Page 637 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-491

YES>To step 4.

No >Clean and change the default parts.

4 . Check EGR system
(a) Check whether EGR system has leakage.

Is the inspection result normal? 04
YES>To step 5.
No >Maintenance related faults.

5 . Check fuel system
(a) Check the quality of engine oil is accord with standard.

Is the inspection result normal?
YES>To step 6.
NO> Replace fuel.

6 . 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.

Is the inspection result normal?
YES>To step 7.
No > Clean the injector. Check the working conditions of the injector again. If the
injection is still abnormal, replace the injector.

7 . Check the exhaust system
(a) Check the exhaust system.

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