Check Vpod Output Pressure - Detroit Diesel 60 EGR Series Technician Manual

DDEC IV TESTING

Check VPOD Output Pressure

Follow these steps to check both VPOD (EGR valve and VNT) output pressure:
NOTE:
Listen for air leaks at the VPOD during the test.
To avoid injury from the sudden release of a high-pressure
hose connection, wear a face shield or goggles.
1. Disconnect the air hoses from the EGR and VNT (Variable Nozzle Turbine) actuators.
2. Install pressure gauges (accurate to within 1.4 kPa [0.2 psi]) at the outlet of the EGR and
VNT hoses. (Use two gauges, or test separately.)
3. Using the DDR/DDDL, activate PWM #2 (EGR) and PWM #4 (VNT) duty cycles and
monitor the output pressure from the VPOD.
4. Test: activating 11 % duty cycle: Pressure = 106 – 134 kPa (15.4 – 19.4 psi). Go to
steps 5[a] and 5[b].
5. Test: activating 90 % duty cycle: Pressure = 485 — 515 kPa (70 – 75 psi).
[a] If the VPOD readings are as listed, Check for Active Codes.
5-10
PERSONAL INJURY
7SE60 0404 Copyright © 2004 DETROIT DIESEL CORPORATION
All information subject to change without notice. (Rev. April 2004)