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 03 Display Power Supply Voltage Above Normal - Test

Usage:

793B 1HL

This diagnostic code is recorded when the VIMS main module reads the voltage of the display power supply circuit and the voltage is above normal. The normal voltage of display power supply is 9.0 ± 0.5 DCV.

CHECK THE VOLTAGE AT MAIN MODULE CONNECTOR.
1. Check the voltage at the connector of the main module from contact 25 to contact 37. Use the 7X-1710 Cable probes to make the measurement. Do NOT disconnect the machine harness from the VIMS main module.
  Expected Results:The voltage is 9.0 ± 0.5 DCV.
  Results:
  - OK - Voltage is 9.0 ± 0.5 DCV. The display power supply voltage is correct. Check the message center for the same diagnostic code. If the diagnostic code is still present the main module has failed. Replace the main module. Refer to theTesting 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.
CHECK THE HARNESS FOR A SHORT TO +BATTERY.
1. Disconnect the machine harness from the VIMS main module.
2. Measure the voltage at the machine harness connector of the VIMS main module between connector contact 25 to connector contact 37.
  Expected Results: The voltage is 0.0 ± 0.5 DCV.
  Results:
  - OK - Voltage is 0.0 ± 0.5 DCV. The voltage is correct. The VIMS main module has failed. Replace the VIMS main module. Refer to the Testing and Adjusting, "Module-Replace"section.
  - NOT OK - Voltage is NOT 0.0 ± 0.5 DCV. The harness has failed. Repair the machine harness or replace the machine harness. STOP.