DTC P050A-00: Cold Start Idle Control System Performance [11/2021 - 03/2023]: Procedure

1. 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: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 03/2024] 

Result: 

A 

See step  2

HINT: 

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

1. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

2. Start the engine.
3. Read the values displayed on the GTS at engine idle.

   Powertrain > Engine > Data List 

   Tester Display
   Short FT B1S1
   Long FT B1S1

4. Add the Short FT B1S1 and Long FT B1S1 values to obtain the total fuel trim.

   Standard

   GTS Display	Specified Condition
   Total of Short FT B1S1 and Long FT B1S1	Between -20 and 20%

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  3

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

   OK

   Throttle valve is not contaminated with foreign matter and moves smoothly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  6

Result: 

OK 

See step  4

1. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

2. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

   HINT: 

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

3. 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.

   Powertrain > Engine > Active Test 

   Active Test Display
   Control the EGR Step Position

   Data List Display
   Intake Manifold Absolute Pressure
   Engine Independent

   NOTE:

   • Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
   • 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

   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

   Proceed to
   OK
   NG

Result: 

OK 

See step  14

Result: 

NG 

See step  5

1. Remove the EGR valve assembly.

   Refer to REMOVAL [11/2021 - ]

2. Check if the EGR valve is stuck open.

   OK

   EGR valve is tightly closed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  14

Result: 

NG 

See step  17

Refer to REMOVAL [11/2021 - ]

HINT: 

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

Refer to INITIALIZATION [11/2021 - ]

Result

Result: 

NEXT 

See step  21

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the PCV hose connections.
2. Check the PCV valve.

   Refer to INSPECTION [11/2021 - ]

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  20

Result: 

OK 

See step  8

1. Check the intake system for vacuum leaks.

   Refer to ON-VEHICLE INSPECTION [11/2021 - ]

   OK

   No leaks from intake system.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  19

Result: 

OK 

See step  9

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

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  18

Result: 

OK 

See step  10

1. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

2. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

   HINT: 

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

3. 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.

   Powertrain > Engine > Active Test 

   Active Test Display
   Control the EGR Step Position

   Data List Display
   Intake Manifold Absolute Pressure
   Engine Independent

   NOTE:

   • Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
   • 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

   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

   Proceed to
   OK
   NG

Result: 

OK 

See step  12

Result: 

NG 

See step  11

1. Remove the EGR valve assembly.

   Refer to REMOVAL [11/2021 - ]

2. Check if the EGR valve is stuck open.

   OK

   EGR valve is tightly closed.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  17

Result: 

OK 

See step  12

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 P0011-00 Procedure (VVT-iE system for intake camshaft).

      Refer to DTC P0011-00: Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 1 [11/2021 - ]

   2. Perform the Active Test, referring to DTC P0014-00 Procedure (VVT-i system for exhaust camshaft).

      Refer to PROCEDURE - Step 2

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  16

Result: 

OK 

See step  13

1. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

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

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

4. Read Mass Air Flow Sensor while maintaining an engine speed of 2500 rpm.

   Powertrain > Engine > Data List 

   Tester Display
   Engine Speed
   Mass Air Flow Sensor

   Standard

   GTS Display	Condition	Specified Condition
   Mass Air Flow Sensor	Engine warmed up Shift position: N A/C: Off Engine Speed: 2500 rpm	Between 6.2 and 18.6 gm/sec

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  23

Result: 

OK 

See step  14

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  15

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

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

2. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

3. 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.
4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
5. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

6. Input the DTC: P050A-00.

   Result

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

Result: 

A 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [11/2021 - ] 

Result: 

B 

See step  23

1. Check and repair the VVT system.

   HINT: 

   • Refer to DTC P0011-00 Inspection Procedure (VVT-iE system for intake camshaft).

     Refer to DTC P0011-00: Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 1 [11/2021 - ]

   • Refer to DTC P0014-00 Inspection Procedure (VVT-i system for exhaust camshaft).

     Refer to DTC P0014-00: Camshaft Position "B" - Timing Over-Advanced or System Performance Bank 1; DTC P0015-00: Camshaft Position "B" - Timing Over-Retarded Bank 1 [11/2021 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  21

Refer to REMOVAL [11/2021 - ]

HINT: 

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

Refer to INITIALIZATION [11/2021 - ]

Result

Result: 

NEXT 

See step  21

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  21

1. Repair or replace the intake system.

   HINT: 

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

   Refer to INITIALIZATION [11/2021 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  21

1. Repair or replace PCV valve or hose.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  21

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  22

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

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

2. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

3. 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.
4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
5. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

6. Input the DTC: P050A-00.

   Result

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

Result: 

A 

END 

Result: 

B 

See step  23

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 [11/2021 - ]

   HINT: 

   Repair any problems.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  24

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  25

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

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

2. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

3. 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.
4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
5. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

6. Input the DTC: P050A-00.

   Result

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

Result: 

A 

END 

Result: 

B 

See step  26

1. Disconnect the mass air flow meter sub-assembly connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B20-3 (VCC) - B48-78 (VCVG)	Always	Below 1 Ω
   B20-1 (FG) - B48-101 (VG)	Always	Below 1 Ω
   B20-2 (E2G) - B48-79 (E2G)	Always	Below 1 Ω
   B20-3 (VCC) or B48-78 (VCVG) - Body ground and other terminals	Always	10 kΩ or higher
   B20-1 (FG) or B48-101 (VG) - Body ground and other terminals	Always	10 kΩ or higher
   B20-2 (E2G) or B48-79 (E2G) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  27

Refer to REMOVAL [11/2021 - ]

HINT: 

• If the result of the inspection performed in step 13 (READ VALUE USING GTS (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 [11/2021 - ]

Result

Result: 

NEXT 

See step  28

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  29

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

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

2. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

3. 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.
4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
5. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

6. Input the DTC: P050A-00.

   Result

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

Result: 

A 

END 

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [11/2021 - ]