Case IH 13052 – INST (Instrumentation Controller): Air to Air Intake Temperature sensor voltage is too high (open circuit, short to +V)

This code indicates that the signal voltage from the air-to-air intake temperature sensor is out of range on the high side. The system is detecting either a complete break in the circuit (open circuit) or a wire that has rubbed through and is receiving unintended voltage (short to power).

• MX Magnum
• STX Steiger
• Case IH MX Magnum Series (P.I.N. Z6RZ01001 and above)
• Case IH TG Series (P.I.N. Z6RW01001 and above)
• Case IH Steiger Series
• Case IH Maxxum
• Case IH Puma

1. 1

   Visually inspect the air-to-air intake temperature sensor and its connector for physical damage, corrosion, or backed-out pins.

2. 2

   Perform a sensor resistance test by unplugging the sensor and checking internal resistance with a multimeter (infinite resistance/OL indicates internal failure).

3. 3

   Test the wiring harness from the sensor connector to the Instrumentation Controller for continuity (to rule out an open circuit) and voltage on the signal wire (to rule out a short to power).

4. 4

   Check the Instrumentation Controller if the sensor and wiring harness both test perfectly.

1. 1

   Disconnect Power

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

2. 2

   Locate the Sensor

   Find the air-to-air intake temperature sensor, typically located on the intake manifold or the charge-air cooler piping.

3. 3

   Replace the Sensor (if faulty)

   If the sensor failed the resistance test, unthread the old sensor, clean the mating port, and install the new sensor. Reconnect the wiring harness.

4. 4

   Repair the Harness (if faulty)

   If the wiring harness showed an open circuit or a short to power, trace the harness back to the INST controller. Locate the chafed, broken, or melted section of the wire. Splice and heat-shrink the damaged wire, or replace the affected harness section.

5. 5

   Reassemble and Clear Codes

   Reconnect the battery, turn the key to the ON position, and use a diagnostic tool (or the tractor's onboard diagnostic menu) to clear the inactive 13052 fault code.

6. 6

   Test Run

   Start the engine and verify that the fault code does not return and that the intake temperature readings on the dash/diagnostic tool are within normal operating parameters.