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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain/Engine/Trouble Codes.

Read the DTCs.

Result

RESULT CHART

Result	Proceed to
DTC P050A is output	A
DTC P050A and other DTCs are output	B

HINT:

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

B: GO TO DTC CHART

A: Go to next step

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/Data List/All Data/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
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
REPLACE ECM
1. Replace the ECM (See REMOVAL ).
  NEXT: Go to step 15

PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OIL CONTROL VALVE)

Connect the Techstream to the DLC3.
Start the engine.
Turn the Techstream on.
Enter the following menus: Powertrain/Engine/Active Test/Control the VVT System (Bank 1).

Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream.

TECHSTREAM OPERATION CHART

Techstream Operation	Specified Condition
OFF	Normal engine speed
ON	Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON)

NG: Go to step 11

OK: Go to next step

CHECK PCV SYSTEM
1. Start the engine.
2. Pinch the 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
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
CHECK INTAKE SYSTEM
1. Check the intake system for vacuum leakage (See ON-VEHICLE INSPECTION ).
  OK:
  
  No leakage from the intake system.
  
  NG: Go to step 14
  
  OK: Go to next step
REPLACE MASS AIR FLOW METER
1. Replace the mass air flow meter (See REMOVAL ).
  NEXT: Go to step 15
REPAIR OR REPLACE THROTTLE BODY
1. Repair or replace the throttle body (See REMOVAL ).
  NEXT: Go to step 15
CHECK AND REPAIR VVT SYSTEM
HINT:

Refer to DTC P0011 INSPECTION PROCEDURE .

NEXT: Go to step 15
REPAIR OR REPLACE PCV SYSTEM
NEXT: Go to step 15
REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
NEXT: Go to Step 15
REPAIR OR REPLACE INTAKE SYSTEM
NEXT: Go to step 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 the DTCs (See DTC CHECK/CLEAR ).
5. Start the engine and idle it for 1 minute.
  OK:
  
  Stable fast idle.
6. Enter the following menus: Powertrain/Engine/Trouble Codes/Pending.
7. Check for pending DTCs.
  OK:
  
  No pending DTC is output.
  
  NEXT: REPAIR COMPLETED