M20F-FXS, M20G-FXS ENGINE CONTROL SFI SYSTEM P010064 Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure
DESCRIPTION
Refer to DTC P010012.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P010064 | Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure | All of the following conditions are met (2 trip detection logic).
1.
The engine is running. 2.
The engine coolant temperature is 70°C (158°F) or higher. 3.
The throttle position sensor voltage is 0.2 V or higher, and less than 2 V. 4.
Average engine load value ratio is less than 0.85, or higher than 1.15 (varies with estimated engine load). Average engine load value ratio = Average engine load based on mass air flow meter output / Average engine load estimated from driving conditions 5.
Average air fuel ratio is less than -11%, or higher than 16%. |
·
Mass air flow meter ·
Intake system ·
PCV hose connections ·
EGR valve assembly |
Comes on | SAE Code: P0101 |
MONITOR DESCRIPTION
The mass air flow meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine fuel injection timing and to provide an appropriate air fuel ratio. Inside the mass air flow meter, there is a heated platinum wire which is exposed to the flow of intake air. By applying a specific electrical current to the wire, the ECM heats it to a specific temperature. The flow of incoming air cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to the mass air flow meter. The voltage level is proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume.
The ECM monitors the average engine load value ratio to check the mass air flow meter for malfunctions. The average engine load value ratio is obtained by comparing the average engine load calculated from the mass air flow meter output to the average engine load estimated from the driving conditions, such as the engine speed and the throttle opening angle. If the average engine load value ratio is below the threshold value, the ECM determines that the intake air volume is low, and if the average engine load value ratio is above the threshold value, the ECM determines that the intake air volume is high. If either of these conditions is detected in 2 consecutive driving cycles, the ECM illuminates the MIL and stores this DTC.
MONITOR STRATEGY
| Required Sensors/Components (Main) | Mass air flow meter |
| Required Sensors/Components (Related) | Crankshaft position sensor
Camshaft position sensor Engine coolant temperature sensor Throttle position sensor |
| Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
- HINT:
- ·
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).
Start the engine and warm it up until the engine coolant temperature is 70°C (158°F) or higher [A].
With the engine running, drive the vehicle at approximately 80 km/h (50 mph) to 112 km/h (70 mph) for 5 minutes or more [B].
- CAUTION:
-
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- HINT:
- ·
Drive while keeping the engine load as stable as possible.
·If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
- HINT:
- ·
If a pending DTC is output, the system is malfunctioning.
·If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P010064.
Check the DTC judgment 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 |
- HINT:
- ·
If the judgment result is NORMAL, the system is normal.
·If the judgment result is ABNORMAL, the system is malfunctioning.
·If the judgment result is INCOMPLETE, perform steps [B] through [C] again.
·[A] to [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
·When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
(Select Powertrain in Health Check and then check the time stamp data.)
·If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
- HINT:
-
Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
Read the DTCs.
- Powertrain > Engine > Trouble Codes
- 50001 372
- Result:
Result Proceed to DTC P010064 is output A DTC P010064 and other DTCs are output B
- HINT:
-
If any DTCs other than P010064 are output, troubleshoot those DTCs first.
A
B
Check the intake system for vacuum leaks.
- OK:
No leaks from intake system.
- HINT:
-
Perform "Inspection After Repair" after repairing or replacing the intake system.
- Result:
Proceed to OK NG
OK
NG
Check the PCV hose connections.
- OK:
PCV hose and PCV valve are connected correctly and are not damaged.
- Result:
Proceed to OK NG
OK
NG
Put the engine in Inspection Mode (Maintenance Mode).
- Powertrain > Hybrid Control > Utility
-
Tester Display Inspection Mode - 50005 397 2103
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
-
Active Test Display Control the EGR Step Position -
Data List Display Intake Manifold Absolute Pressure Coolant Temperature Engine Independent - 50004 372 25 385,205,428
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.
- NOTICE:
- ·
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
OK
NG
Remove the EGR valve assembly.
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.
- Result:
Proceed to OK NG
OK
NG
- Result:
Proceed to NEXT
NEXT
Clear the DTCs.
- Powertrain > Engine > Clear DTCs
- 50002 372
Turn the ignition switch off and wait for at least 30 seconds.
- Result:
Proceed to NEXT
NEXT
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
- Powertrain > Engine > Utility
-
Tester Display All Readiness - 50005 372 20
Input the DTC: P010064.
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
NEXT