Doosan D20S-5 Operation & Maintenance Manual page 125

Table 2. Diagnostic Fault Codes (Flash Codes) cont'd.
DFC PROBABLE FAULT
LiqPostO2FailedLean
Pre-catalyst O2 sensor
852
indicates extended lean
operation on gasoline
LiqO2FailedRich
Pre-catalyst O2 sensor
871
indicates extended rich
operation on gasoline
LiqPostO2FailedRich
Pre-catalyst O2 sensor
872
indicates extended rich
operation on gasoline
O2RangeLow
Pre-catalyst O2 sensor
911 voltage out of range low,
sensor signal shorted to
ground
O2_PostCatRangeLow
Post-catalyst O2 sensor
912 voltage out of range low,
sensor signal shorted to
ground
O2RangeHigh
Pre-catalyst O2 sensor
921 voltage out of range high,
sensor signal shorted to
power
O2_PostCatRangeHigh
Post-catalyst O2 sensor
922 voltage out of range low,
sensor signal shorted to
ground
FuelTempRangeLow
Fuel Temperature Sensor
Input is Low normally set if
931 the fuel temperature
sensor wire has shorted to
chassis ground or the
sensor has failed.
FuelTempRangeHigh
Fuel Temperature Sensor
Input is High normally set if
932 the fuel temperature
sensor wire has been
disconnected or the circuit
has opened to the SECM.
(*) Fault actions shown are default values specified by the OEM.
FAULT ACTION *
(1) TurnOnMil
(2) DisableLiqPost
O2Ctrl
(Certified Units Only)
(1) TurnOnMil
(2) DisableLiquid
O2Ctrl
(3)DisableLiquid
PostO2Ctrl
(1) TurnOnMil
(2) DisableLiq
PostO2Ctrl
(Certified Units Only)
None
None
(1) TurnOnMil
(2) DisableLiquid O2Ctrl
(3) DisableGas
O2Ctrl
(Certified Units Only)
(1) TurnOnMil
(2) Disable asoline
Post-catalyst
O2Ctrl
(3) Disable LPG
Post-catalyst
O2Ctrl
(Certified Units Only)
TurnOnMil
(Certified Units Only)
TurnOnMil
(Certified Units Only)
-123-
CORRECTIVE ACTION FIRST CHECK
Correct other faults that may contribute to 852
(e.g. faults pertaining to Injectors, MAP, IAT,
Pre-Cat O2, Post Cat O2 sensor)
Look for leaks in exhaust, catalytic converter,
HEGO sensors; repair leaks.
Check all sensor connections (see fault 842
corrective actions).
High gasoline fuel pressure, perform gasoline
pressure test
Injector problems, e.g. leaking, defective injector
Correct other faults that may contribute to 872
(e.g. faults pertaining to Injectors, MAP, IAT,
Pre-Cat O2, Post Cat O2 sensor)
Look for leaks in exhaust, catalytic converter,
HEGO sensors; repair leaks.
Check all sensor connections (see fault 842
corrective actions).
N/A
N/A
Check if O2 sensor installed before catalyst is
shorted to +5Vdc or battery.
O2 (signal) Pin 3 to SECM Pin B13
SECM (XDRP + 5V) Pin B24
SECM (DRVP + 12V) Pin A23
Check if O2 sensor installed after catalyst is
shorted to +5Vdc or battery.
O2 (signal) Pin 3 to SECM Pin B19
Possible voltage sources: SECM (XDRP + 5V)
Pin B24 and SECM (DRVP + 12V) Pin A23
Check fuel temp sensor connector and wiring for
a short to GND
SECM (signal) Pin B14 to FTS Pin 1
SECM (sensor GND) Pin B1 to FTS Pin 2
SECM (system GND) Pin A16, B17
Check if fuel temp
disconnected or for an open FTS circuit
SECM (signal) Pin B14 to FTS Pin 1
SECM (sensor GND) Pin B1 to
FTS Pin 2
Operation Section
sensor connector is