Doosan D35S-5 Service Manual page 158

Unstable idle or engine stall.
Self diagnosis
Check fuel supply to injector
• Fuel in the tank
• Fuel pressure
Check air cleaner element
Check idle speed
Standard : 750rpm (A/C OFF)
850rpm (A/C ON)
Check injection timing
Check fuel pressure
Check injector
Check engine control system
D439E Service Manual
OK
OK
OK
OK
OK
OK
OK
Trouble code
• Use Hi-scan
NG
• Fuel line (Leakage, deformation)
• Fuse
• Supply pump
• Fuel filter
NG
• Fuel pressure
Clean or replace element
NG
Check ECU
NG
Check fuel system
NG
• Supply pump
• Fuel filter
NG • Fuel pressure regulator
Injection state
NG
• Wiring connection
• Power to ECU
1. Fusible link
2. Fuse
3. Control relay
• Engine coolant temperature
NG
sensor
• Injection signal circuit
1. Injector wiring
2. ECU
156 4. Fuel system