Output Open, Possibly Open Est5 Signal Or Defective; Spark Module; Output Open, Possibly Open Est6 Signal Or Defective; For Open Circuit - Doosan G420F Service Manual

Table 2. Diagnostic Fault Codes (Flash Codes) cont'd.
DFC PROBABLE FAULT
IATRangeHigh
Intake
Sensor Input is High normally
381
set if the IAT temperature
(38)
sensor
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 open
421
EST1 signal or defective

spark module

EST2_Open EST2
output open, possibly open
422
EST2 signal or defective
spark module
EST3_Open EST3
output open, possibly open
423
EST3 signal or defective
spark module
(*) Fault actions shown are default values specified by the OEM.
G420F(FE) Service Manual
Air Temperature
wire has been
FAULT ACTION *
TurnOnMil
None
TurnOnMil
TurnOnMil
TurnOnMi
294
CORRECTIVE ACTION,
FIRST CHECK
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)
To check the IAT sensor of the TMAP
disconnect the TMAP connector and
measure the IAT resistance Resistance
is approx 2400
temperature.
Check connections to TMAP sensor.
Check 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 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 Pin
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 Pin A
(of both connectors)
Verify +12 Vdc on ignition module Pin
B (of both connectors)
Refer to application manual for specific
engine details.
Chapter 9. Advanced Diagnostics
ohms at room
A (of both