Doosan D35C-5 FDA04 Operation & Maintenance Manual page 122

Operation Section
Table 2. Diagnostic Fault Codes (Flash Codes) cont'd.
DFC PROBABLE FAULT
IATRangeHigh
Intake Air Temperature
Sensor Input is High normally
381
set if the IAT temperature
(38)
sensor wire has been
disconnected or the circuit has
opened to the SECM.
IAT_IR_Fault
391 Intake Air Temperature not
changing as expected
EST1_Open
EST1 output open, possibly
421
open EST1 signal or defective
spark module
EST2_Open
EST2 output open, possibly
422
open EST2 signal or defective
spark module
EST3_Open
EST3 output open, possibly
423
open EST3 signal or defective
spark module
(*) Fault actions shown are default values specified by the OEM.
FAULT ACTION *
Check TMAP connector and IAT signal wiring
for a shorted circuit
TMAP Pin 2 to SECM Pin B12 (signal)
TMAP Pin 1 to SECM Pin B1 (sensor GND)
TurnOnMil To check the IAT sensor of the TMAP
disconnect the TMAP connector and measure
the IAT resistance
Resistance is approx 2400 ohms at room
temperature.
Check connections to TMAP sensor. Check
None that TMAP sensor is properly mounted to
manifold.
Check coil driver wiring and connector for open
circuit
SECM Pin A9 (EST1) to OEM ignition system.
See application note.
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.
Check coil driver wiring and connector for open
circuit
SECM Pin A10 (EST2) to OEM ignition
system. See application note.
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.
Check coil driver wiring and connector for open
circuit
SECM Pin A3 (EST3) to OEM ignition system.
See application note.
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.
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CORRECTIVE ACTION FIRST CHECK