DTC P050A

DTC P050A  : Cold Start Idle Air Control System Performance Problem

DTC (PGM-FI)

1. PGM-FI system check

   -1. Turn the vehicle to the ON mode.

   -2. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame

   Are any Pending or Confirmed DTCs other than P050A indicated?

   YES 

   Go to the indicated DTC's troubleshooting.

   NO 

   Go to step 2.

2. Intake air duct visual check

   -1. Check for a poor connection or blockage at the intake air duct.

   Is it OK?

   YES 

   Go to step 3.

   NO 

   Reconnect or repair the intake air duct, then do the repair verification.

3. Air cleaner housing visual check

   -1. Check for a poor connection or blockage at the air cleaner housing.

   Is it OK?

   YES 

   Go to step 4.

   NO 

   Replace the air cleaner housing , then do the repair verification.

4. Air cleaner element visual check

   -1. Check for dirt or debris on the air cleaner element.

   Is it dirty?

   YES 

   Replace the air cleaner element , then do the repair verification.

   NO 

   Go to step 5.

5. Problem verification

   -1. Let the engine cool until the value of ECT SENSOR 1 is 122 deg.F (50 deg.C) or less.

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1

   -2. Clear the DTC with the HDS.

   -3. Start the engine, and let it idle for 10 seconds or more.

   -4. Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS.

   DTC Description	OBD STATUS
   P050A Cold Start Idle Air Control System Performance Problem

   Does the HDS indicate FAILED?

   YES 

   The failure is duplicated. Go to step 6.

   NO 

   If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 5-1 and recheck.

6. Throttle body test

   -1. Select the ETCS TEST in the INSPECTION MENU with the HDS.

   ETCS TEST

   Is the THROTTLE ACTUATOR CONTROL VALVE normal?

   YES 

   Go to step 7.

   NO 

   Replace the throttle body , then do the repair verification.

7. MAF sensor performance check

   -1. Start the engine. Hold the engine speed at 3000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.

   -2. While holding the engine speed at 2500 RPM for 30 seconds, check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   MAF SENSOR	10.6-12.9	g/s

   Do the current condition(s) match the malfunction threshold?

   YES 

   The MAF sensor is OK. Go to step 8.

   NO 

   Replace the MAF sensor/IAT sensor , then do the repair verification.

8. IAT sensor performance check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Allow the engine to cool to ambient temperature.

   -3. Note the ambient temperature.

   -4. Turn the vehicle to the ON mode.

   -5. Quickly note the value of the IAT SENSOR in the DATA LIST with the HDS.

   Signal	Current conditions
   	Values	Unit
   IAT SENSOR (2)

   -6. Compare the value of the IAT SENSOR with the ambient temperature.

   Does the value of the IAT SENSOR differ 5.4 deg.F (3 deg.C) or more from the ambient temperature?

   YES 

   Replace the MAF sensor/IAT sensor , then do the repair verification.

   NO 

   The IAT sensor is OK. Check for dirt, carbon, or damage in the throttle bore. If there is dirt or carbon, clean the throttle body , then do the repair verification. If there is damage in the throttle bore, replace the throttle body , then do the repair verification.

9. Repair verification (OBD STATUS check)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Reconnect all connectors.

   -3. Turn the vehicle to the ON mode.

   -4. Reset the PCM with the HDS .

   Reset PCM

   -5. Do the PCM idle learn procedure .

   -6. Let the engine cool until the value of ECT SENSOR 1 is 122 deg.F (50 deg.C) or less.

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1

   -7. Start the engine, and let it idle for 10 seconds or more.

   -8. Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS.

   DTC Description	OBD STATUS
   P050A Cold Start Idle Air Control System Performance Problem

   DTC (PGM-FI)

   Does the HDS indicate PASSED, FAILED, EXECUTING, or OUT OF CONDITION?

   PASSED

   Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.

   FAILED

   Go to step 1 and recheck.

   EXECUTING

   Keep idling until a result comes on.

   OUT OF CONDITION

   Meet the test conditions, and check the OBD STATUS again.