Doosan D20S-7 - Page 93

Operation Section
-90-
Detect Control Failure
As shown in Table below, the ECU performs self diagnosis. If a fault/failure is detected, engine check lamp lights
up and failure code (DFC) is indicated by the number of flashes of the engine check lamp.
Enter the DFC Display Mode as follows:
- Repeat Releasing/Depressing of the acceleration pedal for three cycles within five seconds from Key On to
enter the Display Mode
- In the Display Mode, the Fault Code is displayed with the lamp repeatedly until Key OFF by the user
DFC Display Rule is as follows:
- All the Fault Codes are indicated with three digits
- The places of a Fault Code are separated by short pauses (0.5 sec), and in case of two or more Fault Codes,
the delay term before the next Fault Code display is a pause (1.2 sec).
- To notify the driver of the end of the Fault Display, a Long Pause (5 sec) followed by 12 (1 flash, short pause,
2 flash) is displayed.
DFC
Fault Item Symptoms at Fault
Corrective Action /
Conditions for Restoration
Classification
Engine
Check Lamp
Torque
Reduction
Others
351
Air Flow and
Temperature
Sensor
ON 50% Close the EGR valve
Key Off
Check sensors and harness
321 ON 50% X
323
Exhaust Gas
Temperature
ON 50% Close the EGR valve
Stop the vehicle and cool
down
231
EGR Valve
ON 50%
Close the EGR valve
Key Off
Check EGR valve and harness
232 ON 50%
322
Intake Air
Boost
Temperature
Sensor
ON X Close the EGR valve
Key Off
Check sensors and harness
343
Manifold
Pressure
Sensor
ON 50% Close the EGR valve
Key Off
Check sensors and harness
331
Coolant
Temperature
Sensor
ON 50% X
Key Off
Check sensors and harness
333
Fuel
Temperature
Sensor
ON 50% X
Key Off
Check sensors and harness
342
Oil
Temperature
& Pressure
Sensor
ON 50% X
Key Off
Check sensors and harness
411
Batteries
ON 50%
Close the EGR valve
Key off
Check battery condition
Check battery connection
412 ON X
312
Crank & Cam
Sensor
ON 80%
Idle rpm rises
Key off
Check the sensors and
harness
*Call Doosan A/S Team
311 X 80%