Corrrect ECM Wiring Harness Problem

Replace the Fan Control Board / Correct the Pin Connection Problem / or Replace the Wiring Harness.

 It’s important to check the pin connections on the board as well as the wiring harness  for proper voltage and/or continuity. Pin control voltage requirements are specific to ECM motor and manufacturer and equipment.  Utilize the specific ECM motor guidelines from the manufacturer, or use an ECM motor tester.  …  Use caution when searching for control signal to an ECM module as the voltage may be ac, dc, or serial.  Programed time delays and or ramping cycles may also create a delayed or inconsistent signal.

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2 ECM Low Voltage