John Deere 000158.03 – CCU: High Ignition Supply Rear Chassis Module Detected

The switched power supply to a specific control module has exceeded its normal operating voltage, specifically registering over 16 volts. This indicates an abnormal condition related to the ignition supply in the rear chassis module or other control units, typically caused by an overcharging alternator, poor ground connections, or battery issues.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 9230
• 9330
• 9430
• 9530
• 9630
• 204L
• 304L

1. 1

   Visually inspect the area around the batteries and alternator for any signs of damage, corrosion, or accumulated debris

2. 2

   Inspect the battery terminals for corrosion and ensure they are tight, and check the battery cables for any damage or loose connections

3. 3

   Inspect and clean the main ground connections from the battery to the chassis, as a poor or broken ground connection can cause voltage fluctuations

4. 4

   Use a multimeter to test the alternator's output voltage to determine if it is consistently above 16 volts (indicating an overcharging condition)

1. 1

   Address connection issues

   If any loose or corroded battery terminals or ground connections are found, clean and tighten them as necessary to ensure a solid connection for stable voltage.

2. 2

   Replace faulty alternator

   If diagnostic checks confirm that the alternator is overcharging the system (outputting over 16 volts), replace the alternator.

3. 3

   Replace the control module

   If the alternator and all wiring have been checked and are functioning correctly, the issue may lie with the control module itself. Replace the Chassis Control Unit (or other affected module). Note: When replacing a CCU, it is often necessary to program it with the machine's serial number, hours, and other configuration data.