Inspection Procedure

HINT:

Read freeze frame data using a Techstream. Freeze frame data record the engine condition when malfunctions are detected. 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 a Techstream to the DLC3.
Turn the ignition switch ON.
Turn the tester ON.
Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.

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.

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

OK: 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 a Techstream to the DLC3.
2. Turn the ignition switch ON.
3. Turn the tester ON.
4. Select the following menu items: 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.
5. Read the values displayed on the tester.
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%.
NG: Go to step 5

OK: Go to Next Step
INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY
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 ECM (see REMOVAL ).
NEXT: Go to step 15

PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)

Connect a Techstream to the DLC3.
Start the engine and turn the tester ON.
Warm up the engine.
Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).

Check the engine speed while operating the Oil Control Valve (OCV) using the tester.

SPECIFIED CONDITIONS

Tester Operation	Specified Condition
OCV OFF	Normal engine speed
OCVON	Engine idles roughly or stalls (soon after OCV 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 positive crankcase PCV hose.
3. Check the engine rpm.
  OK: The engine rpm rises when the PCV hose is pinched.
NG: Go to step 12

OK: Go to Next Step
INSPECT 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 AIR INDUCTION SYSTEM
1. Check the air induction system for vacuum leaks.
  OK: No leak from the air induction system.
NG: Go to step 14

OK: Go to Next Step
REPLACE MASS AIR FLOW METER
1. Replace mass air flow meter (see REMOVAL ).
NEXT: Go to step 15
REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
1. Repair or replace throttle with motor body (see REMOVAL ).
NEXT:Go to step 15
CHECK AND REPAIR VVT SYSTEM
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 AIR INDUCTION SYSTEM
NEXT: Go to step 15
CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
NOTE: For this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).
1. Connect a Techstream to the DLC3.
2. Turn the ignition switch ON.
3. Turn the tester ON.
4. Clear the DTCs (see DTC CHECK/CLEAR ).
5. Switch the ECM from normal mode to check mode using the tester (see CHECK MODE PROCEDURE ).
6. Start the engine and idle it for one minute.
  OK: Stable fast idle
7. Read the DTCs.
  OK: No DTC is output.
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