Fuel Injector Balance Test with Scan Tool
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Fuel Injector Balance Test with Scan Tool
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Circuit/System Description
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When conditions arise in cylinder balancing, a scan tool output control test function is provided to help in locating the cause. A compression test can be used to decide whether the cause should be attributed to the engine or the injection system. Once the condition has been limited to the injectors, further tests can determine which injector is responsible for the condition in cylinder balancing. The test consists of 2 modes (A, B), which are conducted in different test conditions.
Using a scan tool, perform the Fuel Injector Balance test following the instructions.
Mode A
Quantity correction output by selected cylinder. In this test mode, the engine is running with the fuel balancing control correction values enabled. The correction quantity shows an offset, which is added to the injected quantity to establish a vibration-free running of the engine. The cylinder selective engine speed is also provided. A higher cylinder balancing quantity correction shows an injector, which needs greater time to inject an amount of fuel to produce the requested torque.
Mode B
Outfeed of rotational speeds for selected cylinders for balancing quantities during cylinder shut-off. In this test mode, the fuel balancing control correction values are enabled when the engine is running. The cylinder selective engine speed is provided and the engine running behavior without Fuel Balancing Control values can be monitored.
