CCU - Engine Speed Fault - RPM Out of Range

John Deere Heavy Equipment Critical Engine

Model: John Deere 6175R Tractor | Code: CCU-04

Applicable Systems
9R Tractor

Symptoms

Engine speed reading outside expected range; engine may not respond to throttle; possible governor fault.

Possible Causes

  • Engine speed sensor signal fault
  • Governor actuator malfunction
  • ECM throttle control fault

Troubleshooting Steps

  1. Step 1: Check engine speed sensor signal via Service Advisor
    RPM reading matches actual
  2. Step 2: Inspect governor actuator operation
    Actuator responds to commands
  3. Step 3: Check ECM throttle output signal
    Output signal within range
  4. Step 4: Replace speed sensor if signal absent
    New sensor signal present
  5. Step 5: Clear code and verify engine RPM control
    RPM follows throttle input

How to Reset

Clear via Service Advisor after repair; may require governor calibration.

Common Replacement Parts

  • Engine Speed Sensor P/N: RE263280
  • Governor Actuator P/N: RE263281

Frequently Asked Questions

  • Q: What is the engine speed sensor location?

    Crankshaft speed sensor at flywheel housing. Some models also have camshaft position sensor on front cover.

Related John Deere Fault Codes

Source: johndeerefaultcodes.com

Category: Heavy Equipment