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 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 P050A) 
   1. Connect the Techstream to the DLC3.
   2. Turn the power switch on (IG).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   5. Read the DTCs.

   Result 

   RESULT REFERENCE
   
   

   Display (DTC Output)	Proceed to
   P050A	A
   P050A and other DTCs	B

   HINT: 

   If any DTCs other than P050A 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 air flow meter.

   1. Connect the Techstream to the DLC3.
   2. Put the engine in inspection mode.
   3. Start the engine.
   4. Turn the Techstream on.
   5. Enter the following menus: Powertrain / Engine and ECT / Data List / A/F Control System / Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2.
   6. Read the values displayed on the Techstream at engine idles.
   7. 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 REFERENCE
   
   

   Result	Proceed to
   NG	A
   OK	B

   B:  Go to step  12

   A: Go to Next Step 

3. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV) 
   1. Connect the Techstream to the DLC3.
   2. Put the engine in inspection mode.
   3. Start the engine and 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) or Control the VVT System (Bank 2).
   6. Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.

   OK 

   TESTER OPERATION AND SPECIFIED CONDITION
   
   

   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  8

   OK: Go to Next Step 

4. CHECK PCV HOSE CONNECTIONS 

   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 leakage (See ON-VEHICLE INSPECTION ).

      OK: 

      No leakage 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 ON-VEHICLE INSPECTION ).

   NEXT:  Go to step  15

8. CHECK AND REPAIR VVT SYSTEM 

   NEXT:  Go to step  15

9. REPAIR OR REPLACE PCV HOSE 

   NEXT:  Go to step  15

10. REPAIR OR REPLACE INTAKE SYSTEM 

    NEXT:  Go to step  15

11. REPLACE 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 

    NEXT:  Go to step  15

15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) 
    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 power switch on (IG).
    3. Turn the Techstream on.
    4. Clear the 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 idling. 

    7. Read the DTCs.

       OK: 

       No DTC output. 

       NEXT: END