NR Series ENGINE CONTROL SFI SYSTEM P010014 Mass or Volume Air Flow Sensor "A" Circuit Short to Ground or Open P010016 Mass or Volume Air Flow Sensor "A" Circuit Voltage Below Threshold
DESCRIPTION
Refer to DTC P010012.
- HINT:
-
When P010014 is stored, the ECM enters fail-safe mode. During fail-safe mode, boost prohibited and the ignition timing is calculated by the ECM, according to the engine speed and throttle valve position. Fail-safe mode continues until a pass condition is detected.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P010014 | Mass or Volume Air Flow Sensor "A" Circuit Short to Ground or Open | The mass air flow meter sub-assembly voltage is less than 0.2 V for 3 seconds or more (1 trip detection logic: Engine speed is less than 4000 rpm). | ·
Open or short in mass air flow meter sub-assembly circuit ·
Mass air flow meter sub-assembly ·
ECM |
Comes on | DTC stored | SAE Code: P0102 |
| P010016 | Mass or Volume Air Flow Sensor "A" Circuit Voltage Below Threshold | The mass air flow meter sub-assembly voltage is below 0.2 V for 3 seconds or more (2 trip detection logic: Engine speed is 4000 rpm or more). | ·
Open or short in mass air flow meter sub-assembly circuit ·
Mass air flow meter sub-assembly ·
ECM |
Comes on | DTC stored | SAE Code: P0102 |
- HINT:
-
When this DTC is output, check the mass air flow in the Data List. Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.
DTC No. Mass Air Flow Sensor Malfunction P010014
P0100160.0 gm/sec ·Open in mass air flow meter sub-assembly power source circuit
·Open in VG circuit
·Short to ground in VG circuit
-
If the Data List values is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.
MONITOR DESCRIPTION
If there is a defect or an open or short circuit in the mass air flow meter sub-assembly, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the mass air flow meter sub-assembly circuit and stores this DTC.
Example:
When the sensor output voltage remains less than 0.2 V for 3 seconds or more, the ECM stores this DTC.
MONITOR STRATEGY
| 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 [A].
Turn the GTS on.
Wait 5 seconds or more [B].
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: P010014 or P010016.
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.
·[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.
WIRING DIAGRAM
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
| *a | Front view of wire harness connector
(to Mass Air Flow Meter Sub-assembly) |
Disconnect the mass air flow meter sub-assembly connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition C25-1 (+B) - Body ground Ignition switch ON 11 to 14 V
- Result:
Proceed to OK NG
OK
NG
Disconnect the mass air flow meter sub-assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C25-3 (VG) - C78-92 (VG) Always Below 1 Ω C25-3 (VG) or C78-92 (VG) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
Inspect the mass air flow meter sub-assembly, referring to On-vehicle Inspection for Mass Air Flow Meter.
Inspect the mass air flow meter sub-assembly, referring to Inspection for Mass Air Flow Meter.
Inspect the function of the mass air flow meter sub-assembly.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.
- Powertrain > Engine > Data List
-
Tester Display Mass Air Flow Sensor - 50003 372 215
Start the engine.
Check that the Mass Air Flow Sensor value changes when the engine is raced.
- OK:
The reading changes.
- HINT:
-
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
- Result:
Proceed to OK NG
OK
NG