Doosan D50S-5 Operation & Maintenance Manual page 114

crank disable relay crank disable relay
LSDFault_LockOff LSDFault_LockOff
Fuel lock off Valve Fault, Fuel lock off Valve Fault,
717 717
signal has opened or shorted signal has opened or shorted
to ground or power or to ground or power or
defective Fuel lock off valve defective Fuel lock off valve
LSDFault_MIL LSDFault_MIL
Malfunction Indicator Lamp Malfunction Indicator Lamp
718 718 Fault, signal has opened or Fault, signal has opened or
shorted to ground or power shorted to ground or power
or defective MIL lamp or defective MIL lamp
GasFuelAdaptRangeLo GasFuelAdaptRangeLo
721 721 In LPG mode, system had to In LPG mode, system had to
(72) (72)
adapt rich more than adapt rich more than
expected expected
GasFuelAdaptRangeHi GasFuelAdaptRangeHi
731 731 In LPG mode, system had to In LPG mode, system had to
(73) (73)
adapt lean more than adapt lean more than
expected expected
GasO2NotActive GasO2NotActive
Pre-catalyst O2 sensor Pre-catalyst O2 sensor
741 741
(74) (74) inactive on LPG, open O2 inactive on LPG, open O2
sensor signal or heater sensor signal or heater
leads, defective O2 sensor leads, defective O2 sensor
(*) Fault actions shown are default values specified by the OEM. (*) Fault actions shown are default values specified by
Operation Section Operation Section
Table 2. MI-07 Diagnostic Fault Codes (Flash Codes) cont'd. Table 2. MI-07 Diagnostic Fault Codes (Flash Codes) cont'd.
DFC DFC PROBABLE FAULT PROBABLE FAULT
TurnOnMil TurnOnMil
None None
TurnOnMil TurnOnMil
TurnOnMil TurnOnMil
(1) TurnOnMil (1) TurnOnMil
(2) DisableGas O2Ctrl (2) DisableGas O2Ctrl
the OEM.
113 113
FAULT FAULT ACTION ACTION * *
Check fuel lock off valve for an open Check fuel lock off valve for an open
wire or connector being disconnected wire or connector being disconnected
or signal shorted to GND or signal shorted to GND
Lockoff Pin B (signal) to SECM Pin A11 Lockoff Pin B (signal) to SECM
Lockoff Pin A (power) to SECM (DRVP) Lockoff Pin A (power) to SECM (DRVP)
Pin A23 Pin A23
Check CSV for an open coil by Check CSV for an open coil by
disconnecting the CSV connector and disconnecting the CSV connector and
measuring the resistance (~26 measuring the resistance (~26
Check MIL lamp for an open wire or Check MIL lamp for an open wire or
short to GND. short to GND.
Check for vacuum leaks. Check for vacuum leaks.
Check fuel trim valves, e.g. leaking Check fuel trim valves, e.g. leaking
valve or hose valve or hose
Check for missing orifice(s). Check for missing orifi ce(s).
Check fuel trim valves, e.g. plu Check fuel trim valves, e.g. plugged
valve or hose. valve or hose.
Check for plugged orifice(s). Check for plugged orifice(s).
Check that Pre-catalyst O2 sensor Check that Pre-catalyst O2 sensor
connections are OK. connections are OK.
O2 (signal) Pin 3 to SECM Pin B13 O2 (signal) Pin 3 to SECM Pin B13
O2 Pin 2 (HEATER GND) to SECM O2 Pin 2 (HEATER GND) to SECM
(DRVG GNG) Pins A16, B17 (DRVG GNG) Pins A16, B17
O2 Pin 1 (HEATER PWR) to SECM O2 Pin 1 (HEATER PWR) to SECM
(DRVP + 12V) Pin A23 (DRVP + 12V) Pin A23
Verify O2 sensor heater circuit is Verify O2 sensor heater circuit is
operating by measuring heater operating by measuring heater
resistance resistance
(2.1 (2.1 ± 0.4 ± 0.4 ) )
Ω Ω Ω Ω
O2 Pin 2 (HEATER GND) to Pin 1 O2 Pin 2 (HEATER GND) to Pin 1
(HEATER PWR) (HEATER PWR)
CORRECTIVE ACTION CORRECTIVE ACTION
FIRST CHECK FIRST CHECK
Check that Post-catalyst O2 sensor Check that Post-catalyst O2 sensor
connections are OK. connections are OK.
O2 (signal) Pin 3 to SECM Pin B19 O2 (signal) Pin 3 to SECM Pin B19
O2 Pin 2 (HEATER GND) to SECM O2 Pin 2 (HEATER GND) to SECM
(DRVG GNG) Pins A16, B17 (DRVG GNG) Pins A16, B17
Pin A11
± 3 ± 3 ) )
Ω Ω Ω Ω
gged