The
(PCM)
uses the trigger signal from the crankshaft position sensor; and/or camshaft position sensor to pulse the injectors.
What causes no fuel injector pulse?
When these
fuses blow, the system they support stops working, and the engine stops running
. As a result, there is no injector pulse while craking. … In case of that, there is no injector pulse or spark, which means that if your ECU has failed in operating in this case you have to get your ECU changed or visit an expert.
What controls the injector pulse with on a modern fuel injected vehicle?
The amount of fuel supplied to the engine is determined by the amount of time the fuel injector stays open. This is called the pulse width, and it is controlled by
the ECU
. The injectors are mounted in the intake manifold so that they spray fuel directly at the intake valves.
What determines 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.
What causes high injector pulse?
When the fuel injector flow becomes restricted or blocked the engine controller will attempt to increase the fuel flow by opening the injector for a longer period of time
, increasing the injector pulse width.
What causes no injector pulse and no spark?
With no spark and no injector pulse, you could have
a bad crank sensor or a bad IC module
, or there could be a problem with the wiring in between them…..
How do I know if my fuel injectors are not working?
An abrupt loss of engine power
is a somewhat obvious sign of a fuel injector failure. If the fuel injector is clogged, the fuel supply will be irregular too. When the fuel level fluctuates drastically, the high and low rpm’s will cause the engine to move in surges rather than slow and gradual movements.
What is the most common cause of injector failure?
So, the most common cause of leaky injectors is;
the failure of the O-ring, where the injector meets the fuel rail
. The O-ring can become, hard and brittle, from the heat of the engine. If it breaks, then fuel can leak out, over the engine. The other way an injector will leak is if, the injector body or nozzle cracks.
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 is injector duty cycle?
The amount of time an injector is turned on and delivering fuel
is known as the duty cycle. This is measured as a percent, so 50% duty cycle indicates that the injector is held open and held closed for an equal amount of time. … Injector duty cycle should usually not exceed 80% in a running engine at any time.
What is injector flow rate?
Fuel Injectors are sized by their flow rate. Flow rate is
a measurement of how much fuel can be delivered over time
. It is listed in pounds per hour (lbs./hr.) or cubic centimeters per minute (cc/min.). The right size injector can supply enough fuel under full load conditions at an 80% duty cycle.
Does crankshaft position sensor control injector pulse?
Crank Position Sensor,
does control injector pulse
AND ignition spark. Often these little buggers become intermittant. A little tap with a spanner will usually bring the sensor back online, but suggest to replace it ASAP.
Does the ECU control the fuel injectors?
The ECU is the brain of the operation. It uses engine RPM and signals from different sensors to meter the fuel. It does this by telling
the fuel injectors when and how long to fire
. The ECU often controls other functions like the fuel pump and ignition timing.
Why are my injectors not getting power?
No power to the fuel injectors can be caused by a few things. … A no start condition can also be caused by a
faulty fuel pump
, or any of the associated components. I would verify that the pump is operating, and that it is providing the required pressure for correct engine operation.
