Case IH 3510-04 - VCM – VCM: 5V sensor supply #2 voltage low

The control module is detecting that the 5-volt reference circuit #2—which provides power to a specific bank of 3-wire sensors—has dropped below the acceptable operating threshold (typically below 4.5 VDC).

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• Case IH Puma and CVX Series Tractors

1. 1

   Consult the machine's electrical schematic to identify which sensors are powered by the 5V Supply #2 circuit. Disconnect these sensors one at a time; if the 5V reference voltage returns to normal after unplugging a specific sensor, that sensor is internally shorted.

2. 2

   If all sensors on the #2 circuit are disconnected and voltage remains low, inspect the wiring harness linking the components to the VCM for chafing, pinched wires, or bare spots causing a short-circuit to the chassis ground.

3. 3

   Inspect the VCM and sensor connectors for moisture, corrosion, or bent pins that could bridge the 5V supply to a ground pin.

4. 4

   Disconnect the harness directly at the VCM and measure the voltage at the VCM output pin for the #2 5V supply. If the VCM fails to output approximately 5.0V with the harness completely removed, the VCM has an internal fault.

1. 1

   Power Down

   Turn off the ignition and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Address the Short

   If a sensor is shorted: Remove and replace the faulty sensor. If the harness is shorted: Locate the damaged section of the wiring harness. Cut out the damaged wire, splice in a new section using solder and heat-shrink tubing, and re-loom the harness to prevent future chafing.

3. 3

   Replace the VCM (if internally failed)

   If the VCM is not outputting 5V, remove the mounting hardware and harness connectors. Install the replacement VCM. Note: A new VCM will likely require flashing/calibration using the Case IH Electronic Service Tool (EST) laptop.

4. 4

   Verify Repair

   Reconnect the battery, turn the key to the ON position, and use the diagnostic menu or EST to clear the inactive 3510-04 fault code. Run the machine to verify the code does not return and that sensor readings are accurate.