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5130, 5130B and 5230 Excavators, 784B, 785B, 785C, 789B, 789C, 793B and 793C Off-Highway Truck/Tractors and 992G, 994 and 994D Wheel Loaders Vital Information Management System (VIMS) Caterpillar


CID 0821 FMI 06 Display Power Supply Current Above Normal - Test

Usage:

793B 1HL
This diagnostic code is recorded when the VIMS main module reads the current of the display power supply circuit and the current is above normal. Normal voltage of the display power supply is 9.0 ± 0.5 DCV.

  1. CHECK VOLTAGE AT THE MAIN MODULE.

    1. Use the 7X-1710 Cable probes to measure the voltage at the main module connector from contact 25 to contact 37. Do NOT disconnect the harness from the main module.

      Expected Results:The voltage is 9.0 ± 0.5 DCV.

      Results:

      • OK - Voltage is 9.0 ± 0.5 DCV. The voltage of the display power supply is correct. Check the message center for the same diagnostic code. If the same diagnostic code is still present the main module has failed. Replace the main module. Refer to the Testing and Adjusting, "Module-Replace" section. STOP.

      • NOT OK - Voltage is NOT 9.0 ± 0.5 DCV. The voltage of the display power supply is NOT correct. Proceed to 2.

  2. DISCONNECT THE DISPLAY MODULES.

    1. Monitor the voltage at the main module connector contact 25 to contact 37.

    2. Disconnect the display module from the machine harness one at a time.

      Expected Results:The voltage is 9.0 ± 0.5 DCV.

      Results:

      • OK - Voltage is 9.0 ± 0.5 DCV. The voltage of the display power supply is correct. The display module that was just disconnected has failed. Replace the VIMS module. Refer to the Testing and Adjusting, "Module-Replace" section.

      • NOT OK - Voltage is NOT 9.0 ± 0.5 DCV. The voltage of the display power supply is NOT correct. Repeat 2. If the voltage of the display power supply is NOT 9.0 ± 0.5 DCV after disconnecting all the display modules. Proceed to 3

  3. CHECK FOR SHORT TO GROUND

    1. Turn the key start switch and the disconnect switch to OFF position.

    2. Disconnect the machine harness from the VIMS main module and the display modules.

    3. Measure the resistance between frame ground and the display power supply circuit connectorcontact 25.

    4. Measure the resistance between display module ground contact 37 and the display power supply circuit connector contact 25.

      Expected Results: The resistance is greater than 5000 ohms.

      Results:

      • OK - Resistance is greater than 5000 ohms. The harness circuit resistance is correct. The VIMS main module has failed. Replace the VIMS module. Refer to the Testing and Adjusting, "Module-Replace" section.

      • NOT OK Resistance is less than 5000 ohms. The machine harness has failed. Repair the machine harness or replace the machine harness.

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