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Home >> Ford >> 2011 >> Focus S, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions - DTC P0218 Through DTC P0581 - (Except Diesel & Hybrid) >> DTC P050A: Cold Start Idle Air Control Performance

DTC P050A: Cold Start Idle Air Control Performance

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 airflow (MAF) sensor to the requested powertrain control module (PCM) airflow. This DTC sets when the airflow is less than the calibrated limit.
Possible Causes: 
  • Damaged intake air system tubes
  • Restricted air filter
  • Restricted or blocked idle air control or intake passages
  • Air or vacuum leaks
  • Base engine problem
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.
For All Others 
Description:  The monitor compares the actual measured engine speed to the engine speed requested by the powertrain control module (PCM). This DTC sets when the difference between desired and actual engine speed exceeds the calibrated threshold.
Possible Causes: 
  • Intake air restriction
  • Exhaust restriction
  • Engine mechanical concern
  • Damaged or sludged electronic throttle body (ETB)
  • Vacuum leaks
  • Damaged PCM
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 is below 37.8°C (100°F). Allow the vehicle to soak for 2-3 hours if necessary for the engine coolant temperature 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.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Ranger Refer to the Description, Possible Causes and Diagnostic Aids for the DTC in table.
All others Refer to the Description, Possible Causes and Diagnostic Aids for the DTC in table.
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