DTC P050A: Cold Start Idle Air Control Performance
WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2010 Mercury Mountaineer, 2010 Mercury Milan, 2010 Mercury Mariner, 2010 Mercury Grand Marquis, and 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
DTC P050A: COLD START IDLE AIR CONTROL PERFORMANCE
| For Vehicles With An Idle Air Control (IAC) Valve | |||
| Description: | The cold start emission reduction monitor has detected an airflow performance deficiency. The cold start emission reduction monitor validates the operation of the components of the system required to achieve the cold start emission reduction strategy, retarded spark timing (P050B) and elevated idle airflow (P050A). When the idle airflow test portion of the cold start emission reduction strategy is enabled, the idle air control system requests a higher idle RPM to increase the engine airflow. The cold start emission reduction monitor compares the actual airflow measured by the mass air flow (MAF) sensor to the requested powertrain control module (PCM) airflow. The DTC sets when the airflow is less than the calibrated limit. | ||
| Possible Causes: |
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| Diagnostic Aids: | This DTC is an informational DTC and may be accompanied by other DTCs. Diagnose other DTCs first. If no other DTCs are present, inspect the intake air system for air restrictions and damage. If no concerns are present, clear the DTCs and repeat the self-test. The cold start emission reduction monitor runs during a cold start. Before repeating the self-test, a 2 to 3 hour soak period is required for the cold start emission reduction monitor to run at start up. |
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| For All Others | |||
| Description: | The monitor compares the actual measured engine speed to the engine speed requested by the powertrain control module (PCM). When the difference between desired and actual engine speed exceeds the calibrated threshold, the DTC sets. | ||
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| Diagnostic Aids: | Disregard the freeze frame data. Freeze frame data does not apply to the cold start monitor. This DTC is informational only and may be accompanied by other DTCs. Diagnose other DTCs first. If no other DTCs are present, inspect the intake air system for air restrictions, vacuum leaks, and damage. If no concerns are present, clear the DTCs and verify the engine coolant temperature (ECT) is below 37.8° C (100°F). Allow the vehicle to soak for 2-3 hours if necessary for the ECT to fall below 37.8° C (100°F). Start the engine without touching the accelerator pedal and allow the engine to idle for 6 minutes in park. If no DTCs are present and the malfunction indicator lamp (MIL) is not illuminated after idling for 6 minutes, carry out the key on engine running KOER self-test to confirm that no DTCs are present and the repair is complete. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Ranger | Refer to the Description, Possible Causes and Diagnostic Aids for the appropriate DTC. | ||
| All others | Refer to the Description, Possible Causes and Diagnostic Aids for the appropriate DTC. | ||