John Deere 000170.04 – ATC: Inside Air Temp Sensor Low Voltage Roof Module

The Automatic Temperature Control (ATC) system has detected low voltage (below 0 volts) from the inside air temperature sensor, indicating a short to ground in the sensor's circuit. This fault limits the automatic temperature control functionality, forcing the ClimaTrak™ system to compensate by using the outlet air temperature sensor, which may result in less accurate cabin climate control.

• 9230
• 9330
• 9430
• 9530
• 9630
• 6020
• 6120
• 6220
• 6320
• 6420
• 6420S
• 6520
• 6620
• 6820
• 6920
• 6920S
• 6020SE
• 6120SE
• 6220SE
• 6320SE
• 6420SE
• 6520SE
• 6120L
• 6220L
• 6320L
• 6420L
• 6520L

1. 1

   Visually inspect the cab temperature sensor (often located behind the instructional or operator's seat) and its wiring for frayed wires, loose connections, or physical damage.

2. 2

   Ensure the sensor is not covered or obstructed, as this can affect its operation.

3. 3

   Access diagnostic addresses (e.g., ATC008 or ATC040 on 6120-6420 and 6120L-6520L series) through the tractor's display to check the reading from the inside air temperature sensor.

4. 4

   Test the wiring harness between the sensor and the ATC controller for continuity and shorts to ground.

1. 1

   Safety First

   Park the machine on a level surface, lower all implements to the ground, stop the engine, remove the key, and disconnect the battery ground strap.

2. 2

   Locate the Sensor

   Find the inside air temperature sensor in the cab, typically located behind the training seat or operator's seat. In some wiring diagrams, this sensor is designated as B-104 or B127.

3. 3

   Inspect and Test the Circuit

   Disconnect the sensor and inspect the connector for corrosion or damage. Test the wiring between the sensor connector and the ATC controller for a short to ground.

4. 4

   Replace the Sensor

   If the wiring is intact and the fault persists, the sensor itself is likely faulty. Disconnect the electrical connector, remove the old sensor, and install the new one.

5. 5

   Clear the Fault Code

   After the repair, reconnect the battery, start the tractor, and clear the fault code through the diagnostic system.

6. 6

   Verify the Repair

   Operate the ClimaTrak™ system to ensure it is functioning correctly and that the fault code does not reappear.