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Thottle Sensor
- 0.5 to 1.0 voltage
Idle
- Wide open throttle
4 or above
- Does not control
how much air coming
Manifold Absolute Pressure
- Senses Engine Load
- Works fine even there
is air Leak
- converts vacuum/Manifold
pressure to electrical
signal to ECU
The Manifold Absolute Pressure MAP sensor is a sensor that is attached to
the intake manifold on a car's engine. The MAP sensor responds to changes in the intake manifold pressure (vacuum) and provides a reading of "engine load"
Mass Air Flow
- Best devise to measure load and density
LOAD
AFM, MAP, TPS SENSORS
A constant voltage is applied to the heated film or heated
wire. This film or wire is positioned in the air stream or in an air
flow sampling channel and is heated by the electrical current that
the voltage produces. As air flows across it, it cools down
This means that it's resistance drops when it's temperature drops.
The drop in resistance allows more current to flow through it in order
to maintain the programmed temperature. This current is changed
to a frequency or a voltage which is sent to the computer and
interpreted as air flow.
The engine is very hard to start or turn over
The engine stalls shortly after starting
The engine hesitates or drags while under load or idle
Hesitation and jerking during acceleration
The engine hiccups
Excessively rich or lean idle