Page 580 - Foton Workshop Manual - Tunland (AT)

04-434 DIAGNOSTICS - ENGINE CONTROL SYSTEM

No >Maintenance related faults.

4 . Check high pressure fuel pump actuator circuit

(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Check whether high pressure fuel pump actuator circuit can work properly.
04
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.

DANGER
When testing the fuel system:

• Place a note with "Caution: Flammable" in the work area.
• Must work in a well ventilated area and with a carbon dioxide extinguisher.
• Smoking is strictly prohibited when working on the fuel system. Work areas
should be away from open flames and sparks.

• Put the fuel in an explosion proof container.

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