Troubleshooting guide

SERIES 60 EGR TECHNICIAN'S GUIDE

Boost Mode Operation

A typical Boost Mode operation c onsists 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 a mbient humidity to prevent condensation of EGR gases in the i ntake 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