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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read DTCs.

   Result

   Result	Proceed to
   P050A	A
   P050A and other DTCs	B

   HINT: 

   If any DTCs other than P050A are output, troubleshoot those DTCs first.

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 ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Short FT #1 and Long FT #1.
5. Read the values displayed on the tester.
6. Add together the Short FT #1 and Long FT #1 values to obtain the total Fuel Trim.

   Standard

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

NG → See step   5 

OK: Go to next step 

1. Check that there are no deposits around the throttle valve.

   OK

   No deposits around the throttle valve.

NG → See step   10 

OK: Go to next step 

1. Replace ECM. Refer to REMOVAL .

NEXT → See step   15 

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the Techstream on.
4. Turn the air conditioning switch to ON.
5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).
6. Check the engine speed while operating the OCV using the tester.

   OK

   Tester Operation	Specified Condition
   OCV OFF	Normal engine speed
   OCV ON	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

   HINT: 

   If the result is not acceptable, cool the engine and perform the Active Test again.

7. Start the engine when the engine coolant temperature is 30 °C or less.
8. Turn the Techstream on.
9. Turn the air conditioning switch to ON.
10. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).
11. Check the engine speed while operating the OCV using the tester with the engine coolant temperature is 50 °C or less.

    OK

    Tester Operation	Specified Condition
    OCV OFF	Normal engine speed
    OCV ON	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

NG → See step   11 

OK: Go to next step 

1. Start the engine.
2. Pinch the positive crankcase ventilation (PCV) hose.
3. Check the engine rpm.

   OK

   The engine rpm rises when the PCV hose is pinched.

NG → See step   12 

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   13 

OK: Go to next step 

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

   OK

   No leakage from the air induction system.

NG → See step   14 

OK: Go to next step 

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

NEXT → See step   15 

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

NEXT → See step   15 

HINT: 

Refer to DTC P0011 Inspection Procedure. Refer to INSPECTION PROCEDURE

NEXT → See step   15 

NEXT → See step   15 

NEXT → See step   15 

NEXT → See step   15 

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

NEXT → END