TM2361 (24JUN08) 9010-05-21 450DLC Excavator Operation and Tests 062608 PN=269 Theory of Operation P (standard) Mode The function of P mode is to control the engine speed from slow idle to fast idle in response to the position of the engine speed dial. E (economy) Mode The purpose of E mode is to lower engine speed to reduce fuel consumption and noise level. The main controller receives input signals from the engine speed dial, power mode switch, and the pump delivery pressure sensors, then sends a signal via CAN to the ECM to reduce engine rpm when the following conditions are met: • Engine speed above 1580 rpm. • Power mode switch in E mode.
Travel HP (high power) Mode Control The purpose of Travel HP mode is to increase engine speed for faster travel. The main controller uses these input signals from the travel right, travel left pressure sensors, and engine speed dial to determine appropriate engine speed. The main controller then sends a signal via CAN communication to the ECM to increase engine speed when the following conditions are met: • Engine speed dial set at 1070 rpm or faster. • Travel function is operated. Auto-Idle Control The purpose of auto-idle control is to lower engine speed to reduce fuel consumption and noise levels while engine is running and no hydraulic function actuated.
The main controller uses these input signals to determine appropriate engine speed: • Engine Speed Dial (R15) • Auto/Idle Switch (S8) • Boom Up Pressure Sensor (B52) • Boom Down Pressure Sensor (B53) • Arm Out Pressure Sensor (B50) • Arm In Pressure Sensor (B51) • Bucket Dump Pressure Sensor (B55) Continued on next page JC89288,0000192 –19–27JAN06–3/4 9010 05 21