John Deere 001547.03 – ATC: High Voltage on the Air Conditioning Evaporator Probe Roof Module (ATC)

The ClimaTrak™ Automatic Temperature Control (ATC) unit has detected a voltage higher than the normal operating range (typically over 5 volts) from the air conditioning evaporator temperature sensor. This indicates an abnormal electrical condition, most likely an open circuit or a short circuit to a power source in the sensor's wiring. This fault will restrict the automatic temperature control functions of the air conditioning system.

• 6120
• 6220
• 6320
• 6420
• 6230
• 6330
• 6430
• 7220
• 7320
• 7420
• 7520
• 7630
• 7730
• 7830
• 7930
• 8120
• 8220
• 8320
• 8420
• 8520
• 8130
• 8230
• 8330
• 8430
• 8530
• 9220
• 9320
• 9420
• 9520
• 9620
• 9330
• 9430
• 9530
• 6R
• 6105R
• 6120R
• 7350
• 4730
• 4830

1. 1

   Visually inspect the wiring harness and connector leading to the evaporator temperature sensor for chafing, corrosion on pins, or loose connections

2. 2

   Test the sensor circuit for continuity and check for any shorts to a power source

3. 3

   Perform a sensor resistance test by disconnecting the sensor and measuring resistance across its terminals

4. 4

   Apply heat (hairdryer) or cold (ice) to the sensor to verify the resistance reading changes; infinite resistance or lack of change indicates a faulty sensor

5. 5

   Run the A/C System Temperature Sensor diagnostic test (if available on the display) to verify voltage and resistance are within OEM specifications

1. 1

   Prepare machine for service

   Shut off the engine, set the parking brake, remove the key, and disconnect the battery ground cable.

2. 2

   Locate the sensor

   Access the evaporator temperature sensor within the HVAC housing. This typically requires removing cab panels around the roof module or behind the operator's seat, depending on the tractor model.

3. 3

   Remove faulty sensor

   Carefully disconnect the electrical connector. Unclip or gently pull the sensor out from the evaporator core fins.

4. 4

   Install new sensor

   Insert the replacement evaporator temperature sensor into the exact same position in the evaporator core.

5. 5

   Reassemble components

   Reconnect the wiring harness to the new sensor and reinstall all removed cab panels and components.

6. 6

   Clear codes and verify repair

   Reconnect the battery, start the tractor, and use the diagnostic display to clear stored ATC fault codes. Operate the ClimaTrak™ system to ensure proper function and verify the code does not return.