Doosan D20S-5 Operation & Maintenance Manual page 117

Table 2. Diagnostic Fault Codes (Flash Codes) cont'd.
DFC PROBABLE FAULT
HbridgeFault_ETC
Electronic Throttle Control
Driver has failed.
Indeterminate fault on
491
Hbridge driver for
(29)
electronic throttle control.
Possibly either ETC+ or
ETC- driver signals have
been shorted to ground
521 LowOilPressureFault
(52) Low engine oil pressure
531 SysVoltRangeLow
(53) System voltage too low
541 SysVoltRangeHigh
(54) System voltage too high
(*) Fault actions shown are default values specified by the OEM.
FAULT ACTION *
(1) TurnOnMil
(2) CutThrottle
(1) TurnOnMil
(2) DelayedEngine
Shutdown
TurnOnMil
(1) TurnOnMil
(2) DelayedEngine
Shutdown
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CORRECTIVE ACTION FIRST CHECK
Check ETC driver wiring for a shorted circuit
SECM Pin A17 to ETC + Pin 1
SECM Pin A18 to ETC - Pin 4
Perform the throttle test using the Service
•
Tool and re-check for fault
Check the ETC internal motor drive by
disconnecting the throttle connector and
measuring the motor drive resistance at the
throttle
TPS Pin 1 (+DRIVER) to
Pin 4 (-DRIVER) ~3.0-4.0Ω
Check engine oil level
Check electrical connection to the oil
pressure switch
SECM Pin B9 to Oil Pressure Switch
Check battery voltage
Perform maintenance check on electrical
•
connections to the battery and chassis
ground
Check battery voltage during starting and
•
with the engine running to verify charging
system and alternator function
Measure battery power at SECM with a
•
multimeter (with key on)
SECM Pin A23 (DRVP) to
SECM Pin A16 (DRVG)
SECM Pin A23 (DRVP) to
SECM Pin B17 (DRVG)
Check battery and charging system voltage
Check battery voltage during starting and
•
with the engine running
Check voltage regulator, alternator, and
•
charging system
Check battery and wiring for overheating
•
and damage
Measure battery power at SECM with a
•
multimeter (with key on)
SECM Pin A23 (DRVP) to
SECM Pin A16 (DRVG)
SECM Pin A23 (DRVP) to
SECM Pin B17 (DRVG)
Operation Section