DTC P0100-64: Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure [10/2022 - 08/2023]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   P0100-64 and other DTCs are output	A
   P0100-64 is output	B

   HINT: 

   If any DTCs other than P0100-64 are output, troubleshoot those DTCs first.

Result: 

A 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 08/2023] 

Result: 

B 

See step  2

1. Check the intake system for vacuum leaks.

   Refer to ON-VEHICLE INSPECTION [10/2022 - ]

   OK

   No leaks from intake system.

   HINT: 

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

   Refer to INITIALIZATION [10/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE INTAKE SYSTEM 

Result: 

OK 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Refer to INSPECTION [10/2022 - ]

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE PCV VALVE OR HOSE 

Result: 

OK 

See step  4

Pre-procedure1

• 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 accessories should be off.

  Powertrain > Engine > Data List 

  Tester Display
  Coolant Temperature

• 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:

  • 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

  Result	Proceed to
  Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed	A
  None of the above conditions are met	B

Post-procedure1

• None.

Result: 

A 

See step  6

Result: 

B 

See step  5

Pre-procedure1

• Remove the EGR valve assembly.

  HINT: 

  Refer to REMOVAL [10/2022 - 08/2023]

• Check if the EGR valve is stuck open.

  OK

  EGR valve is tightly closed.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

REPLACE EGR VALVE ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023] 

Result: 

OK 

See step  6

Refer to INSPECTION [10/2022 - ]

Result

Result: 

NEXT 

See step  7

Pre-procedure1

• None.

• Clear the DTCs.

  Powertrain > Engine > Clear DTCs 

  Result

  Proceed to
  NEXT

Post-procedure1

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

Result: 

NEXT 

See step  8

Pre-procedure1

• Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

• Check the DTC judgment result.

  Powertrain > Engine > Utility 

  Tester Display
  All Readiness

• Input the DTC: P0100-64.

  Result

  GTS Display	Description
  NORMAL	DTC judgment completed System normal
  ABNORMAL	DTC judgment completed System abnormal
  INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

  Result

  Proceed to
  NEXT

Post-procedure1

• None.

Result: 

NEXT 

END