SERIES 60 EGR TECHNICIAN'S GUIDE
Failure Mode
:
SID 147, FMI 7 — VNT Vanes Not Responding (EGR Mode)
Indicates
:
EGR flow requested by DDEC and excessive EGR flow detected.
SID 147, FMI 7 will be set by the ECM if, the signal from the Delta P sensor and EGR temperature
sensor indicate EGR flow is above a desired flow for a period greater than 50 seconds.
Response
: The CEL will be illuminated and the system will be forced into “Boost Mode” (EGR is
Disabled) for the remainder of the ignition cycle.
Possible Causes
:
VNT vanes/actuator — mechanical failure
High exhaust restriction
Defective Delta P sensor
EGR valve — mechanical failure
Failure Mode
:
SID 147, FMI 14 — EGR Flow Too Low
Indicates
:
EGR flow requested by DDEC and insufficient EGR flow detected.
SID 147, FMI 14 will be set by the ECM if, the signal from the Delta P sensor and EGR
temperature sensor indicate EGR flow is below a desired flow for a period greater than 50 seconds.
Response
: The CEL will illuminate and a fault message will be generated.
Possible Causes
:
VNT vanes/actuator — mechanical failure
EGR cooler restriction
Defective Delta P sensor
Plugged Delta P ports
EGR valve mechanical failure
EGR valve leaks
VPOD mechanical failure
Exhaust leaking at the S pipe
Leaking air lines from the VPOD to the actuators (insufficient air supply)
Leaking or low vehicle air supply to the VPODs
All information subject to change without notice.
(Rev. April 2004)
4-9
7SE60 0404
Copyright © 2004 DETROIT DIESEL CORPORATION