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Are fuel injectors controlled by an onboard computer?
The sole purpose of a fuel injector is to inject the correct amount of fuel into the engine to create the optimal air/fuel ratio required for easy ignition. The injectors are electronically-controlled by the onboard computer.
Does the OBD port have constant power?
The connector will always have power on these two pins regardless of the key position, and when you plug a device into the port it will have power and may come on by itself (many scanners do this). However, this is only power and you won’t be able to communicate with the car.
Can you start a car through obd2?
3 Answers. Ultimately the answer is yes you can. To qualify this answer, though, you can only control some things, but not all things, then only on some vehicles. You can do simple things through the port, such as turn the A/C pump on, or any other thing which is controlled by the computer (PCM).
Where is the OBD port in my car?
Where is the OBD2 port? The OBD2 port location can vary depending on your car model. However, it is usually found within reach of the driver, underneath the steering wheel.
What triggers fuel injection?
The amount of fuel injected is controlled by a flap valve located in the engine’s air intake. The flap sits beneath the control unit and rises and falls in response to airflow – as you open the throttle, the ‘suck’ from the cylinders increases the airflow and the flap rises.
What can cause fuel injectors not to spray?
If it does not spray, the problem is the injector or no fuel pressure. The injector should have around 1.3 ohms of resistance, if it is open or zero resistance, it is bad. The injector could be totally clogged as well. Fuel pressure should be 9 to 13 psi.
What is the purpose of OBD?
On-board diagnostics (OBD) refers to the automotive electronic system that provides vehicle self-diagnosis and reporting capabilities for repair technicians. An OBD gives technicians access to subsystem information for the purpose of performance monitoring and analyzing repair needs.
How does the OBD 2 fuel injection system work?
From a fuel delivery perspective, all OBD II vehicles use fuel injection to measure, atomize and distribute fuel to the engine’s cylinders. Most OBD II systems are configured with multi-point injection systems.
Can the OBD-II port be used to control the vehicle?
The OBD-II port can definitely be used to access and control many of a vehicles systems. That’s not what it was designed for but yes it’s possible.
How does the CPI fuel injection system work?
Though the CPI system supplies fuel to each of the engine’s intake ports like other multi-port fuel injection systems, it has only one centrally located fuel injector, called the MAXI injector. Some bean counter at GM probably came up with the idea as a way to reduce costs.
What kind of fuel injection does a GMC use?
Back in 1992, General Motors introduced a new type of fuel injection system known as “Central Port Injection” (CPI), which GM also refers to as “Central Multi-point Fuel Injection” (CMFI). The system was used on 4.3L V6 Vortec engines through 1995, and was redesigned in 1996 and renamed “Central Sequential Fuel Injection” (CSFI).