SERIES 60 EGR TECHNICIAN'S GUIDE
Failure Mode
:
SID147, FMI 12 — VNT Vanes Not Responding (Boost Jake)
Indicates
:
Low boost or high boost while braking.
SID147, FMI 12 will be set by the ECM if, the signal from the manifold pressure sensor indicates
“Actual Boost” is above “Desired Boost” OR “Actual Boost” is below “Minimum Boost” when
the ECM is in “Jake Mode” 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
Turbocharger failure (e.g. damaged or defective compressor/turbine wheel)
Restricted air inlet (including filter)
Exhaust manifold leakage
EGR valve leakage
Delivery pipe leakage
Low vehicle air pressure supply
Defective or leaking VPOD
Leaking air system
Charge air cooler
Hoses
Loose hose clamps
All information subject to change without notice.
(Rev. April 2004)
4-11
7SE60 0404
Copyright © 2004 DETROIT DIESEL CORPORATION