Case IH 16115 – ATC (Automatic Temperature Control): Evaporator sensor open or shorted to power

The control module detects either infinite resistance (an open circuit, such as a broken wire or unplugged connector) or a short to a 12V power source on the evaporator temperature sensor's signal circuit.

• Puma/Mid Range Magnum
• Maxxum
• Magnum Series (235–340 Series 4)
• Puma Series (140, 165, 180, 195, 210, 225)
• Steiger Series
• MX/TG Series
• Axial-Flow Combines (2144, 2166, 2344, 2366, 2377, 2388, 2577, 2588, 5088, 6088, 7088)
• Cotton Pickers (2155, CPX420, CPX610, CPX620)

1. 1

   Perform a visual inspection of the evaporator temperature sensor connector for corrosion, moisture, or pushed-out pins.

2. 2

   Perform a sensor resistance test by measuring resistance across the sensor pins (infinite resistance indicates an open/faulty sensor).

3. 3

   Perform a harness voltage check with ignition ON by measuring voltage on the sensor harness connector signal wire to ground (12V+ indicates a short to power).

4. 4

   Perform a harness continuity check with ignition OFF by disconnecting the ATC module and checking continuity on signal and ground wires between the sensor and ATC module.

1. 1

   Power Down

   Turn off the machine and disconnect the battery ground cable to protect the ATC module during repair.

2. 2

   Access the Sensor

   Remove the necessary cab interior panels or HVAC access covers to reach the evaporator core housing.

3. 3

   Replace or Repair

   If the sensor failed the resistance test: Pull the old temperature sensor probe out of the evaporator fins and carefully insert the new sensor probe into the exact same location. If the wiring harness failed: Locate the break or the short-to-power in the harness, splice and solder the broken wire, or replace the damaged connector pigtail, and wrap the repair in heat-shrink tubing and electrical tape.

4. 4

   Reassembly

   Plug the sensor connector back into the harness. Reinstall all HVAC covers and cab panels.

5. 5

   Clear Codes

   Reconnect the battery, turn the ignition ON, and use the tractor's diagnostic display or a Jaltest/Case IH diagnostic tool to clear the inactive 16115 fault code.

6. 6

   Test Operation

   Run the engine and turn the A/C on maximum cooling. Verify that the compressor clutch engages and that the system does not freeze up or throw the code again.