DTC P0100-64: Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure [06/2020 - 08/2020]: Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0100-64)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

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:

GO TO DTC CHART

Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2020 - 08/2020]

Result:

See step 2

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Refer to ON-VEHICLE INSPECTION [02/2019 - 08/2020]

No leaks from intake system.

HINT:

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

Refer to INITIALIZATION [10/2019 - 08/2020]

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE INTAKE SYSTEM

Result:

See step 3

CHECK PCV VALVE AND HOSE CONNECTIONS

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the PCV hose connections.

Check the PCV valve.

Refer to INSPECTION [11/2018 - ]

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

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE PCV VALVE OR HOSE

Result:

See step 4

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

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
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 accessories should be off.

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

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Coolant Temperature
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

Proceed to
OK
NG

Result:

See step 6

Result:

See step 5

INSPECT EGR VALVE ASSEMBLY

Remove the EGR valve assembly.
Refer to REMOVAL [02/2019 - 08/2020]

Check if the EGR valve is stuck open.

EGR valve is tightly closed.

HINT:

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

Refer to INITIALIZATION [10/2019 - 08/2020]

Result

Proceed to
OK
NG

Result:

REPLACE EGR VALVE ASSEMBLY

Refer to REMOVAL [02/2019 - 08/2020]

Result:

See step 6

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY
Refer to ON-VEHICLE INSPECTION [02/2019 - 08/2020]

Result

Proceed to

NEXT

Result:

NEXT

See step 7

CLEAR DTC

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Clear the DTCs.
Powertrain > Engine > Clear DTCs

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

Result

Proceed to
NEXT

Result:

See step 8

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

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: P0100-64.

Check the DTC judgment result.

Result

Techstream 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:

END