What diagnostic tool is commonly used to test fuel injectors?

The multimeter or fuel injection tester is the primary diagnostic tool used to test fuel injectors. This tool helps assess the electrical resistance and functionality of the injectors, ensuring that they are opening and closing properly during operation. By using a multimeter, a technician can measure the resistance of the fuel injector coils to verify that they are within the manufacturer’s specifications. Additionally, a fuel injection tester can simulate various conditions to evaluate injector performance under different scenarios.

The torque wrench, while important for tasks that require tight fastening, does not directly relate to testing the functionality of fuel injectors. An odometer measures vehicle mileage and has no relevance to fuel injector diagnostics. A pressure gauge might be useful in specific contexts related to fuel pressure in the system, but it does not evaluate the effectiveness of the injectors themselves in terms of operation and electrical performance. Thus, the multimeter or fuel injection tester is the most appropriate tool for this purpose.