DTC P050A: Cold Start Idle Air Control System Performance: Procedure

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

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Select the following menu items: Powertrain / Engine / Trouble Code.

Read the DTCs.

Result

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

HINT:

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

B → See step 16

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 engine switch on (IG).
3. Turn the Techstream on.
4. Select the following menu items: Powertrain / Engine / Data List / 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 %.
OK → See step 12

NG: Go to next step

PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)

Connect the Techstream to the DLC3.
Start the engine and turn the Techstream ON.
Warm up the engine.
Select the following menu items: Powertrain / Engine / 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 Techstream.

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 → See step 8

OK: Go to next step

CHECK PCV HOSE CONNECTIONS
OK

PCV hose is connected correctly and is not damaged.

NG → See 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 → See 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 → See step 11

OK: Go to next step
REPLACE MASS AIR FLOW METER
1. Replace the mass air flow meter. Refer to REMOVAL .
NEXT → See step 15
CHECK AND REPAIR VVT SYSTEM
NEXT → See step 15
REPAIR OR REPLACE PCV HOSE
NEXT → See step 15
REPAIR OR REPLACE AIR INDUCTION SYSTEM
NEXT → See step 15
REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
NEXT → See 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 → See step 14

OK: Go to next step
REPLACE ECM
1. Replace the ECM. Refer to REMOVAL .
NEXT → See step 15
REPAIR OR REPLACE THROTTLE BODY ASSEMBLY
NEXT → See step 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 engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Switch the ECM from normal mode to check mode using the Techstream. Refer to 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
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART