Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. 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.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A AND/OR P050B)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position.
Turn the tester on.
Select the following the menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

Read the DTCs.

Result

RESULT CHART

Display (DTC Output)	Proceed to
P050A and/or P050B	A
P050A and/or P050B and other DTCs	B

HINT:

If any DTCs other than P050A and P050B are output, troubleshoot those DTCs first.

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

A: Go to Next Step

READ VALUE USING INTELLIGENT TESTER (FUEL TRIM)
HINT:

Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter.
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Turn the tester on.
4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / SHORT FT #1 and LONG FT #1.
5. Read the values displayed on the tester.
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%.
OK: Go to step 12

NG: Go to Next Step

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE OCV)

Connect the intelligent tester to the DLC3.
Start the engine and turn the tester on.
Warm up the engine.
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1.

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

ACTIVE TEST 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 8

OK: Go to Next Step

CHECK PCV HOSE CONNECTIONS
OK:

PCV hose is connected correctly and is not damaged.

NG: Go to step 9

OK: Go to Next Step
CHECK AIR INDUCTION SYSTEM
1. Check the air induction system for vacuum leakage.
  OK:
  
  No leakage from air induction system.
NG: Go to step 10

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:
  
  Air cleaner filter element is not excessively contaminated with dirt or oil.
NG: Go to step 11

OK: Go to Next Step
REPLACE MASS AIR FLOW METER
NEXT: Go to step 15
CHECK AND REPAIR VVT SYSTEM
NEXT: Go to step 15
REPAIR OR REPLACE PCV HOSE
NEXT: Go to step 15
REPAIR OR REPLACE AIR INDUCTION SYSTEM
NEXT: Go to step 15
REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
NEXT: Go to step 15
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
REPLACE ECM
NEXT: Go to step 15
REPAIR OR REPLACE THROTTLE BODY ASSEMBLY
NEXT: Go to step 15
CHECK WHETHER DTC OUTPUT RECURS (DTC P050A AND/OR 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 intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position.
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 to idle for a minute.
  OK:
  
  Stable fast idling.
7. Read the DTCs.
  OK:
  
  No DTC output.
NEXT: END