Doosan DX60R Shop Manual page 452

Starting failure
Symptoms and conditions of failure
Starter does
not rotates
Possible causes
Fuse blown or broken O
Starter faulty
Alternator faulty
Wires disconnected O
Wires short-circuited (sheathing broken);
•
overloaded by the power consumption by
additional devices
Battery voltage low
Key switch faulty or disconnected O
Key switch instantly cut off
Starter relay faulty, disconnected, or short-
circuited
Main relay faulty
(except for sticking of the contact, which is O
undetectable by ECU)
Actuator relay faulty
(contact failure undetectable by ECU)
Start assist relay faulty
(contact failure undetectable by ECU)
Accelerator sensor signal error
(an error undetectable by ECU)
Water temperature sensor signal error
(an error undetectable by ECU)
Speed sensor signal error (an error undetectable
by ECU, such as caused by noise)
Rack position sensor signal error
(an error undetectable by ECU)
Rack actuator malfunctioning
(an error undetectable by ECU)
ECU failure lamp disconnected
ECU faulty (ECU self diagnosis failure) O
Engine
Engine stall
Speed control error
after start up
Starter Work
Smoke No load
rotates load
O O
O O
O
O O O
O O
O
O O
O
? ? O
O O
O O O
• •
O O
•
O O O O
• •
O O O
• •
O O O
O O
Engine Noise and Cooling Intake
Lubricating oil
output low vibration water air
Smoke
color
•
O
•
O
O
O
Exhaust gas Fuel Electrical parts
Work
load
Corrective Action
• •
Replace the fuse.
Repair or replace the starter.
Repair
O
alternator.
Repair
O O O O disconnected wire(s) of the
harness.
Inspect, repair, or replace the
•
harnesses and wires as needed.
Reexamine
devices.
- Inspect and charge the battery.
Repair or replace the harness.
O
Replace the key switch.
Replace the key switch.
Repair or replace the harness.
Replace the starter relay.
Repair or replace the harness.
O
Replace the main relay.
Replace the actuator relay.
Δ
Replace the start assist relay.
Repair
accelerator sensor.
Replace the water temperature
sensor.
Repair or replace the fuel
injection pump.
Repair or replace the fuel
injection pump.
Repair or replace the fuel
injection pump.
O Replace the lamp.
O O Replace the ECU.
Referenced page number
or replace the
or replace the
the additional
or replace the
Monitor the engine speed using
the diagnosis tool.
Monitor the rack position sensor
signal using the diagnosis tool.
Monitor the rack actuator using
the diagnosis tool.
SP001434
Page 272