DTC P0100-64: Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure [03/2022 - 03/2023]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

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

   HINT: 

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

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2022 - 03/2023] 

Result: 

A 

See step  2

1. Check the intake system for vacuum leaks.

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

   OK

   No leaks from intake system.

   HINT: 

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

   Refer to INITIALIZATION [11/2021 - ]

   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 [11/2021 - ]

   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

1. 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.

2. Check the engine idling condition and Intake Manifold Absolute Pressure values in the Data List while performing the Active Test.

   Powertrain > Engine > Active Test 

   Active Test Display
   Control the EGR Step Position

   Data List Display
   Engine Speed
   Intake Manifold Absolute Pressure
   Coolant Temperature

   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 and Engine Speed change in response to EGR step position.

   Standard

   -	EGR Step Position (Active Test)
   	0 Steps	0 to 30 Steps
   Idling condition	Steady idling	Idling changes from steady to rough idling or engine stalls
   Intake Manifold Absolute Pressure (Data List)	Intake Manifold Absolute Pressure value is 20 to 40 kPa (abs) (2.9 to 5.8 psi (abs)) (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: 

   During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  6

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.

   HINT: 

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

   Refer to INITIALIZATION [11/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE EGR VALVE ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

OK 

See step  6

Refer to INSPECTION [11/2021 - ]

Result

Result: 

NEXT 

See step  7

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  8

1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
2. Perform the All Readiness.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

3. Input the DTC: P0100-64.
4. Check the DTC judgment result.

   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

Result: 

NEXT 

END