Doosan D20S-5 Operation & Maintenance Manual page 116

Operation Section
Table 2. Diagnostic Fault Codes (Flash Codes) cont'd.
DFC PROBABLE FAULT
EST7_Short
EST7 output shorted high or
437 low, EST7 signal shorted to
ground or power or defective
spark module
EST8_Short
EST8 output shorted high or
438 low, EST8 signal shorted to
ground or power or defective
spark module
ETC_Sticking
Electronic Throttle Control is
sticking. This can occur if the
throttle plate (butterfly valve)
inside the throttle bore is
sticking. The plate sticking can
be due to some type of
461
obstruction, a loose throttle
(26)
plate, or worn components shaft
bearings.
NOTE: The throttle assembly
is not a serviceable item and
can only be repaired by
replacing the DV-EV throttle
assembly.
ETC_Open_Fault
Electronic Throttle Control Driver
has failed, normally set if driver
471 signals have failed open or
become disconnected,
electronic throttle or SECM is
defective.
ETCSpringTest
Electronic Throttle Control
Spring Return Test has failed.
The SECM will perform a safety
test of the throttle return spring
following engine shutdown. If the
drive mechanism is damaged, or
481
the return spring has lost tension
(28)
the throttle will fail the test and
set the fault.
NOTE: The throttle assembly
is not a serviceable item and
can only be repaired by
replacing the DV-EV throttle
assembly.
(*) Fault actions shown are default values specified by the OEM.
FAULT ACTION *
None
None
(1) TurnOnMil
(2) EngineShutdown
(3) CutThrottle
(1) TurnOnMil
(2) CutThrottle
(1) TurnOnMil
(2) EngineShutdown
(3) CutThrottle
-114-
CORRECTIVE ACTION FIRST CHECK
N/A
N/A
Check for debris or obstructions inside
the throttle body
Perform the throttle test using the
Service Tool and re-check for fault
Check throttle-plate shaft for bearing
•
wear
Check the ETC driver wiring for an
•
open circuit
SECM Pin A17 to ETC + Pin 1
SECM Pin A18 to ETC - Pin 4
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 the ETC driver wiring for an open
circuit
SECM Pin A17 to ETC + Pin 1
SECM Pin A18 to ETC - Pin 4
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
Perform throttle spring test by cycling
the ignition key and re-check for fault