Generator Set Control Panel for Switchgear Conversion Caterpillar


CID 0821 FMI 03 Display Power Supply Voltage Above Normal - Test

Usage:

3412C 4BZ



Illustration 1g00565164

This diagnostic code is recorded when the main display module reads the voltage of the display power supply circuit as above normal. Normal display power supply voltage is 9.0 ± 0.5 DCV. The schematic that is shown above represents a typical installation of the component. Verify the connector contact and wire numbers by using the Electrical System Schematic for the engine that is being serviced.

  1. Check The Voltage At The Main Display Module.

    1. Turn the "ECS" switch to the COOLDOWN/STOP position.

    1. Use the 7X-1710 Multimeter Probe Group. Check the voltage at the connector for the main display module. Measure the voltage from the contact 34 to contact 2 (ground).

    1. DO NOT disconnect the harness from the Main Display Module.

    1. The correct voltage should measure 9.0 ± 0.5 DCV.

      Expected Results: The voltage that is measured is 9.0 ± 0.5 DCV.

      Results:

      • OK: The voltage is 9.0 ± 0.5 DCV. The display power supply voltage is correct. Check the main display module for the same diagnostic code. If the service code indicator is still ON, the main display module is faulty. Replace the module. See Testing and Adjusting, "Module - Replace". STOP.

      • NOT OK: The voltage is NOT 9.0 ± 0.5 DCV. The display power supply voltage is NOT correct. Proceed to Step 2.

  1. Check The Harness For A Short To The +Battery.

    1. Turn the "ECS" switch to the OFF/RESET position.

    1. Disconnect the engine harness from the main display module.

    1. At the engine harness connector for the Main Display Module, measure the voltage from the connector Contact 34 to Contact 2 (ground).

      Expected Result: The voltage that is measured is 0.0 ± 0.5 DCV.

      Results:

      • OK: The voltage is 0.0 ± 0.5 DCV. The voltage is correct. The main display module is faulty. Replace the module. See Testing and Adjusting, "Module - Replace". STOP.

      • NOT OK: The voltage is NOT 0.0 ± 0.5 DCV. The harness is faulty. Repair the harness or replace the harness. STOP.

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