NR Series 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 | Memory | Note |
|---|---|---|---|---|---|---|
| P010064 | Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure | All of the following 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 below 2 V. 4.
The 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 sub-assembly output / Average engine load estimated from driving conditions 5.
The average air fuel ratio is less than -7%, or higher than 10%. |
·
Mass air flow meter sub-assembly ·
Intake system ·
PCV system |
Comes on | DTC stored | SAE Code: P0101 |
MONITOR DESCRIPTION
The mass air flow meter sub-assembly 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 sub-assembly, 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 sub-assembly. 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 sub-assembly for malfunctions. The average engine load value ratio is obtained by comparing the average engine load calculated from the mass air flow meter sub-assembly 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 this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is stored.
MONITOR STRATEGY
| Required Sensors/Components (Main) | Mass air flow meter sub-assembly |
| Required Sensors/Components (Related) | Crankshaft position sensor
Camshaft position sensor Engine coolant temperature sensor Throttle position sensor |
| Frequency of Operation | Once per driving cycle |
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.
Start the engine and warm it up until the engine coolant temperature reaches 70°C (158°F) or higher [A].
Turn the GTS on.
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.
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 shows NORMAL, the system is normal.
·If the judgment result shows ABNORMAL, the system has a malfunction.
·If the judgment result shows 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 battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
CAUTION / NOTICE / HINT
- NOTICE:
-
Inspect the fuses for circuits related to this system before performing the following procedure.
- 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
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.
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 in intake system.
- HINT:
-
Perform "Inspection After Repair" after repairing or replacing the intake system.
- Result:
Proceed to OK NG
OK
NG
| *1 | Air Hole Cover |
Before inspecting the PCV valve, first check that there is no suction from the air hole cover.
- OK:
No suction from air hole cover, and PCV valve operation is normal.
- Result:
Proceed to OK NG
OK
NG
Replace the mass air flow meter sub-assembly.
- HINT:
-
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
- Result:
Proceed to NEXT
NEXT
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
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.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Powertrain > Engine > Utility
-
Tester Display All Readiness - 50005 372 20
Input the DTC: P010064.
Check the DTC judgment.
| 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