CODES
Logic codes identify a condition NOT a component.
Example: Code 39 DDEC uses the Differential Pressure sensor and EGR temperature sensor to
monitor EGR flow.
If
flow
is detected when there should be no flow, code 39 will activate.
If
NO FLOW
is detected when there should be flow, code 39 will activate.
Conditions that can cause Code 39 include but are not limited to:
Plugged EGR cooler
EGR valve defective (stuck open or closed)
VPOD defective
Differential pressure sensor plugged
The DTC will help guide the technician to the
condition
. The technician will require a knowledge
of the system and proper tools to diagnose the components.
4-2
All information subject to change without notice.
(Rev. April 2004)
7SE60 0404
Copyright © 2004 DETROIT DIESEL CORPORATION