Case IH 16130 – ATC (Automatic Temperature Control) / Air Conditioning Controller: Low pressure switch (+) input shorted to power (or shorted with power supply)

The A/C low pressure switch monitors system pressure and cuts the electrical loop to the compressor clutch if pressure drops too low. Code 16130 indicates that the controller is detecting a short circuit to a 12V power source on the positive (+) input circuit of this switch.

• Puma/Mid Range Magnum
• Maxxum
• Puma series (115 through 240)
• Magnum series
• Maxxum series
• Steiger series
• CVX models
• Axial-Flow Combines

1. 1

   Visually inspect the A/C low pressure switch electrical connector and wiring harness for melted insulation, chafing, or pinched wires.

2. 2

   Perform a voltage check by disconnecting the harness from the switch, turning the key ON (engine off), and probing the positive signal wire. A 12V reading indicates a short in the harness.

3. 3

   Test the low pressure switch for internal continuity to ensure it is not internally shorted to its housing.

4. 4

   Hook up A/C manifold gauges to verify the system has the correct static refrigerant charge.

1. 1

   Disconnect Power

   Turn off the machine and disconnect the negative battery cable to prevent accidental electrical spikes during repair.

2. 2

   Harness Repair (If Applicable)

   If the diagnostic checks revealed 12V on the signal wire due to a harness short, trace the wire back to the ATC module. Locate the chafed or melted section, cut out the damaged wire, and repair it using weather-sealed heat-shrink butt connectors.

3. 3

   Switch Replacement (If Applicable)

   Locate the A/C low pressure switch on the A/C line. Unplug the electrical connector. Unthread the faulty switch (Note: Most modern Case IH A/C lines feature a Schrader valve beneath the pressure switch, allowing you to unscrew the switch without discharging the A/C system's refrigerant. Verify this on your specific model before fully unthreading). Thread the new OEM switch onto the fitting (Thread size is typically M10 x 1.25) and tighten securely. Reconnect the electrical harness.

4. 4

   Clear Codes

   Reconnect the battery. Turn the key ON and use the tractor's diagnostic menu (or a service tool) to clear the ATC 16130 fault code.

5. 5

   Test Operation

   Start the tractor, turn on the A/C, and verify that the compressor clutch engages properly and the fault code does not return.