Turn engine off. Disconnect IAC motor connector. IAC motor is located on side of throttle body and has a 4-pin connector. Disconnect PCM connectors. PCM is located on left side of engine compartment, near front of battery. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance between Violet/Dark Green wire and Violet/Light Green, Brown/Light Green and Brown/Dark Green wires at IAC motor harness connector. If any resistance reading is less than 5 ohms, Violet/Dark Green wire is shorted to wire with resistance less than 5 ohms. Repair wiring as necessary. If all resistance readings are 5 ohms or more, go to next step.
Measure resistance between Violet/Light Green wire, and Brown/Light Green and Brown/Dark Green wires at IAC motor harness connector. If any resistance reading is less than 5 ohms, Violet/Light Green wire is shorted to wire with resistance less than 5 ohms. Repair wiring as necessary. If all resistance readings are 5 ohms or more, go to next step.
Measure resistance between Brown/Light Green and Brown/Dark Green wires at IAC motor harness connector. If resistance is less than 5 ohms, Brown/Light Green and Brown/Dark Green wires are shorted together. Repair wiring as necessary. If resistance is 5 ohms or more, go to next step.
Remove Auto Shutdown (ASD) relay from Integrated Power Module (IPM). IPM is located on left side of engine compartment, next to battery. Connect a jumper wire between terminals No. 30 and 87 at ASD relay socket in IPM. Turn ignition on. Measure voltage between ground and each terminal at IAC motor harness connector. If voltage is one volt or less at each terminal, go to next step. If voltage is more than one volt at any repair short to voltage in appropriate circuit between PCM and IAC motor. See WIRING DIAGRAMS article.
NOTE: The Intelligent Power Module (IPM) may also be referred to as Integrated Power Module (IPM) or Power Distribution Center (PDC).
Turn ignition off. Disconnect jumper wire. Measure resistance between ground and each terminal at IAC motor harness connector. If resistance is 5 ohms or more at each terminal, go to next step. If resistance is less than 5 ohms at any terminal, repair short to ground in appropriate circuit between PCM and IAC motor. See WIRING DIAGRAMS article.
Ensure ignition is off. Ensure IAC motor is disconnected. Reconnect PCM connectors. Start engine and allow it to idle. Using a test light connected to ground, probe each terminal at IAC motor harness connector for 10 seconds. If test light flashes on and off for each terminal, replace IAC motor. If test light does not flash on and off for each terminal, replace PCM. Program the new PCM. See PROGRAMMING .
At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, test is complete.