Troubleshooting guide

SERIES 60 EGR TECHNICIAN'S GUIDE

Provides EGR transport mechanism in EGR mode

More vane closure increases the EGR flow rate (PWM % is high).

Less vane closure decreases the EGR flow rate (PWM % is low).

Provides enhanced engine brake capability.

The VNT vanes adjust to control the exhaust gas velocity. See Figure 2-7.

Figure 2-7 VNT Vane Position

Va ne Po sition Duri ng Engine Operation

PWM 7%

No air pressure to VNT actuator from the VPOD

Minimum exhaust restriction/Minimum EGR flow while operating in EGR Mode

PWM 50%

Regulated air pressure to the VNT actuator from the VPOD

Moderate exhaust restriction

Increased EGR flow while operating in EGR Mode

PWM 90%:

Maximum regulated air pressure to the VNT actuator from the VPOD

Maximum regulated exhaust restriction/Maximum EGR flow while operating in EGR Mode

All information subject to change without notice. (Rev. April 2004) 2-7