New Holland ENG 3377 – Engine Controller: Constant Engine RPM Switch Detected but Option Not Enabled

Configuration mismatch within the machine's electronic system. The Engine Control Module (ECM) is receiving a physical electrical signal indicating that a Constant Engine RPM Switch is present and being actuated, but the software configuration inside the engine controller does not have this specific feature enabled.

• T8.xxx Series
• CR9090
• CX8080 Elevation
• CX8090 Elevation
• Magnum 235 - 340 (Series 4)

1. 1

   Physically inspect the cab and operator controls to determine if the machine is actually equipped with a Constant Engine RPM Switch.

2. 2

   If the switch is physically present, verify the Engine Controller's software settings to confirm whether the power management/constant RPM option is turned off.

3. 3

   If the machine is not equipped with this switch, check the engine wiring harness for a short circuit that may be sending a false signal to the ECM.

1. 1

   Connect diagnostic tool

   Connect the dealer diagnostic service tool to the machine's CAN-bus port.

2. 2

   Access configuration menu

   Access the Engine Controller (ECM/EDC) configuration menu.

3. 3

   Enable software feature

   If the switch is installed: Navigate to the engine options and enable the 'Constant Engine RPM' feature in the software.

4. 4

   Repair wiring harness

   If the switch is NOT installed: Trace the wiring harness circuit designated for the Constant Engine RPM switch. Locate and repair any shorts to power or ground that are tricking the ECM into detecting a switch.

5. 5

   Clear fault codes

   Clear the fault codes from the Engine Controller and cycle the key to verify ENG 3377 does not return.