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- 1 Which fuel-injection system uses MAP sensor as the primary sensor to determine the base pulse width?
- 2 Which sensor is used to calculate the amount of fuel required using the speed density method?
- 3 Which of the following sensors provides information that is the most critical for proper air fuel mixture as well as ignition timing?
- 4 Which sensor is used to calculate the amount of fuel required?
- 5 What makes injectors pulse?
- 6 When testing a MAP sensor The technician should first check the?
- 7 What do the X and y axis mean on a fuel injector?
- 8 What are the four in put sensors and their output devices?
Which fuel-injection system uses MAP sensor as the primary sensor to determine the base pulse width?
1. Correct answer is A Explanation: speed density fuel-injection system uses the MAP sensor as the primary…
Which sensor is used to calculate the amount of fuel required using the speed density method?
MAP sensor
Speed density systems do their work first by measuring the temperature of the inlet air and then the manifold pressure via a manifold air pressure sensor, or MAP sensor. They then calculate a density of air with which the ECU can calculate how much fuel it needs.
What affects injector pulse width?
Varying loads, speeds, and temperature conditions require the fuel delivery to be adjustable, and that is accomplished through changes to injector pulse width. The typical injector pulse width for an idling engine at normal operating temperature is between 2.5 and 3.5 ms.
Which fuel injection system uses the map as the primary sensor to determine fuel delivery?
The two methods of fuel-injection control are the speed-density system, which uses the MAP to measure the load on the engine, and the mass airflow, which uses the MAF sensor to directly measure the amount of air entering the engine.
Which of the following sensors provides information that is the most critical for proper air fuel mixture as well as ignition timing?
oxygen sensor
The oxygen sensor provides information about the fuel mixture. The PCM uses this to constantly re-adjust and fine tune the air/fuel ratio. This keeps emissions and fuel consumption to a minimum. A bad O2 sensor will typically make an engine run rich, use more fuel and pollute.
Which sensor is used to calculate the amount of fuel required?
A mass (air) flow sensor (MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine.
What makes the injectors pulse?
The (PCM) uses the trigger signal from the crankshaft position sensor; and/or camshaft position sensor to pulse the injectors.
What is the difference between the pulse width and the duty cycle of an injector?
The Injector Duty Cycle (IDC) is basically the percentage of time an injector is energised (open) during an engines cycle i.e. 0% IDC injector is off, and 100% IDC the injector is permanently open. The Injector Pulse Width is the time an injector is energised (open).
What makes injectors pulse?
When testing a MAP sensor The technician should first check the?
With the ignition on, the MAP sensor output should be around 5 volts. Start the engine and check the reading; at idle, the MAP sensor should read 1 to 2 volts. This indicates the MAP sensor is responding to changes in vacuum. Digital MAP sensors are best tested with an oscilloscope.
What is injector pulse width?
Injector pulse width is the amount of time, measured in milliseconds (ms), that a fuel injector stays open (delivers fuel) during a cylinder intake cycle. The typical injector pulse width for an idling engine at normal operating temperature is between 2.5 and 3.5 ms.
How does the ECM adjust the fuel injectors pulse width?
The ECM will adjust the fuel injectors pulse width accordingly. Note: Baro and MAP sensors look and work in a similar fashion, therefore only one of the two sensors will be found in one engine. Usually found either bolted on the intake manifold or linked with a vacuum pipe from the intake manifold.
What do the X and y axis mean on a fuel injector?
The X Axis is the actual pulse width applied to the injector in milliseconds, and the Y axis is the volumetric flow, in microliters, for a single pulse. In simpler terms, the graph shows how much fuel will be injected into the cylinder for a given pulse width.
What are the four in put sensors and their output devices?
What are the four in put sensors MAPP, M AF, ECT, 02S, VS What are the four output devices Fuel injectors, blower motor control, transmission shifting, idle speed control, e-vap solenoid What unit of electricity is used as a signal for a computer Volt Before basic computer functions include what Input, processing, storage, output