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 is output	A
   P050A and other DTCs are output	B

   HINT: 

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

B → See step   20 

A: 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. Start the engine.
3. Turn the Techstream on.
4. 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.
5. Read the values displayed on the Techstream while the engine is idling.
6. 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

   Standard

   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   5 

OK: Go to next step 

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

   OK

   No deposits around throttle valve and throttle valve moves smoothly.

OK → See step   14 

NG → See step   4 

1. Repair or replace throttle with motor body assembly. Refer to REMOVAL .

NEXT → See step   14 

1. Check the PCV hose connections. Refer to COMPONENTS .

   OK

   PCV valve and hose are connected correctly and are not damaged.

NG → See step   10 

OK: Go to next step 

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. Operate the VVT system through the Active test, and check if the VVT system is operating normally.
   1. Perform the Active Test, referring to DTC P0011 inspection procedure (VVT system for intake camshaft). Refer to PROCEDURE - Step 2 .
   2. Perform the Active Test, referring to DTC P0014 inspection procedure (VVT system for exhaust camshaft). Refer to PROCEDURE - Step 2 .

NG → See step   13 

OK: Go to next step 

OK → See step   14 

NG → See step   15 

1. Repair or replace PCV valve or hose.

NEXT → See step   14 

1. Repair or replace intake system. Refer to ON-VEHICLE INSPECTION .

NEXT → See step   14 

1. Replace air cleaner filter element sub-assembly.

NEXT → See step   14 

1. Check and repair VVT system.

   HINT: 

   • Refer to DTC P0011 Inspection Procedure (VVT system for intake camshaft). Refer to INSPECTION PROCEDURE .
   • Refer to DTC P0014 Inspection Procedure (VVT system for exhaust camshaft). Refer to INSPECTION PROCEDURE .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch off and wait for at least 30 seconds.
6. Turn the ignition switch to ON and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
8. Check that the engine coolant temperature is between -10°C and 50°C (14 and 122°F).
9. Start the engine and warm it up.
10. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P050A.
13. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    NORMAL (DTC is not output)	A
    ABNORMAL (DTC P050A is output)	B

B → See step   15 

A → See step   21 

1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

   HINT: 

   Repair any problems.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch off.
6. Turn the ignition switch to ON and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
8. Check that the engine coolant temperature is between -10°C and 50°C (14 and 122°F).
9. Start the engine and warm it up.
10. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P050A.
13. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    NORMAL (DTC is not output)	A
    ABNORMAL (DTC P050A is output)	B

B → See step   17 

A → END 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   HINT: 

   If the result of the inspection performed in step 9 indicated no problem, proceed to the next step without replacing the mass air flow meter assembly.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch off.
6. Turn the ignition switch to ON and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
8. Check that the engine coolant temperature is between -10°C and 50°C (14 and 122°F).
9. Start the engine and warm it up.
10. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P050A.
13. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    NORMAL (DTC is not output)	A
    ABNORMAL (DTC P050A is output)	B

B → See step   22 

A → END