Case IH 3510-03 - VCM – VCM: 5V sensor supply #2 voltage high

The control module has detected that the voltage on the #2 5-volt sensor supply circuit has exceeded the maximum allowable threshold (typically > 5.25V or 5.26V). This condition is usually caused by a short to a higher voltage source (such as the 12V battery power) in the wiring harness, a shorted sensor on that specific circuit, or an internal failure within the control module itself.

• MAGNUM AFS Connect
• Steiger AFS Connect
• Optum
• Puma

1. 1

   Turn the ignition OFF and the engine OFF.

2. 2

   Disconnect the main harness connector (e.g., A5501) from the VCM.

3. 3

   Measure the resistance between the disconnected connector pins and the corresponding female sockets on the harness. Resistance should be less than 5 ohms. If not, there is a wiring issue.

4. 4

   Turn the ignition ON (Engine OFF). At the connector of the sensors on the #2 supply circuit, measure the voltage between the 5V supply (+) and return (-) sockets.

5. 5

   Monitor the voltage. If the voltage measures higher than 5.26V, there is a short to a higher voltage source.

6. 6

   Disconnect the sensors on the #2 5V supply circuit one at a time. If the voltage drops back to a normal 5V after unplugging a specific sensor, that sensor is internally shorted.

1. 1

   Repair the Harness

   If the diagnostic checks reveal a short to battery voltage (B+) on the signal or supply wire in the harness, locate the chafed or melted section of the wiring harness and repair the shorted wire.

2. 2

   Replace Faulty Sensor

   If disconnecting a specific sensor caused the voltage to return to normal, replace that internally shorted sensor.

3. 3

   Replace the VCM

   If the wiring harness tests perfectly (no shorts to power) and all sensors are functioning, but the VCM is still outputting an excessively high voltage on the #2 sensor supply circuit, the VCM has suffered an internal hardware failure. Replace the VCM.

4. 4

   Verification

   Reconnect all components, turn the ignition ON, and use the dealer Electronic Service Tool (EST) or the in-cab display to verify that code 3510-03 has changed from 'Active' to 'Inactive'. Clear the code.