DTC P050A: Cold Start Idle Air Control System Performance [10/2015 - 12/2017]: Procedure

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

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

Read the DTCs.

Powertrain > Engine and ECT > 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 [10/2015 - 08/2016] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2016 - 12/2017]

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.
Turn the power switch on (IG).
Turn the Techstream on.

Put the engine in inspection mode (maintenance mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

Start the engine.

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

Powertrain > Engine and ECT > 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 7

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 6

Result:

See step 4

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.

Put the engine in inspection mode (maintenance mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

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.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / MAP and Throttle Idle Position.

Powertrain > Engine and ECT > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
MAP
Throttle Idle Position

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.

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 (1.45 psi) 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

Proceed to
OK
NG

Result:

See step 14

Result:

See step 5

INSPECT EGR VALVE ASSEMBLY

Remove the EGR valve assembly.
Refer to REMOVAL [10/2015 - ]

Check if the EGR valve is stuck open.

EGR valve is tightly closed.

Result

Proceed to
OK
NG

Result:

See step 14

Result:

See step 16

REPAIR OR REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

Repair or replace the throttle body with motor assembly.

Refer to REMOVAL [10/2015 - ]

HINT:

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

Refer to INITIALIZATION [10/2015 - ]

Result

Proceed to
NEXT

Result:

See step 20

CHECK PCV SYSTEM

Check the PCV hose connections.

Refer to COMPONENTS [10/2015 - ]

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

Result

Proceed to
OK
NG

Result:

See step 19

Result:

See step 8

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Refer to PROCEDURE - Step 1

No leaks from intake system.

Result

Proceed to
OK
NG

Result:

See step 18

Result:

See step 9

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 17

Result:

See step 10

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.

Put the engine in inspection mode (maintenance mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

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.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / MAP and Throttle Idle Position.

Powertrain > Engine and ECT > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
MAP
Throttle Idle Position

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.

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 (1.45 psi) 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

Proceed to
OK
NG

Result:

See step 12

Result:

See step 11

INSPECT EGR VALVE ASSEMBLY

Remove the EGR valve assembly.
Refer to REMOVAL [10/2015 - ]

Check if the EGR valve is stuck open.

EGR valve is tightly closed.

Result

Proceed to
OK
NG

Result:

See step 16

Result:

See step 12

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.
Refer to PROCEDURE - Step 2

Result

Proceed to
OK
NG

Result:

See step 15

Result:

See step 13

READ VALUE USING TECHSTREAM (MAF)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.

Put the engine in inspection mode (maintenance mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

Start the engine.

Enter the following menus: Powertrain / Engine and ECT / Data List / MAF, Coolant Temp and Engine Speed.

Powertrain > Engine and ECT > Data List

Tester Display
Engine Speed
MAF
Coolant Temp

Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.

Read MAF with the engine speed at 2500 rpm.

HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, read the Data List item after charge control has completed.

Standard

Techstream Display	Condition	Specified Condition
MAF	Engine warmed up Shift lever position: P A/C: Off Engine Speed: 2500 rpm	Between 8.5 and 12.5 gm/sec

Result

Proceed to
OK
NG

Result:

See step 21

Result:

See step 14

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

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

Powertrain > Engine and ECT > Data List

Tester Display
Coolant Temp

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).

Put the engine in inspection mode (maintenance mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

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 the Confirmation Driving Pattern.

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

Powertrain > Engine and ECT > 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 [10/2015 - ]

Result:

See step 21

CHECK AND REPAIR VVT SYSTEM

Check and repair the VVT system.

HINT:

Refer to DTC P0011 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); DTC P0021: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2); DTC P0022: Camshaft Position "A" - Timing Over-Retarded (Bank 2) [10/2015 - ]

Result

Proceed to
NEXT

Result:

See step 20

REPLACE EGR VALVE ASSEMBLY

Replace the EGR valve assembly.

Refer to REMOVAL [10/2015 - ]

HINT:

Perform "Inspection After Repair" after replacing the EGR valve assembly.

Refer to INITIALIZATION [10/2015 - ]

Result

Proceed to
NEXT

Result:

See step 20

REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

Replace the air cleaner filter element sub-assembly.

Result

Proceed to
NEXT

Result:

See step 20

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 [10/2015 - ]

Result

Proceed to
NEXT

Result:

See step 20

REPAIR OR REPLACE PCV HOSE

Repair or replace PCV valve or hose.

Result

Proceed to
NEXT

Result:

See step 20

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

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

Powertrain > Engine and ECT > Data List

Tester Display
Coolant Temp

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).

Put the engine in inspection mode (maintenance mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

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 the Confirmation Driving Pattern.

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

Powertrain > Engine and ECT > 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 21

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 assembly.

Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2015 - ]

HINT:

Repair any problems.

Result

Proceed to
NEXT

Result:

See step 22

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

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

Powertrain > Engine and ECT > Data List

Tester Display
Coolant Temp

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).

Put the engine in inspection mode (maintenance mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

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 the Confirmation Driving Pattern.

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

Powertrain > Engine and ECT > 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 23

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

Disconnect the mass air flow meter sub-assembly connector.
Disconnect the ECM assembly connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
D9-3 (5V) - D1-99 (VCVG)	Always	Below 1 Ω
D9-1 (FG) - D1-128 (VG)	Always	Below 1 Ω
D9-2 (E2G) - D1-96 (E2G)	Always	Below 1 Ω
D9-3 (5V) or D1-99 (VCVG) - Body ground and other terminals	Always	10 kΩ or higher
D9-1 (FG) or D1-128 (VG) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 24

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

Replace the mass air flow meter sub-assembly.

Refer to REMOVAL [10/2015 - ]

HINT:

If the result of the inspection 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 [10/2015 - ]

Result

Proceed to
NEXT

Result:

See step 25

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

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

Powertrain > Engine and ECT > Data List

Tester Display
Coolant Temp

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).

Put the engine in inspection mode (maintenance mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

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 the Confirmation Driving Pattern.

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

Powertrain > Engine and ECT > 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 ASSEMBLY. Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 03/2018]