Common rail trouble shooting example 2015.7.16.ppt

Mitsubishi common rail

1. Example
1) The engine stalls after starting or when idling
2) Engine is Cranked at Normal Speed , but does not start
3) Idle Speed after starting the engine is abnormal
4) Engine performance is poor
Common rail troubleshooting

2. Supply Pump
Fuel Tank
Fuel Temperature
Engine Speed
Accelerator Opening
Turbo Pressure
Atmospheric Air Pressure
etc
Rail Pressure
sensor
Fuel Temperature sensor SCV
(Suction Control Valve)
Engine ECU
1) The engine stalls after starting or when idling
X
Check items
Supply pump

3. Fuel feed pump

4. Cam shaft

5. Supply Pump
Fuel Tank
Fuel Temperature
Engine Speed
Accelerator Opening
Turbo Pressure
Atmospheric Air Pressure
etc
Rail Pressure
sensor
Fuel Temperature sensor SCV
(Suction Control Valve)
Engine ECU
1) The engine stalls after starting or when idling
X
Check items
Electrical wire
SCV
Bad fuel
Leak test

6. Worn out
Fuel cut test
(Balance test)

7. Example
1) The engine stalls after starting or when idling
2) Engine is Cranked at Normal Speed , but does not start
3) Idle Speed after starting the engine is abnormal
4) Engine performance is poor
Common rail troubleshooting

8. Supply Pump
Fuel Tank
Fuel Temperature
Engine Speed
Accelerator Opening
Turbo Pressure
Atmospheric Air Pressure
etc
Rail Pressure
sensor
Fuel Temperature sensor SCV
(Suction Control Valve)
Engine ECU
2) Engine is Cranked at Normal Speed , but does not start
Check items
Electrical wire
SCV
Bad fuel
Leak test
X
X

9. Example
1) The engine stalls after starting or when idling
2) Engine is Cranked at Normal Speed , but does not start
3) Idle Speed after starting the engine is abnormal
4) Engine performance is poor
Common rail troubleshooting

10. Supply Pump
Fuel Tank
Fuel Temperature
Engine Speed
Accelerator Opening
Turbo Pressure
Atmospheric Air Pressure
etc
Rail Pressure
sensor
Fuel Temperature sensor SCV
(Suction Control Valve)
Engine ECU
3) Idle Speed after starting the engine is abnormal
Check items
Warning lamp
ID registration
X

11. Supply Pump
Fuel Tank
Fuel Temperature
Engine Speed
Accelerator Opening
Turbo Pressure
Atmospheric Air Pressure
etc
Rail Pressure
sensor
Fuel Temperature sensor SCV
(Suction Control Valve)
Engine ECU
3) Idle Speed after starting the engine is abnormal
Check items
Fuel filter
Rail pressure sensor
X
X
Filter

12. Supply Pump
Fuel Tank
Fuel Temperature
Engine Speed
Accelerator Opening
Turbo Pressure
Atmospheric Air Pressure
etc
Rail Pressure
sensor
Fuel Temperature sensor SCV
(Suction Control Valve)
Engine ECU
3) Idle Speed after starting the engine is abnormal
Check items
Supply pump
X

13. Example
1) The engine stalls after starting or when idling
2) Engine is Cranked at Normal Speed , but does not start
3) Idle Speed after starting the engine is abnormal
4) Engine performance is poor
Common rail troubleshooting

14. Supply Pump
Fuel Tank
Fuel Temperature
Engine Speed
Accelerator Opening
Turbo Pressure
Atmospheric Air Pressure
etc
Rail Pressure
sensor
Fuel Temperature sensor SCV
(Suction Control Valve)
Engine ECU
4) Engine performance is poor
Check items
Sensors
Rail pressure sensor
Injectors
Supply pump
X
X
X

15. Handle carefully
Supply Pump
Fuel Tank
High temperature
and pressure