DTC P050A: Cold Start Idle Air Control System Performance Problem

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS or How to Troubleshoot the CVT System(CVT) .

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.

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 .

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 .

   NO 

   Go to step 5.

5. Problem verification:

   - 1. Let the engine cool until the value of ECT SENSOR 1 is 122 °F (50 °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, MAF sensor/IAT sensor 1, and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot. 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 .

7. MAF sensor performance check:

   - 1. Start the engine.

   - 2. Hold the engine speed at 3, 000 rpm without load (CVT in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

   - 3. While holding the engine speed at 2, 500 rpm for 30 seconds, check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   MAF SENSOR	3.8-5.4 (M/T) / 3.9-5.5 (CVT)	g/s

   Do the current condition(s) match the threshold?

   YES 

   The MAF sensor is OK. Go to step 8.

   NO 

   Replace MAF sensor/IAT sensor 1 .

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 (1) in the DATA LIST with the HDS.

   Signal	Current conditions
   	Values	Unit
   IAT SENSOR (1)

   - 6. Compare the value of the IAT SENSOR (1) with the ambient temperature.

   Does the value of the IAT SENSOR (1) differ 5.4 °F (3 °C) or more from the ambient temperature?

   YES 

   Replace MAF sensor/IAT sensor 1 .

   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 . If there is damage in the throttle bore, replace the throttle body .