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 0263 FMI 03 Sensor Power Supply (8 or 12 DCV) Voltage Above Normal - Test

Usage:

793B 1HL
Note: This procedure can cause new diagnostic codes to be recorded. Ignore these newly created diagnostic codes. Complete this procedure and then clear the diagnostic codes that were created during this procedure.

This failure is recorded when the ECM reads the voltage of the 8 DCV or 12 DCV sensor supply circuit and the voltage is above normal.

  1. CHECK FOR THE CORRECT VOLTAGE AT THE INTERFACE MODULE

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

    2. Check the voltage at the connector of the interface module from contact 26 (sensor supply) to contact 2 (ground). Use the 7X-1710 Cable probes to measure the voltage. Do NOT disconnect the machine harness from the VIMS main module.

      Expected Results : The voltage is 8.0 ± 0.5 DCV or the voltage is 12.0 ± 0.5 DCV.

      Results:

      • OK - Voltage is 8.0 ± 0.5 DCV or 12.0 ± 0.5 DCV . The sensor supply voltage is correct. Check the message center in order to verify that the same diagnostic code is present. If the diagnostic code is still present, the interface module has failed. Replace the module. Refer to the Testing and Adjusting, "Module - Replace" section. STOP.

      • NOT OK - Voltage is greater than 8.0 ± 0.5 DCV or 12.0 ± 0.5 DCV . The sensor supply voltage is NOT correct. Proceed to 2.

  2. HARNESS CHECK FOR SHORT TO THE +BATTERY CIRCUIT

    1. The disconnect switch and the key start switch remain in the ON position.

    2. Disconnect the machine harness from the VIMS interface module.

    3. At the machine harness connector for the VIMS interface module, measure the voltage from connector contact 26 (sensor supply) to contact 2 (ground).

      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 interface module has failed. Replace the VIMS module. Refer to the Testing and Adjusting, "Module - Replace" section. STOP.

      • NOT OK - Voltage is NOT 0.0 ± 0.5 DCV. The harness has failed. The machine harness is shorted to +battery. Repair the machine harness or replace the machine harness. STOP.

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