John Deere CCU524224.14 – CCU: PTO Switch Signal Fault

The Central Control Unit (CCU) has detected an illogical signal from the PTO switch. This typically occurs when the PTO switch is left in the 'on' position during vehicle startup, causing the system to receive a command to engage the PTO before the engine is running. As a safety measure, the system flags this as a fault and disables the rear PTO. Other potential triggers include conflicting signals from multiple PTO switches or the Intelligent Implement Management (IMS) system turning off the PTO.

• 5045E
• 5055E
• 5085E
• 5090E
• 5090EL
• 5100E
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7630
• 7730
• 7810
• 7820
• 7830
• 7930
• 8000 Series

1. 1

   Turn all PTO switches to the 'OFF' position and restart the vehicle to clear potential temporary startup conditions

2. 2

   Visually inspect the PTO switches for physical damage or signs of being stuck

3. 3

   Inspect the wiring harnesses connected to the PTO switches, PTO control module, and PTO solenoid for damage, corrosion, or loose connections

4. 4

   Test the PTO switch for continuity using a multimeter (should be open/no continuity when OFF, closed circuit when ON)

5. 5

   Check voltage at the PTO clutch connector with the key in 'RUN' and PTO switch engaged (should read approximately 12 volts; 0V indicates a switch, fuse, or seat switch issue)

6. 6

   Test the PTO solenoid by listening for an audible click when engaged, or by briefly applying 12V direct power to see if it actuates

7. 7

   Check the hydraulic fluid level and condition, as low or contaminated fluid can affect PTO operation

1. 1

   Prepare machine for service

   Park the tractor on a level surface, set the parking brake, turn off the engine, remove the key, and disconnect the negative battery terminal.

2. 2

   Replace PTO switch

   If the switch failed the continuity test, access the rear of the switch under the dashboard. Disconnect the wiring harness, release the retaining clips, push the switch out, and install the replacement.

3. 3

   Replace PTO solenoid

   If the solenoid fails to actuate, locate it on the rear of the transmission housing. Clean the area, disconnect the electrical connector, and unscrew the solenoid (expect hydraulic fluid loss). Install the new solenoid and tighten.

4. 4

   Repair wiring harness

   If wiring damage or 0V at the clutch connector was found, repair or replace the affected section of the harness. Ensure all connections are clean and secure.