Page 542 - Foton Workshop Manual - Tunland (AT)

04-396 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 8.
No > Clean the injector. Check the working conditions of the injector again. If the
injection is still abnormal, replace the injector.

8 . 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 9.
No> Clean, repair or change the default parts.

9 . Check the cylinder pressure

(a) Perform the test of cylinder compression pressure.
Is the inspection result normal?

YES>To step 11.
NO >To step 10.

10 . Check the engine valve timing

(a) Check whether the engine timing gear mark is aligned, damaged or not, the belt is
loose, detaching or not.

Is the inspection result normal?
YES>To step 11.

No > Perform the alignment operation of the timing chin or change the timing chain.

11 . Check the motor machinery
(a) Use an endoscope to observe the in-cylinder condition.
(b) Observe and reflect the voltage changes.
(c) Disassemble and repair the motor internal fault.

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