How do you bench test a diesel injector?

Connect the clip of the automotive test light to the negative terminal of your vehicle’s battery. Then take the pointed tip of the test light and touch it to the small bit of exposed wire on the fuel injector connector. The test light should light up if the injector is functioning properly.

How does a common rail injector work?

Abstract: In the common rail system, fuel is distributed to the injectors from a high pressure accumulator, called the rail. The rail is fed by a high pressure fuel pump. The pressure in the rail, as well as the start and end of the signal that activates the injector for each cylinder are electronically controlled.

What are the components in a typical high pressure common rail system?

Abstract: The components of a common rail fuel injection system include the rail, a high pressure pump and fuel injectors. Radial, unit and in-line pumps are used in commercial common rail systems.

How much pressure does a common rail diesel have?

2,000 BAR – 29,000 PSI
Common rail direct fuel injection is a direct fuel injection system for petrol and diesel engines. On diesel engines, it features a high-pressure (2,000 BAR – 29,000 PSI) fuel rail feeding individual solenoid valves, as opposed to a low-pressure fuel pump feeding unit injectors or pump nozzles.

How do you check the resistance of a diesel injector?

With the engine off, unplug the electrical connector of the injector you need to test. Set your digital multimeter to an appropriate value on the Ohms scale according to the resistance specifications for your particular fuel injector (usually, you need to set the multimeter to read at least up to 30 Ohms).

What is common rail injector tester?

The Common Rail Injector Tester (CRIT100) provides the right driving signals and parameters needed for proper assessment of the following injector parameters: delivery, back leak, injection quality, spray pattern, chattering, pre-injection and etc.

How many sensors are installed in common rail?

It’s a three-wire sensor: +5V powered from the ECM, output signal and ground. Output range is 0.5 ÷ 4.5V for Bosch, Delphi and Siemens rail pressure sensors and 1.0 ÷ 4.2V – for the Denso sensors.

How does a common rail pressure sensor work?

It is a part of vehicle’s fuel system and designed to monitor the fuel pressure that is present at the fuel rail. The sensor sends this signal to the ECU, which then uses it to make adjustments to the vehicle’s fuel and timing. When the sensor has an issue it can cause problems with the performance of the vehicle.

Why offer a common rail diesel system test facility?

Common rail diesel systems are rapidly increasing in the market, with all new diesel vehicles being equipped with a Common rail diesel system there is an increasing opportunity for you to offer a test and repair facility.These systems run at extreme pressures and require exact settings to operate at optimum efficiency.

How do you test and repair a common rail fuel system?

Testing and repair of a common rail fuel system requires special diagnostic tools to carry out the necessary tests and confirm areas where faults exist. The CRDi provides accurate diagnostics of many areas of the diesel fuel system essential to correctly diagnose where faults exist.

What precautions should I take when using common rail fuel?

High pressures are developed in Common Rail systems. Necessary precautions should be taken. Dirt particles introduced into the fuel system can damage pumps and injectors. Ensure you always carry out repairs in a clean environment.

What should I check before replacing diesel injectors or pumps?

Also, before replacing diesel injectors or pumps it is advisable to carry out additional checks to confirm the diagnosis. The CRDi provides accurate diagnosis of many areas of the diesel fuel system including injector leak back and imbalance, high pressure pump results and low pressure or vacuum supply lines and primer pumps.