John Deere 000170.03 – ATC: Inside Air Temp Sensor High Voltage

The Automatic Temperature Control (ATC) unit, also known as the ClimaTrak controller, has detected a voltage reading of over 5 volts from the inside cab air temperature sensor. This high voltage condition typically indicates that the sensor's signal circuit is either open or has been shorted to a power supply wire, causing the controller to restrict temperature control functions.

• 6020
• 6120-6420
• 6020S
• 6920
• 6920S
• 7720
• 7820
• 7920
• 8120
• 8220
• 8320
• 8420
• 8520
• 8130
• 8230
• 8330
• 8430
• 8530
• 8230T
• 8330T
• 8430T
• 9230
• 9330
• 9430
• 9530
• 9630
• 6R Series
• 7R Series
• 8R Series

1. 1

   Ensure the cab's recirculation air filter is clean and not plugged

2. 2

   Check the cleanliness of the air conditioning condenser at the front of the tractor

3. 3

   Verify the cab temperature sensor (often located behind the instructional or training seat) is not covered or obstructed

4. 4

   Inspect the wiring harness between the ATC controller and the sensor for damage, and perform continuity tests

5. 5

   Test the sensor's resistance at different temperatures; a reading of zero or infinite resistance indicates a faulty sensor

6. 6

   Perform a basic circuit test by disconnecting the wire at the sensor and grounding it; if the system reading swings to the opposite extreme, the wiring and controller are likely okay, pointing to a bad sensor

1. 1

   Gain Access

   Park the machine safely and turn it off. Locate the inside air temperature sensor, which is typically found behind the training seat in many tractor models.

2. 2

   Visual Inspection

   Inspect the sensor and its connector for any signs of damage, corrosion, or loose connections.

3. 3

   Test the Circuit

   Disconnect the sensor. Turn the key to the 'ON' position without starting the engine. Measure the voltage at the sensor's connector. A high voltage reading (above 5V) on the signal wire confirms a short to power. If there is no voltage, check for an open circuit between the controller and the sensor connector.

4. 4

   Test the Sensor

   If the wiring is confirmed to be good, test the sensor itself. Using a multimeter, measure the resistance across the sensor's terminals while gently warming it. The resistance should change smoothly. If there is no change, or if the resistance is infinite (open) or zero (shorted), the sensor is faulty.

5. 5

   Replace the Component

   If the wiring is damaged, repair or replace the harness section. If the sensor is determined to be faulty, replace it with a new OEM part.

6. 6

   Clear Codes

   After the repair, reconnect the battery, start the machine, and clear the diagnostic trouble codes. Operate the ClimaTrak system to verify that the repair was successful and the code does not return.