Doosan D20S-5 Operation & Maintenance Manual page 110

Operation Section Operation Section
Table 2. Diagnostic Fault Codes (Flash Codes) cont'd. Table 2. Diagnostic Fault Codes (Flash Codes) cont'd.
DFC DFC
EST7_Short EST7_Short
EST7 output shorted high or EST7 output shorted high or
low, EST7 signal shorted to low, EST7 signal shorted to
437 437
ground or power or de ground or power or defectiv
spark module spark module
EST8_Short EST8_Short
EST8 output shorted high or EST8 output shorted high or
438 438 low, EST8 signal shorted to low, EST8 signal shorted to
ground or power or de ground or power or defectiv
spark module spark module
ETC_Sticking ETC_Sticking
Electronic Throttle Control is Electronic Throttle Control is
sticking. This can occur if the sticking. This can occur if the
throttle plate (butterfly valve) throttle plate (butterfly valve)
inside the throttle bore is inside the throttle bore is
sticking. The plate sticking can sticking. The plate sticking can
be due to some type of be due to some type of
461 461
obstruction, a loose throttle obstruction, a loose throttle
(26) (26)
plate, or worn components shaft plate, or worn
bearings. bearings.
NOTE: NOTE:
is is not not a s
can only be repaired by can only be repaired by
repl replacing
a a s s s s em
ETC_Open_Fault ETC_Open_Fault
Electronic Throttle Control Driver Electronic Throttle Control Driver
has failed, normally set if driver has failed, normally set if driver
471 471
signals have failed open or signals have failed open or
become disconnected, become disconnected,
electronic throttle or SECM is electronic throttle or SECM is
defective. defective.
ETCSpringTest ETCSpringTest
Electronic Throttle Control Electronic Throttle Control
Spring Return Test has failed. Spring Return Test has failed.
The SECM will perform a safety The SECM will perform a safety
test of the throttle return spring test of the throttle return spring
following engine shutdown. If the following engine shutdown. If the
drive mechanism is damaged, or drive mechanism is damaged, or
481 481
the return spring has lost tension the return spring has lost tension
(28) (28)
the throttle will fail the test and the throttle will fail the te
set the fault. set the fault.
NOTE: NOTE:
is is not a not a s s ervi
can only be repaired by can only be repaired by
replaci ci ng the repla
a a s s s s em
(*) Fault actions shown are default values specified by the OEM. (*) Fault actions shown are default values specified by the OEM.
PROBABLE PROBABLE FAULT FAULT
fective e
fective e
components shaft
The throttle as The throttl e as s s emb embly ly
a s ervi erviceab ceable item le item an and d
acing th the DV e DV -E -E V V throt throttl tle e
embl bly. y.
st and
The throttl The throttle as e as s s emb embly ly
erviceab ceable item le item an and d
ng the DV DV -E -E V thrott V throttle le
embl bly. y.
-107- -107-
FAULT ACTION FAULT ACTION * * CORRECTIVE CORRECTIVE ACTION
None None
None None
Check for debris or Check for debris or obstructions inside
the throttle body the throttle body
Perform the throttle test using the Perform the throttle test using the
Service Tool and re-check for fault t Service Tool and re-check for faul
• •
• •
(1) TurnOnMil (1) TurnOnMil
(2) EngineShutdown (2) EngineShutdown
SECM Pin A17 to ETC + Pin 1 SECM Pin A17 to ETC + Pin 1
(3) CutThrottle (3) CutThrottle
SECM Pin A18 to ETC - Pin 4 SECM Pin A18 to ETC - Pin 4
Check the ETC internal motor drive by Check the ETC internal motor drive by
disconnecting the disconnect
measuring the motor drive resistance at measuring the motor drive resistance at
the throttle the throttle
TPS Pin 1 (+DRIVE TPS Pin 1 (
Pin 4 ( Pin 4 (-DRIVER) ~3.0-4.0
Check the ETC driver wiring for an open Check the ETC driver wiring for an open
circuit circuit
SECM Pin A17 to ETC + Pin 1 SECM Pin A17 to ETC + Pin 1
SECM Pin A18 to ETC - Pin 4 SECM Pin A18 to ETC - Pin 4
(1) TurnOnMil (1) TurnOnMil
Check the ETC internal motor drive by Check the ETC internal motor drive by
(2) CutThrottle (2) CutThrottle
disconnecting the disconnectin
measuring the motor drive resistance at measuring the motor drive resistance at
the throttle the throttle
TPS Pin 1 (+DRIVE TPS Pin 1 (
Pin 4 (-DRIVER) ~3.0-4.0 Pin 4 (
(1) TurnOnMil (1) TurnOnMil
Perform throttle spring test by cycling Perform throttle spring test by
(2) EngineShutdown (2) EngineShutdown
the ignition key and re-check for fault the ignition key and re-check for fault
(3) CutThrottle (3) CutThrottle
ACTION FIRST FIRST CHECK
N/A N/A
N/A N/A
obstructions inside
Check throttle-plate shaft for bearing Check throttle-plate shaft for bearing
wear wear
Check the ETC driver wiring for an Check the ETC driver wiring for an
open circuit open circuit
ing the throttle connector and throttle connector and
+DRIVER) to R) to
-DRIVER) ~3.0-4.0
Ω Ω
g the throttle connector and throttle connector and
+DRIVER) to R) to
-DRIVER) ~3.0-4.0
Ω Ω
CHECK
cycling