Inspection Procedure

HINT:

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 moving or stationary, 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 P050A) 
   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 CHART
      
      

      Result	Proceed to
      P050A	A
      P050A and other DTCs	B

      HINT:

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

      NG: GO TO DTC CHART (See )

      OK: 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 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 / A/F Control System / Short FT #1 and Long FT#1.
   5. Read the values displayed on the Techstream.
   6. Add together the Short FT #1 and Long FT #1 values to obtain the total Fuel Trim.

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

      NG: Go to step  5

      OK: Go to Next Step 

3. INSPECT THROTTLE BODY 
   1. Check that there are no deposits around the throttle valve.

      OK: No deposits around the throttle valve. 

      NG: Go to step  10

      OK: Go to Next Step 

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

      NEXT: Go to step  15

5. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV) 
   1. Connect the Techstream to the DLC3.
   2. Start the engine.
   3. Turn the Techstream on.
   4. Warm up the engine.
   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 Oil Control Valve (OCV) using the Techstream.

      OK 

      TESTER OPERATION SPECIFIED CONDITION CHART
      
      

      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: Go to step  11

      OK: Go to Next Step 

6. CHECK PCV SYSTEM 
   1. Start the engine.
   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: Go to step  12

      OK: Go to Next Step 

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

      NG: Go to step  13

      OK: Go to Next Step 

8. CHECK AIR INDUCTION SYSTEM 
   1. Check the air induction system for vacuum leakage (See ON-VEHICLE INSPECTION ).

      OK: No leakage from the air induction system. 

      NG: Go to step  14

      OK: Go to Next Step 

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

      NEXT: Go to step  15

10. REPAIR OR REPLACE THROTTLE BODY 
    1. Repair or replace the throttle body (See REMOVAL ).

       NEXT: Go to step  15

11. CHECK AND REPAIR VVT SYSTEM 

    HINT:

    Refer to DTC P0011 INSPECTION PROCEDURE (See ).

    NEXT: Go to step  15

12. REPAIR OR REPLACE PCV SYSTEM 

    NEXT: Go to step  15

13. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 

    NEXT: Go to step  15

14. REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    NEXT: Go to step 15 

15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) 
    NOTE: For this operation, the engine must be cold (the same temperature as the engine coolant temperature recorded in the freeze frame data).
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs (See DTC CHECK / CLEAR ).
    5. Start the engine and idle it for one minute.

       OK: Stable fast idle. 

    6. Enter the following menus: Powertrain / Engine and ECT / Trouble Code / Pending.
    7. Read pending DTCs.

       OK: No pending DTC is output. 

       NEXT: END