Doosan D50S-5 Operation & Maintenance Manual page 110

perform a safety test of the perform a safety test of the
throttle return spring throttle return spring
following engine shutdown. If following engine shutdown. If
481 481 this spring has become weak this spring has become weak
(28) (28)
the throttle will fail the test the throttle will fail the test
and set the fault. and set the fault.
NOTE: NOTE: The throttle
assembly is not a assembly is not a
serviceable item and can serviceable item and can
only be repaired by only be repaired by
replacing the DV-EV replacing the DV-EV
throttle assembly . . throttle assembly
HbridgeFault_ETC HbridgeFault_ETC
Electronic Throttle Control Electronic Throttle Control
Driver has failed. Driver has failed.
Indeterminate fault on Indeterminate fault on
491 491
(29) (29) Hbridge driver for electronic Hbridge driver for electronic
throttle control. Possibly throttle control. Possibly
either ETC+ or ETC- driver either ETC+ or ETC- driver
signals have been shorted to signals have been shorted to
ground ground
521 521 LowOilPressureFault LowOilPressureFault
(52) (52)
Low engine oil pressure Low engine oil pressure
SysVoltRangeLow SysVoltRangeLow
531 531
(53) (53)
System voltage too low System voltage too low
(*) Fault actions shown are default values specified by (*) Fault actions shown are default values specified by the OEM.
Operation Section Operation Section
Table 2. Table 2. MI-07 Diagnostic Fault Codes (Flash Codes) cont'd. MI-07 Diagnostic Fault Codes (Flash Codes) cont'd.
DFC DFC
The throttle
PROBABLE FAULT PROBABLE FAULT
(1) TurnOnMil (1) TurnOnMil
(2) EngineShutdown (2) EngineShutdown
TurnOnMil TurnOnMil
(1) TurnOnMil (1) TurnOnMil
(2) DelayedEngine (2) DelayedEngine
Shutdown Shutdown
(3) CheckEngine Light (3) CheckEngine Light
TurnOnMil TurnOnMil
the OEM.
109 109
FAULT FAULT ACTION ACTION * *
Check battery and charging system Check battery and charging system
voltage voltage
Check battery voltage during starting Check battery voltage during starting
and with the engine running and with the engine running
Check voltage regulator, alternator, Check voltage regulator, alternator,
Perform throttle spring test by cycling Perform throttle spring test by cycling
the ignition key and re-check for fault the ignition key and re-check for fault
Check ETC driver wiring for a shorted Check ETC driver wiring for a shorted
circuit circuit
SECM Pin A17 to ETC + Pin 1 SECM Pin A17 to ETC + Pi
SECM Pin A18 to ETC - Pin 4 SECM Pin A18 to ETC - Pin 4
Perform the throttle test using the Perform the throttle test using the
Service Tool and re-check for fault Service Tool and re-check for fault
Check the ETC internal motor drive by Check the ETC internal motor drive by
disconnecting the throttle connector disconnecting the throttle connector
and measuring the motor drive and measuring the motor drive
resistance at the throttle resistance at the throttle
TPS Pin 1 (+DRIVER) to TPS Pin 1 (+DRIVER) to
Pin 4 (-DRIVER) ~3.0-4.0 Pin 4 (-DRIVER) ~3.0-4.0
Ω Ω
Check engine oil level Check engine oil level
Check electrical connection to the oil Check electrical connection to the oil
pressure switch pressure switch
SECM Pin B9 to Oil Press SECM Pin B9 to Oil Pressure Switch
Check battery voltage Check battery voltage
Perform maintenance check on Perform maintenance check on
electrical connections to the battery electrical connections to the battery
and chassis ground and chassis ground
Check battery voltage during starting Check battery voltage during starting
and with the engine running to verify and with the engine running to verify
charging system and alternator charging system and alternator
function function
Measure battery power at SECM with a Measure battery power at SECM with a
multimeter (with key on) multimeter (with key on)
SECM Pin A23 (DRVP) to SECM Pin A23 (DRVP) to
SECM Pin A16 (DRVG) SECM Pin A16 (DRVG)
SECM Pin A23 (DRVP) to SECM Pin A23 (DRVP) to
SECM Pin B17 (DRVG) SECM Pin B17 (DRVG)
CORRECTIVE ACTION CORRECTIVE ACTION
FIRST CHECK FIRST CHECK
n 1
ure Switch