Inspection Procedure

HINT:

• DTC P050B may be set when the engine shows the symptom as listed below If necessary, check the trouble areas as listed below
  INSPECTION PROCEDURE CHART
  
  

  Symptoms	Factor	Trouble Area
  Low idle speed at engine cold	Excessive engine friction	Engine oil deterioration Drive belt tension A/C compressor Generator P/S pump
  Rough idle at engine cold	Abnormal combustion	Fuel quality

• Read freeze frame data using the Techstream The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B) 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG)
   3. Turn the Techstream ON
   4. Enter the following menus. Powertrain / Engine / Trouble Codes.
   5. Read the DTCs

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      DTC P050B is output	A
      DTC P050B and other DTCs are output	B

      HINT.

      If any DTCs other than P050B are output, troubleshoot those DTCs first

   B: GO TO DTC CHART  (See DIAGNOSTIC TROUBLE CODE CHART )

   A: Go to next step 

2. READ VALUE USING TECHSTREAM (FUEL TRIM) 

   HINT

   Calculate the total fuel trim values to check the characteristic deviation of the mass airflow meter

   1. Connect the Techstream to the DLC3.
   2. Start the engine
   3. Turn the Techstream ON
   4. Enter the following menus. Powertrain / Engine / 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 at engine idle
   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.

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

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      NG	A
      OK	B

   B: Go to step  12

   A: Go to next step 

3. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE MD VVT LINEAR) 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG) and turn the Techstream ON
   3. Start the engine and warm it up
   4. Enter the following menus Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2) / VVT-iE Aim Angle (Bank 1) and MD VVT Change Angle (Bank 1) or VVT-iE Aim Angle (Bank 2) and VVT-iE Change Angle (Bank 2)
   5. Perform the Active Test operation with the engine speed at 1500 rpm.

      OK 

      ACTIVE TEST
      
      

      Active Test Movement Order	Difference between "VVT-iE Aim Angle" and "VVT Change Angle"
      0 deg → 10 deg → 20 deg → 40 deg → 10 deg → 0 deg → 10 deg → END	Within 4 DegFR

   NG: Go to step  8

   OK: Go to next step 

4. CHECK PCV HOSE CONNECTIONS 
   1. Inspect the PCV hose connections (See ON-VEHICLE INSPECTION ).

      OK: PCV hose is connected correctly and is not damaged. 

   NG: Go to step  9

   OK: Go to next step 

5. CHECK INTAKE SYSTEM 
   1. Check the intake system for vacuum leaks (See ON-VEHICLE INSPECTION ).

      OK: No leaks from intake system. 

   NG: Go to step  10

   OK: Go to next step 

6. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
   1. Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil

      OK: Air cleaner filter element is not excessively contaminated with dirt or oil. 

   NG: Go to step  11

   OK: Go to next step 

7. REPLACE MASS AIR FLOW METER 
   1. Replace the mass air flow meter (See REMOVAL ).

   NEXT: Go to step  15

8. CHECK AND REPAIR VVT SENSOR 
   1. Check and repair VVT system

   NEXT: Go to step  15

9. REPAIR OR REPLACE PCV HOSE 
   1. Repair or replace PCV hose (See REMOVAL ).

   NEXT: Go to step  15

10. REPAIR OR REPLACE INTAKE SYSTEM 
    1. Repair or replace intake system (See REMOVAL )

    NEXT: Go to step  15

11. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Replace the air cleaner filter element sub-assembly.

    NEXT: Go to step  15

12. CHECK THROTTLE VALVE 
    1. Check for deposits around the throttle valve and throttle valve condition

       OK: No deposits around throttle valve and throttle valve moves smoothly. 

    NG: Go to step  14

    OK: Go to next step 

13. REPLACE ECM 
    1. Replace the ECM (See REMOVAL )

    NEXT: Go to step  15

14. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY 
    1. Repair or replace the throttle body assembly.
15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B) 
    NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG)
    3. Turn the Techstream ON.
    4. Clear DTCs (See DTC CHECK/CLEAR ).
    5. Switch the ECM from normal mode to check mode using the Techstream (See CHECK MODE PROCEDURE ).
    6. Start the engine to idle for a minute.

       OK: Stable fast idle. 

    7. Read the DTCs

       OK: No DTC outputs. 

    NEXT: END