Page 588 - Foton Workshop Manual - Tunland (AT)

04-442 DIAGNOSTICS - ENGINE CONTROL SYSTEM

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

04 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 9.
No > Clean the injector. Check the working conditions of the injector again. If the
injection is still abnormal, replace the injector.

9 . Check coolant temperature sensor
(a) Check whether the coolant temperature sensor is installed correctly.
(b) Remove the coolant temperature sensor
(c) Check whether the sensing hole is blocked or not, and whether the resistance between
the terminals is in line with the standard or not.
(d) Check whether the coolant temperature sensor is dirty.
(e) Ignition switch: ON, and read the data flow of the coolant temperature sensor shown
on the diagnostic tool.

Is the inspection result normal?
YES>To step 10.
No >Maintenance related faults.

10 . Check EGR system
(a) Check whether the EGR valve can work properly.
(b) Check whether EGR system leaks.

Is the inspection result normal?
YES>To step 11.
No >Maintenance related faults.

11 . Check the exhaust system
(a) Check the exhaust system.
(b) Use the exhaust back pressure gauge to check whether the exhaust pipe is blocked.

Is the inspection result normal?
YES>To step 12.

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