Page 569 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-423

Check whether it can start or not?

YES>Check the throttle valve, clean up the carbon deposition. Check whether the
throttle valve is stuck or not. If it is necessary, maintain or change it.
NO> To step 4.

4 . Check high pressure fuel pump actuator and its harness 04
(a) Check whether high pressure fuel pump actuator and its harness can work properly.

Is the inspection result normal?
YES>To step 5.

NO >Repair or replace fuel pump actuator wire harness.

5 . Check pressure of the fuel system
(a) Check pressure of the fuel system. ( Refer to " Chapter 13 Fuel system, Precaution")

Is the inspection result normal?
YES>To step 7.

NO >Repair or replace fuel system components. If the pressure is too low, go to step
6.

6 . Check the fuel supply of the fuel system
(a) Check whether it has leakage or block in the oil inlet or not.
(b) Check whether the fuel filter is blocked or not.

Is the inspection result normal?
YES>To step 7.

No >Clean and change the default parts.

7 . Check the fuel injector
(a) Unplug the injector connector.
(b) Remove the fuel distribution pipes and injector outside the engine together.
(c) Add the battery voltage of 12 V directly to the injector.
(d) Every injector shall inject the fuel according to the standard flow and have uniform
atomization.

NOTICE
When check the injection status of the injectors, the fuel amount the four cylinder
injectors spraying differs largely in the same conditions, then it should change the
injector. Check whether the injector nozzle has colloidal substances or not, if it has,
it may use cleaning agent to soak and spray, or it may cause the insufficient of fuel
or bad acceleration etc.

Page 569