The ECU uses this value to determine the injector latency and compensate for it. Low ohm injectors have a faster response time than high ohm injectors. So by setting the correct injector resistance will allow the ECU to compensate for injector latency more accurately. This also works in conjunction with battery voltage. As the battery voltage varies from 13.8 volts, the ECU will adjust the injector duty to compensate. This enables the ECU to work with battery voltages from 7 volts up to 16 volts while maintaining a steady air/fuel ratio.
You can do a test by using a Multi-Meter. Unplug the electrical harness of one of the injectors and place the Multi-Meter's probes on the injector pin outs (where the electrical harness clips on) and measure the resistance. When you have a reading adjust this parameter to the closest setting. Note: If you are using staged injectors with a different value of Ohms, set the Ecu to the value corresponding to the primary injectors.
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