DTC P050A-00: Cold Start Idle Control System Performance [11/2015 - 11/2017]: Procedure

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A-00)

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

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTC P050A-00 is output	A
DTC P050A-00 and other DTCs are output	B

HINT:

If any DTCs other than P050A-00 are output, troubleshoot those DTCs first.

Result:

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2015 - 08/2016] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2016 - 11/2017]

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 / Data List / Short FT Bank 1 and Long FT Bank 1.

Powertrain > Engine > Data List

Tester Display
Short FT Bank 1
Long FT Bank 1

Read the values displayed on the Techstream at engine idle.

Add the Short FT Bank 1 and Long FT Bank 1 values to obtain the total fuel trim.

Standard

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

Result

Proceed to
OK
NG

Result:

See step 7

Result:

See step 3

INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body assembly. Also, check that the throttle valve moves smoothly.

Throttle valve is not contaminated with foreign matter and 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 is 75°C (167°F) or higher.
HINT:

The A/C switch and all accessories should be off.

Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure, EGR Step Position and Engine Independent.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
EGR Step Position
Engine Independent

Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

NOTE:

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.

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard

-	Control the EGR Step Position (Active Test)
-	0 Steps	0 to 30 Steps
Intake Manifold Absolute Pressure (Data List)	(EGR valve is fully closed)	Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Result

Result	Proceed to
The value of Intake Manifold Absolute Pressure increases by 10 kPa(abs) or more, compared to when the EGR valve was fully closed (0 step)	OK
Other than above	NG

HINT:

10 kPa = 1.45 psi

Result:

See step 14

Result:

See step 5

INSPECT EGR VALVE ASSEMBLY

Remove the EGR valve assembly.
HINT:

Refer to REMOVAL [11/2015 - 12/2018]

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 25

REPLACE THROTTLE BODY ASSEMBLY

Replace the throttle body assembly.

HINT:

Refer to REMOVAL [11/2015 - ]
Perform "Inspection After Repair" after replacing the throttle body assembly.
Refer to INITIALIZATION [11/2015 - ]

Result

Proceed to
NEXT

Result:

See step 29

CHECK PCV HOSE CONNECTIONS

Check the PCV hose connections.

HINT:

Refer to COMPONENTS [11/2015 - ]

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

Result

Proceed to
OK
NG

Result:

See step 28

Result:

See step 8

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Refer to ON-VEHICLE INSPECTION [11/2015 - ]

No leaks from intake system.

Result

Proceed to
OK
NG

Result:

See step 27

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 26

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 is 75°C (167°F) or higher.
HINT:

The A/C switch and all accessories should be off.

Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure, EGR Step Position and Engine Independent.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
EGR Step Position
Engine Independent

Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

NOTE:

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.

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard

-	Control the EGR Step Position (Active Test)
-	0 Steps	0 to 30 Steps
Intake Manifold Absolute Pressure (Data List)	(EGR valve is fully closed)	Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Result

Result	Proceed to
The value of Intake Manifold Absolute Pressure increases by 10 kPa(abs) or more, compared to when the EGR valve was fully closed (0 step)	OK
Other than above	NG

HINT:

10 kPa = 1.45 psi

Result:

See step 12

Result:

See step 11

INSPECT EGR VALVE ASSEMBLY

Remove the EGR valve assembly.
HINT:

Refer to REMOVAL [11/2015 - 12/2018]

Check if the EGR valve is stuck open.

EGR valve is tightly closed.

Result

Proceed to
OK
NG

Result:

See step 25

Result:

See step 12

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INTAKE VVT OCV DUTY RATIO BANK 1)

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 / Active Test / Control the Intake VVT OCV Duty Ratio Bank 1 / Data List / Intake VVT Change Angle Bank 1.

Powertrain > Engine > Active Test

Active Test Display
Control the Intake VVT OCV Duty Ratio Bank 1

Data List Display
Intake VVT Change Angle Bank 1

Read the Data List while performing the Active Test with the engine idling.

Techstream Operation	Data List (Intake VVT Change Angle Bank 1)
-100% to 100%	Varies by 70 DegFR or more

HINT:

Test not possible with park (P) selected during charge control. Select neutral (N) to perform test.
If DTCs are stored after the Active Test, clear the DTCs.

Result

Result	Proceed to
The value of Intake VVT Change Angle Bank 1 is 70 DegFR or more	OK
Other than above	NG

Result:

See step 16

Result:

See step 13

READ VALUE USING TECHSTREAM (MASS AIR FLOW SENSOR)

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 / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor
Coolant Temperature

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

Read Mass Air Flow Sensor with the engine speed at 2500 rpm.

HINT:

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

Standard

Techstream Display	Condition	Specified Condition
Mass Air Flow Sensor	Engine warmed up Shift position: P A/C: Off Engine Speed: 2500 rpm	Between 4.5 and 8.5 gm/sec

Result

Result	Proceed to
The value of Mass Air Flow Sensor is between 4.5 gm/sec and 8.5 gm/sec	OK
Other than above	NG

Result:

See step 31

Result:

See step 14

CLEAR DTC

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Powertrain > Engine > Clear DTCs

Turn the power switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

Result:

See step 15

CHECK WHETHER DTC OUTPUT RECURS (DTC P050A-00)

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.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (Maintenance Mode).
HINT:

Refer to INSPECTION MODE PROCEDURE [11/2015 - 12/2018]
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 / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

Input the DTC: P050A-00.

Check the DTC judgment result.

Result

Result	Proceed to
NORMAL (DTCs are not output)	A
ABNORMAL (DTC P050A-00 is output)	B

Result:

CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [11/2015 - ]

Result:

See step 31

INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

Inspect the camshaft timing oil control valve assembly.

Refer to INSPECTION [11/2015 - ]

Result

Proceed to
OK
NG

Result:

See step 24

Result:

See step 17

CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

Remove the cylinder head cover sub-assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	39.5°	*b	Timing Mark
*c	"0" Timing Mark	*d	Groove

Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain or belt cover sub-assembly.

Check that the timing marks of the camshaft timing gear assembly and camshaft timing sprocket are at the positions shown in the illustration.

HINT:

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

Timing marks on camshaft timing gear assembly and camshaft timing sprocket are at the positions shown in the illustration.

HINT:

If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

Result

Proceed to
OK
NG

Result:

See step 22

Result:

See step 18

INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

Inspect the camshaft timing gear assembly.

HINT:

Refer to PROCEDURE - Step 30

Result

Proceed to
OK
NG

Result:

See step 21

Result:

See step 19

INSPECT OIL CONTROL VALVE FILTER

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Oil Control Valve Filter

Remove the oil control valve filter.
HINT:

Refer to PROCEDURE - Step 39

Check that the filter is not clogged.

Filter is not clogged.

Result

Proceed to
OK
NG

Result:

See step 29

Result:

See step 20

REPLACE OIL CONTROL VALVE FILTER

Replace the oil control valve filter.

HINT:

Refer to PROCEDURE - Step 39

Result

Proceed to
NEXT

Result:

See step 29

REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

Replace the camshaft timing gear assembly.

HINT:

Refer to REMOVAL [11/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 07/2020]
Perform "Inspection After Repair" after replacing the camshaft timing gear assembly.
Refer to INITIALIZATION [11/2015 - ]

Result

Proceed to
NEXT

Result:

See step 29

CHECK ENGINE MECHANICAL SYSTEM

Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.

Result

Proceed to
OK
NG

Result:

See step 29

Result:

See step 23

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
HINT:

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

Refer to INITIALIZATION [11/2015 - ]

Result

Proceed to

NEXT

Result:

NEXT

See step 29

REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

Replace the camshaft timing oil control valve assembly.

HINT:

Refer to REMOVAL [11/2015 - ]

Result

Proceed to
NEXT

Result:

See step 29

REPLACE EGR VALVE ASSEMBLY

Replace the EGR valve assembly.

HINT:

Refer to REMOVAL [11/2015 - 12/2018]
Perform "Inspection After Repair" after replacing the EGR valve assembly.
Refer to INITIALIZATION [11/2015 - ]

Result

Proceed to
NEXT

Result:

See step 29

REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

Replace the air cleaner filter element sub-assembly.

Result

Proceed to
NEXT

Result:

See step 29

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 [11/2015 - ]

Result

Proceed to
NEXT

Result:

See step 29

REPAIR OR REPLACE PCV HOSE

Repair or replace PCV valve or hose.

Result

Proceed to
NEXT

Result:

See step 29

CLEAR DTC

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Powertrain > Engine > Clear DTCs

Turn the power switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

Result:

See step 30

CHECK WHETHER DTC OUTPUT RECURS (DTC P050A-00)

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.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (Maintenance Mode).
HINT:

Refer to INSPECTION MODE PROCEDURE [11/2015 - 12/2018]
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 / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

Input the DTC: P050A-00.

Check the DTC judgment result.

Result

Result	Proceed to
NORMAL (DTCs are not output)	A
ABNORMAL (DTC P050A-00 is output)	B

Result:

END

Result:

See step 31

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.

HINT:

Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [11/2015 - ]
Repair any problems.

Result

Proceed to
NEXT

Result:

See step 32

CLEAR DTC

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Powertrain > Engine > Clear DTCs

Turn the power switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

Result:

See step 33

CHECK WHETHER DTC OUTPUT RECURS (DTC P050A-00)

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.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (Maintenance Mode).
HINT:

Refer to INSPECTION MODE PROCEDURE [11/2015 - 12/2018]
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 / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

Input the DTC: P050A-00.

Check the DTC judgment result.

Result

Result	Proceed to
NORMAL (DTCs are not output)	A
ABNORMAL (DTC P050A-00 is output)	B

Result:

END

Result:

See step 34

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

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

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

Standard Resistance

(C5, C31)

(C5)

(C31)

Tester Connection	Condition	Specified Condition
C5-3 (VG) - C31-137 (VG)	Always	Below 1 Ω
C5-2 (E2G) - C31-104 (E2G)	Always	Below 1 Ω
C5-3 (VG) or C31-137 (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 35

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

Replace the mass air flow meter sub-assembly.

HINT:

Refer to REMOVAL [11/2015 - ]
If the result of the inspection performed in step 13 (READ VALUE USING TECHSTREAM (MASS AIR FLOW SENSOR)) 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 [11/2015 - ]

Result

Proceed to
NEXT

Result:

See step 36

CLEAR DTC

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Powertrain > Engine > Clear DTCs

Turn the power switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

Result:

See step 37

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

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.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
Put the engine in Inspection Mode (Maintenance Mode).
HINT:

Refer to INSPECTION MODE PROCEDURE [11/2015 - 12/2018]
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 / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

Input the DTC: P050A-00.

Check the DTC judgment result.

Result

Result	Proceed to
NORMAL (DTCs are not output)	A
ABNORMAL (DTC P050A-00 is output)	B

Result:

END

Result:

REPLACE ECM. Refer to REMOVAL [11/2015 - 12/2018]