DTC P050A: Cold Start Idle Air Control System Performance [04/2013 - 10/2017]: 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.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

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.

Result:

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [04/2013 - 06/2014] , or refer to DIAGNOSTIC TROUBLE CODE CHART [06/2014 - 08/2015] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 10/2016] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2016 - 10/2017]

Result:

See step 2

READ VALUE USING TECHSTREAM (FUEL TRIM)

HINT:

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

Connect the Techstream to the DLC3.
Start the engine.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Gas AF Control / Short FT #1, Long FT #1, Short FT #2 and Long FT #2.

Powertrain > Engine > Data List

Tester Display
Short FT #1
Long FT #1
Short FT #2
Long FT #2

Read the values displayed on the Techstream at engine idle.

Add together the Short FT #1 and Long FT #1 values, and the Short FT #2 and Long FT #2 values to obtain the total fuel trim.

Standard

The total of the Short FT #1 and Long FT #1 values, and the total of the Short FT #2 and Long FT #2 values is between -20% and 20%.

Result

Proceed to
OK
NG

Result:

See step 6

Result:

See step 3

INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE)

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

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

Result

Proceed to
OK
NG

Result:

See step 5

Result:

See step 4

CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)

NOTE:

In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [04/2013 - 10/2017]

Powertrain > Engine > Clear DTCs
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the Techstream on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

Powertrain > Engine > Data List

Tester Display
Coolant Temp

Check that the engine coolant temperature is between -10 and 60°C (14 and 140°F).
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.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

Input the DTC: P050A.

Check the DTC judgment result.

Result

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

Result:

CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [04/2013 - 10/2017]

Result:

See step 14

REPAIR OR REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

Repair or replace the throttle body with motor assembly.

Refer to REMOVAL [04/2013 - 08/2015] , or refer to REMOVAL [08/2015 - 10/2017]

HINT:

Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

Refer to INITIALIZATION [04/2013 - 10/2017]

Result

Proceed to
NEXT

Result:

See step 12

CHECK PCV SYSTEM

Check the PCV hose connections.

Refer to COMPONENTS [04/2013 - 10/2017]

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

Result

Proceed to
OK
NG

Result:

See step 20

Result:

See step 7

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Refer to ON-VEHICLE INSPECTION [04/2013 - 08/2015] , or refer to ON-VEHICLE INSPECTION [08/2015 - 10/2017]

No leaks from intake system.

Result

Proceed to
OK
NG

Result:

See step 19

Result:

See step 8

CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.

The air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.

Result

Proceed to
OK
NG

Result:

See step 13

Result:

See step 9

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR)

Operate the VVT system through the Active Test, and check if the VVT system is operating normally.

Perform the Active Test, referring to DTC P0011 Procedure (VVT system for intake camshaft).
Refer to PROCEDURE - Step 2
Perform the Active Test, referring to DTC P0014 Procedure (VVT system for exhaust camshaft).
Refer to PROCEDURE - Step 2

Result

Proceed to
OK
NG

Result:

See step 11

Result:

See step 10

READ VALUE USING TECHSTREAM (MAF)
Refer to PROCEDURE - Step 15

Result

Proceed to

OK

NG

Result:

OK

See step 4

Result:

NG

See step 14

CHECK AND REPAIR VVT SYSTEM

Check and repair the VVT system.

HINT:

Refer to DTC P0011 Procedure (VVT system for intake camshaft).
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); DTC P0021: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2); DTC P0022: Camshaft Position "A" - Timing Over-Retarded (Bank 2) [04/2013 - 10/2017]
Refer to DTC P0014 Procedure (VVT system for exhaust camshaft).
Refer to DTC P0014: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1); DTC P0015: Camshaft Position "B" - Timing Over-Retarded (Bank 1); DTC P0024: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 2); DTC P0025: Camshaft Position "B" - Timing Over-Retarded (Bank 2) [04/2013 - 10/2017]

Result

Proceed to
NEXT

Result:

See step 12

CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)

NOTE:

In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [04/2013 - 10/2017]

Powertrain > Engine > Clear DTCs
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the Techstream on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

Powertrain > Engine > Data List

Tester Display
Coolant Temp

Check that the engine coolant temperature is between -10 and 60°C (14 and 140°F).
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.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

Input the DTC: P050A.

Check the DTC judgment result.

Result

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

Result:

END

Result:

See step 14

REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

Replace the air cleaner filter element sub-assembly.

Result

Proceed to
NEXT

Result:

See step 12

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

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 [04/2013 - ]

HINT:

Repair any problems.

Result

Proceed to
NEXT

Result:

See step 15

CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)

NOTE:

In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [04/2013 - 10/2017]

Powertrain > Engine > Clear DTCs
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the Techstream on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

Powertrain > Engine > Data List

Tester Display
Coolant Temp

Check that the engine coolant temperature is between -10 and 60°C (14 and 140°F).
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.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

Input the DTC: P050A.

Check the DTC judgment result.

Result

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

Result:

END

Result:

See step 16

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
Refer to PROCEDURE - Step 3 [04/2013 - 06/2014] , or refer to PROCEDURE - Step 3 [06/2014 - 10/2017]

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

OK

See step 17

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

Replace the mass air flow meter sub-assembly.

Refer to REMOVAL [04/2013 - 10/2017]

HINT:

If the result of the inspection performed in step 10 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 [04/2013 - 10/2017]

Result

Proceed to
NEXT

Result:

See step 18

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

HINT:

In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [04/2013 - 10/2017]

Powertrain > Engine > Clear DTCs
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the Techstream on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

Powertrain > Engine > Data List

Tester Display
Coolant Temp

Check that the engine coolant temperature is between -10 and 60°C (14 and 140°F).
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.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

Input the DTC: P050A.

Check the DTC judgment result.

Result

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

Result:

END

Result:

REPLACE ECM. Refer to REMOVAL [04/2013 - 10/2017]

REPAIR OR REPLACE INTAKE SYSTEM

Repair or replace the intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Refer to INITIALIZATION [04/2013 - 10/2017]

Result

Proceed to
NEXT

Result:

See step 12

REPAIR OR REPLACE PCV HOSE

Repair or replace PCV valve or hose.

Result

Proceed to
NEXT

Result:

See step 12