Doosan D50S-5 Operation & Maintenance Manual page 101

73 73 AFRTrimValveUpperDC AFRTrimValveUpperDC
FTV duty cycle at high (rich) limit FTV duty cycle at high (rich) limit
(Expected (Expected
connector is unplugged) connector is unplugged)
(G643E only) (G643E only)
Table a. MI-04 Diagnostic Fault Codes (Flash Codes) Table a. MI-04 Diagnostic Fault Codes (Flash Codes)
DFC DFC
74 74 O2SensorSwitching O2SensorSwitching
O2 sensor is not switching across O2 sensor is not switching across
the reference AFR voltage the reference AFR voltage
(G643E only) (G643E only)
fault fault when when FTV FTV
Probable Fault Probable Fault
Stored Fault Code Stored Fault Code
(MIL, Disable Adaptive (MIL, Disable Adaptive
learns) learns)
100 100
Action Action
Stored Fault Code Stored Fault Code
(MIL, Disable Adaptive (MIL, Disable Adaptive
learns) learns)
is frozen, this fault code can be set, is frozen, this fault code can be set,
too. It is not system trouble. too. It is not system trouble.
Check for intake manifold leaks Check for intake m anifold leaks
 
Check balance line (vacuum Check balance line (vacuum
 
hose) hose) connection connection
regulator regulator
Check N-CA55-500-TR mixer Check N-CA55-500-TR mixer
 
for heavy end build-up and for heavy end build-up and
operation (see mixer section) operation (see mixer section)
Check N2001 secondary for Check N2001 secondary for
 
operation operation or or low low
pressure pressure (see (see
Regulator section) Regulator section)
Engine measured Air/Fuel ratio at Engine measured Air/Fuel ratio at
the O2 sensor is excessively rich the O2 sensor is excessively rich
Check FTV connector wiring for an Check FTV connector wiring for an
open circuit open circuit
Check N-CA55-500-TR mixer Check N-CA55-500-TR mixer
 
for heavy end build-up and for heavy end build-up and
operation (see mixer section) operation (see mixer section)
Check N2001 secondary for Check N2001 secondary for
 
operation operation (see (see
Regulator section) Regulator section)
Operation Section Operation Section
Corrective Action, Corrective Action, First First Check
Note : If LP fuel in LP tank is not Note : If LP fuel in LP tank is not
enough, this fault code can be set. enough, this fault code can be set.
If LP tank is frozen, this fault code If LP tank is frozen, this fault code
can be set, too. It is not system can be set, too. It is not system
at at the the
primary primary
N2001 N2001
N2001 N2001
Check