Dtc p0100 mass or volume air flow circuit
Dtc p0102 mass or volume air flow circuit low input
Dtc p0103 mass or volume air flow circuit high input
Circuit description
The maf (mass air flow) sensor measures the amount of air flowing through the throttle valve. The ecm uses this information to determine the fuel injection time and provide a proper air–fuel ratio. Inside the maf sensor, there is a heated platinum wire exposed to the flow of intake air.
By applying a specific current to the wire, the ecm heats this wire to a given temperature. The flow of incoming air cools the wire and an internal thermister, changing their resistance. To maintain a constant current value, the ecm varies the voltage applied to these components in the maf sensor. The voltage level is proportional to the airflow through the sensor and the ecm interprets this voltage as the intake air amount.
The circuit is constructed so that the platinum hot wire and the temperature sensor provides a bridge circuit, with the power transistor controlled so that the potential of a and b remains equal to maintain the set temperature.
Hint
: after confirming dtc p0100, p0102 or p0103, confirm the mass air flow ratio in the ”diagnosis / enhanced obd ii / data list / all” using the hand–held tester or the obd ii scan tool.
Monitor description
If there is a defect in the sensor or an open or short circuit, the voltage level will deviate outside the normal operating range. The ecm interprets this deviation as a defect in the maf sensor and sets a dtc.
Example: when the sensor voltage output is less than 0.2 V or more than 4.9 V and if either the condition continues for more than 3 seconds.
Monitor strategy
Typical enabling conditions
Typical malfunction thresholds
Component operating range
Wiring diagram
Inspection procedure
Hint
: read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc. At the time of the malfunction.
1 Read value of hand–held tester or obd ii scan tool(mass air flow rate)
Result:
*1: The value must be changed when the throttle valve is opened or closed.
2 Inspect mass air flow sensor(power source)
Standard:
3 Inspect ecm(vg voltage)
Hint
: the shift position should be p or n and the a/c switch should be turned off. Standard:
4 Check harness and connector(mass air flow sensor – ecm)
Standard (check for open):
Standard (check for short):
Replace mass air flow sensor
5 Check harness and connector(mass air flow sensor – efi relay)
Standard (check for open):
Standard (check for short):
Check for ecm power source circuit
6 Inspect ecm(sensor ground)
Standard:
7 Check harness and connector(mass air flow sensor – ecm)
Standard (check for open):
Standard (check for short):
Replace mass air flow sensor
Warning function
If you leave the lane
If you leave the lane and if a lane marking has
been detected, the steering wheel vibrates in accordance
with the steering wheel vibration setting.
If the turn signal is switched on before a lane
change, a warning is not issued.
With side collision mitigation
When in the speed ...
Overview
Button in the vehicle
Intelligent Safety
Radar sensors
The radar sensors are located in the rear
bumper.
Always keep the bumper in the area of the radar
sensors clean and unobstructed.
Switching on/off
Switching on automatically
Blind spot collision warning is automatically activated
after depart ...
On–vehicle inspection
Notice:
”cold” and ”hot” in these sentences express the temperature of the coils
themselves. ”Cold” is from
–10 c (14 f) to 50 c (122 f) and ”hot” is from 50 c (122 f) to 100 c (212 f).
1. Inspect ignition coil (with igniter) and spark test
confirm dtc.
Notice:
if dtc is indicat ...