DTC Troubleshooting: P050A
DTC P050A: Cold Start Idle Air Control System Performance Problem
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P050A Cold Start Idle Air Control System Performance Problem
      

1.
PGM-FI system check:

PGM-FI system check
?1.
Press the engine start/stop button to select 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:

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:

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
     
     
     
4.
Air cleaner element visual check:

Air cleaner element visual check
?1.
Check for dirt or debris on the air cleaner element.

Is it dirty?

     
YES
     
     
     
     
NO
     
     
     
Go to step 5.
5.
Problem verification:

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, 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:

Throttle body test
?1.
Select the ETCS TEST in the INSPECTION MENU with the HDS.

  

Is the THROTTLE ACTUATOR CONTROL VALVE normal?

     
YES
     
     
     
Go to step 7.
     
NO
     
     
     
7.
MAF sensor performance check:

MAF sensor performance check
?1.
Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?2.
While holding the engine speed at 2,500 rpm for 30 seconds, check the parameter(s) below with the HDS.
A/T
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
MAF SENSOR
10.6?12.9
g/s
    

M/T
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
MAF SENSOR
10.5?12.5
g/s
    

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

     
YES
     
     
     
The MAF sensor is OK. Go to step 8.
     
NO
     
     
     
8.
IAT sensor performance check:

IAT sensor performance check
?1.
Press the engine start/stop button to select the OFF mode.

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

?3.
Note the ambient temperature.

?4.
Press the engine start/stop button to select 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 °F (3 °C) or more from the ambient temperature?

     
YES
     
     
     
     
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.
Repair verification (OBD STATUS check):

?1.
Press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Press the engine start/stop button to select the ON mode.

?4.
Reset the PCM with the HDS.


?5.
Do the PCM idle learn procedure.

?6.
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
    

?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
  


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 condition, and check the OBD STATUS again.