DESCRIPTION
Refer to DTC P0102 (See page ).
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
P0101 |
All of the following conditions are met (2 trip detection logic): (a) The engine is running. (b) The engine coolant temperature is 70°C (158°F) or higher. (c) The throttle position sensor voltage is 0.24 V or more, and less than 2 V. (d) The average engine load value ratio is less than 0.85, or more than 1.32 (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 (e) The average air fuel ratio is less than -20% or more than 20%. |
|
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 the fuel injection time 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 this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is stored.
MONITOR STRATEGY
Related DTCs |
P0101: Mass Air Flow Meter Rationality |
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 |
Duration |
10 times |
MIL Operation |
2 driving cycles |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored |
None |
All of the following conditions are met |
- |
(Throttle position sensor voltage - (learned throttle position sensor closed position voltage + ISC voltage)) |
0.24 V or more, and less than 2 V |
Time after engine start |
5 seconds or more |
Battery voltage |
10.5 V or higher |
Engine coolant temperature |
70°C (158°F) or higher |
Estimated load |
30% or more, and less than 70% |
Mass air flow meter circuit fail (P0102, P0103) |
Not detected |
Intake air temperature circuit fail (P0112, P0113) |
Not detected |
Engine coolant temperature circuit fail (P0115, P0117, P0118) |
Not detected |
Crankshaft position sensor circuit fail (P0335) |
Not detected |
Throttle position sensor circuit fail (P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135) |
Not detected |
EVAP system pressure sensor circuit fail (P0452, P0453) |
Not detected |
Leak detection pump fail (P2401, P2402) |
Not detected |
EVAP vent valve fail (P2419, P2420) |
Not detected |
TYPICAL MALFUNCTION THRESHOLDS
Both of the following conditions are met |
1 and 2 |
1. Average engine load value ratio |
Less than 0.85, or more than 1.32 (varies with estimated engine load) |
2. Average air fuel ratio |
Less than -20%, or more than 20% |
WIRING DIAGRAM
Refer to DTC P0102 (See page ).
CONFIRMATION DRIVING PATTERN
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.
HINT:
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
HINT:
CAUTION / NOTICE / HINT
HINT:
Read freeze frame data using the Techstream. 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
1. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Result |
Proceed to |
---|---|
DTC P0101 is output |
A |
DTC P0101 and other DTCs are output |
B |
HINT:
If any DTCs other than P0101 are output, troubleshoot those DTCs first.
B |
GO TO DTC CHART |
|
2. |
CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leakage (See page ).
OK:
No leakage from intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system (See page ).
NG |
REPAIR OR REPLACE INTAKE SYSTEM |
|
3. |
CHECK PCV HOSE CONNECTIONS |
(a) Check the PCV hose connections (See page ).
OK:
PCV hose is connected correctly and is not damaged.
OK |
REPLACE MASS AIR FLOW METER |
NG |
REPAIR OR REPLACE PCV HOSE |
Child Restraint Seat Tether Anchor
Components
COMPONENTS
ILLUSTRATION
Installation
INSTALLATION
PROCEDURE
1. INSTALL CHILD RESTRAINT SEAT TETHER ANCHOR BRACKET
(a) Engage the guide.
(b) Install the child restraint seat teth ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
CAUTION:
Wear protective gloves when removing the exhaust pipe.
The exhaust pipe is extremely hot immediately after the engine has stopped.
Confirm that the exhaust pipe has cooled down ...
Installation
INSTALLATION
PROCEDURE
1. REPAIR INSTRUCTION
(a) Clean the vehicle body surface.
(1) Using a heat light, heat the vehicle body surface.
Heating Temperature
Item
Temperature
Vehicle Body
40 to 60°C (104 t ...