DTC P050A: Cold Start Idle Air Control System Performance; DTC P050B: Cold Start Ignition Timing Performance: Procedure

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

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Result

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 → 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. Enter the following menus: Powertrain / Engine / 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 Techstream.
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%.
OK → See step 12

NG: Go to next step

PERFORM ACTIVE TEST USING TECHSTREAM (VVT-iE SYSTEM)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream on.
Start the engine and warm it up.
Engine is idling.
Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank1) or Control the VVT-iE Linear (Bank2) / All Data / VVT-iE Aim Angle #1 and VVT Change Angle #1 or VVT-iE Aim Angle #2 and VVT Change Angle #2.

Perform the Active Test operation with the engine speed at 1500 rpm.

Active Test Movement Order	Difference between "VVT-iE Aim Angle" and "VVT Change Angle"
0 deg → 10 deg → 20 deg → 40 deg → 10 deg → 0 deg → 10 deg → END	Within 4 DegFR

NG → See step 8

OK: Go to next step

CHECK VENTILATION HOSE CONNECTIONS
OK

Ventilation 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 toREMOVAL .
NEXT → See step 15
CHECK AND REPAIR VVT-iE SYSTEM
1. Check and repair the VVT-iE system. Refer toDISASSEMBLY .
NEXT → See step 15
REPAIR OR REPLACE VENTILATION HOSE
1. Repair or replace the ventilation hose. Refer toON-VEHICLE INSPECTION .
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 toREMOVAL .
NEXT → See step 15
REPAIR OR REPLACE THROTTLE BODY ASSEMBLY
1. Repair or replace the throttle body assembly. Refer toREMOVAL .
NEXT: Go to next step
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 Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear DTCs. Refer toDTC CHECK / CLEAR .
5. Switch the ECM from normal mode to check mode using the Techstream. Refer toCHECK MODE PROCEDURE .
6. Start the engine to idle for a minute.
  OK
  
  Stable fast idling.
7. Read DTCs.
  OK
  
  No DTC output.
NEXT → END
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART