Doosan D20S-5 Operation & Maintenance Manual page 114

Operation Section
Table 2. Diagnostic Fault Codes (Flash Codes) cont'd.
DFC PROBABLE FAULT
EST4_Open
EST4 output open, possibly
424
open EST4 signal or defective
spark module
EST5_Open
425 EST5 output open, possibly
open EST5 signal or defective
spark module
EST6_Open
426 EST6 output open, possibly
open EST6 signal or defective
spark module
EST7_Open
EST7 output open, possibly
427
open EST7 signal or defective
spark module
EST8_Open
EST8 output open, possibly
428
open EST8 signal or defective
spark module
EST1_Short
EST1 output shorted high or
431 low, EST1 signal shorted to
ground or power or defective
spark module
(*) Fault actions shown are default values specified by the OEM.
FAULT ACTION *
Check coil driver wiring and connector for
open circuit
SECM Pin A6 (EST4) to OEM ignition
system. See application manual.
Verify GND on ignition module
TurnOnMil
Pin A (of both connectors)
Verify +12 Vdc on ignition module
Pin B (of both connectors)
Refer to application manual for specific
engine details.
None
None
None
None
None
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CORRECTIVE ACTION FIRST CHECK
N/A
N/A
N/A
N/A
N/A