John Deere 001551.04 – ATC: Pressurizer Blower Motor Circuit Voltage Low

This fault code indicates a voltage problem in the pressurizer blower motor circuit of the ClimaTrak system. It is typically caused by a grounded circuit, an open circuit, or a failing fan motor driver unit, which can sometimes be triggered by restricted airflow causing the blower motor to overwork.

• 7715
• 7815
• 7720
• 7820
• 7920
• 8120
• 8220
• 8320
• 8420
• 8520
• 8130
• 8230
• 8330
• 8430
• 8530
• 8230T
• 8330T
• 8430T
• 8310RT
• 8335RT
• 8360RT
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8345R
• 8370R
• 8400R
• 9230
• 9330
• 9430
• 9530
• 9630
• 9470RT
• 9520RT
• 9570RT

1. 1

   Check the cleanliness of the condenser at the front of the tractor and ensure the cab recirculation air filter is not plugged, as restricted airflow can cause the blower motor to overwork and trigger voltage/current faults.

2. 2

   Check the power supply to the fan motor driver unit and inspect relevant fuses (e.g., F05/13 and F05/1) to ensure they are not blown.

3. 3

   Verify if the code is active (often denoted with an 'a' suffix) or stored ('S' suffix). If stored, clear the code and run the HVAC system to see if it regenerates.

1. 1

   Perform preliminary test

   Clear the code. If the diagnostic trouble code is regenerated after a functional test, proceed to electrical testing.

2. 2

   Test power supply

   Check the power supply to the fan motor driver unit using a multimeter.

3. 3

   Perform circuit and harness test

   If the power supply is inadequate, perform a circuit/harness test on the Fan Motor Driver Unit to check for a grounded or open circuit.

4. 4

   Recondition wiring

   Repair any damaged wiring, corroded pins, or loose grounds found in the harness leading to the pressurizer blower motor or the driver unit.

5. 5

   Replace faulty component

   If the wiring harness and power supply are intact but the voltage remains low, the fault lies within the Pressurizer Blower Motor itself or the Fan Motor Driver Unit. Replace the faulty component.

6. 6

   Perform operational check

   After reconditioning the circuit or replacing the motor, perform an operational check of the fan motors to ensure the ATC system functions correctly and the code does not return.