DTC P050A: Cold Start Idle Air Control System Performance: Procedure

OK

Any other DTCs are not output.

NG → See step   16 

OK: Go to next step 

HINT: 

Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter.

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine and ECT / Data List / Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2.
4. Read the values displayed on the Techstream.
5. Add together the Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values to obtain the total fuel trim.

   Result

   Total of Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values is between -20% and 20%.

NG → See step   4 

OK: Go to next step 

1. Check for deposits around the throttle valve and throttle valve condition.

   OK

   No deposits around throttle valve and throttle valve moves smoothly.

OK → See step   9 

NG → See step   8 

1. Allow the engine to idle after the engine is warmed up.
2. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).
3. Turn on Control the VVT System (Bank 1) or Control the VVT System (Bank 2) to advance the valve timing.
4. Check the engine condition.

   OK

   The engine stalls or idles roughly when Control the VVT System is ON (VVT system is OK).

NG → See step   10 

OK: Go to next step 

1. Allow the engine to idle.
2. Pinch the positive crankcase ventilation (PCV) hose.
3. Check the engine speed.

   OK

   The engine speed rises when the PCV hose is pinched.

NG → See step   11 

OK: Go to next step 

1. Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil.

   OK

   The air cleaner filter element is not excessively contaminated with dirt or oil.

NG → See step   12 

OK: Go to next step 

1. Check the air induction system for vacuum leakage. Refer to ON-VEHICLE INSPECTION - Step 4 .

OK → See step   14 

NG → See step   13 

1. Repair or replace the throttle body. Refer to REMOVAL .

NEXT → See step   15 

1. Replace the ECM. Refer to REMOVAL .

NEXT → See step   15 

NEXT → See step   15 

NEXT → See step   15 

NEXT → See step   15 

NEXT → See step   15 

1. Replace the mass air flow meter. Refer to REMOVAL .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Turn the engine switch off.
6. Turn the engine switch on (IG) and turn the Techstream on.
7. Start the engine and warm it up.
8. Refer to the confirmation driving pattern.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P050A.
11. Check the DTC judgment result.
    RESULT
    
    

    Tester Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

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