DTC P050A: Cold Start Idle Air Control System Performance [08/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.
   RESULT
   
   

   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 → See step   27 

A: Go to next step 

HINT: 

Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter sub-assembly.

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [08/2014 - ] .
5. Start the engine.
6. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas AF Control / Short FT #1 and Long FT #1.
7. Read the values displayed on the Techstream at engine idle.
8. Add together the Short FT #1 and Long FT #1 values to obtain the total fuel trim.

   Standard

   Total of Short FT #1 and Long FT #1 values is between -20% and 20%.

NG → See step   7 

OK: Go to next step 

1. Check that there are no deposits around the throttle valve and throttle valve condition.

   OK

   No deposits around the throttle valve and throttle valve moves smoothly.

NG → See step   6 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [08/2014 - ] .
5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

   HINT: 

   The A/C switch and all accessory switches should be off.

6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / Throttle Idle Position and MAP.
7. Confirm that the Throttle Idle Position is ON and check the MAP value in the Data List while performing the Active Test.

   HINT: 

   • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
   • Be sure to return the EGR valve to step 0 when the Active Test is completed.
   • Do not open the EGR valve 30 steps or more during the Active Test.

   OK

   MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.

   Standard

   -	EGR Step Position (Active Test)
   	0 Steps	0 to 30 Steps
   MAP (Data List)	(EGR valve is fully closed)	MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

   HINT: 

   • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.
   • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.
   RESULT
   
   

   Result	Proceed to
   Outside of standard range	A
   Within standard range	B

B → See step   20 

A: Go to next step 

1. Remove the EGR valve assembly. Refer to REMOVAL [08/2014 - ] .
2. Check if the EGR valve is stuck open.

   OK

   EGR valve is tightly closed.

OK → See step   20 

NG → See step   17 

1. Repair or replace the throttle body assembly. Refer to REMOVAL [08/2014 - ] .

   HINT: 

   Perform "Inspection After Repair" after repairing or replacing the throttle body assembly. Refer to INITIALIZATION [08/2014 - ] .

NEXT → See step   19 

1. Check the PCV hose connections. Refer to COMPONENTS [08/2014 - ] .

   OK

   PCV valve and hose are connected correctly and are not damaged.

NG → See step   14 

OK: Go to next step 

1. Check the intake system for vacuum leaks. Refer to ON-VEHICLE INSPECTION [08/2014 - ] .

   OK

   No leaks from the intake system.

NG → See step   15 

OK: Go to next step 

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 → See step   16 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [08/2014 - ] .
5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

   HINT: 

   The A/C switch and all accessory switches should be off.

6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / Throttle Idle Position and MAP.
7. Confirm that the Throttle Idle Position is ON and check the MAP value in the Data List while performing the Active Test.

   HINT: 

   • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
   • Be sure to return the EGR valve to step 0 when the Active Test is completed.
   • Do not open the EGR valve 30 steps or more during the Active Test.

   OK

   MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.

   Standard

   -	EGR Step Position (Active Test)
   	0 Steps	0 to 30 Steps
   MAP (Data List)	(EGR valve is fully closed)	MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

   HINT: 

   • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.
   • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.
   RESULT
   
   

   Result	Proceed to
   Outside of standard range	A
   Within standard range	B

B → See step   12 

A: Go to next step 

1. Remove the EGR valve assembly. Refer to REMOVAL [08/2014 - ] .
2. Check if the EGR valve is stuck open.

   OK

   EGR valve is tightly closed.

NG → See step   17 

OK: Go to next step 

1. Operate the VVT system through the Active test, and check if the VVT system is operating normally.
   1. Perform the Active Test, referring to DTC P0011 Inspection Procedure. Refer to PROCEDURE - Step 2 .

NG → See step   18 

OK: Go to next step 

OK → See step   20 

NG → See step   21 

1. Repair or replace the PCV valve or hose.

NEXT → See step   19 

1. Repair or replace the intake system.

   HINT: 

   Perform "Inspection After Repair" after repairing or replacing the intake system. Refer to INITIALIZATION [08/2014 - ] .

NEXT → See step   19 

1. Replace the air cleaner filter element sub-assembly.

NEXT → See step   19 

1. Replace the EGR valve assembly. Refer to REMOVAL [08/2014 - ] .

   HINT: 

   Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to INITIALIZATION [08/2014 - ] .

NEXT → See step   19 

1. Check and repair the VVT system.

   HINT: 

   Refer to DTC P0011 Inspection Procedure. Refer to DTC P0011: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1); DTC P0012: Camshaft Position "A" - Timing Over-Retarded (Bank 1) [08/2014 - ] .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2014 - ] .
5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the power switch on (IG).
7. Turn the Techstream on.
8. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
9. Check that the engine coolant temperature is between -10 and 65°C (14 and 149°F).
10. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [08/2014 - ] .
11. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
12. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P050A.
15. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    NORMAL (DTC is not output)	A
    ABNORMAL (DTC P050A is output)	B

B → See step   21 

A → END 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2014 - ] .
5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the power switch on (IG).
7. Turn the Techstream on.
8. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
9. Check that the engine coolant temperature is between -10 and 65°C (14 and 149°F).
10. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [08/2014 - ] .
11. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
12. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P050A.
15. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    NORMAL (DTC is not output)	A
    ABNORMAL (DTC P050A is output)	B

B → See step   21 

A → See step   28 

1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [08/2014 - ] .

   HINT: 

   Repair any problems.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2014 - ] .
5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the power switch on (IG).
7. Turn the Techstream on.
8. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
9. Check that the engine coolant temperature is between -10 and 65°C (14 and 149°F).
10. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [08/2014 - ] .
11. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
12. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P050A.
15. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    ABNORMAL (DTC P050A is output)	A
    NORMAL (DTC is not output)	B

B → END 

A: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the mass air flow meter sub-assembly. Refer to REMOVAL [08/2014 - ] .

   HINT: 

   • If the results of the inspections performed in step 13 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
   • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly. Refer to INITIALIZATION [08/2014 - ] .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2014 - ] .
5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the power switch on (IG).
7. Turn the Techstream on.
8. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
9. Check that the engine coolant temperature is between -10 and 65°C (14 and 149°F).
10. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [08/2014 - ] .
11. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
12. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P050A.
15. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    NORMAL (DTC is not output)	A
    ABNORMAL (DTC P050A is output)	B

B → See step   26 

A → END