SERIES 60 EGR TECHNICIAN'S GUIDE Boost Mode Operation A typical Boost Mode operation consists of: Accelerating a vehicle from stationary position and shifting up through the transmission gears. Performing engine brake operation. The vehicle is at or above 6500 ft of altitude. High ambient humidity to prevent condensation of EGR gases in the intake manifold. EGR Valve Activated by DDEC IV Transition from Boost to EGR Mode Initiation of EGR requires minimum engine speed and boost pressure (air flow) in order to transition into EGR mode without an abrupt drop in air/fuel ratio.
Once minimum RPM and boost levels are attained the ECM sends a signal via PWM#2 to initiate the valve opening event by providing air pressure to the EGR actuator. All information subject to change without notice. (Rev. April 2004) 3-5 7SE60 0404 Copyright © 2004 DETROIT DIESEL CORPORATION