Page 2674 - Foton Workshop Manual - Sauvana

62-622 DIAGNOSIS-ENGINE CONTROL SYSTEM

7. Check the fuel injector

(a). Unplug the injector connector.
(b). Unplug the fuel distribution pipes and injector 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, if the spray shows “column” instead of
tapered, or the fuel amount the four cylinder injectors spraying differs largely(more than 5
ml) 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.

Is the result normal?
Yes>To step 8.
No> Clean the injector. Check the working status of injector again. If it still injects wrongly,
change it.

8. Check the secondary ignition system

(a). Unplug the fuel injector fuse.
(b). Remove the high voltage wire and the spark plug.
(c). Connect the spark plug with the high voltage wire and connect the spark plug
negative to the cylinder block.
(d). Start the motor to test the secondary ignition system.

Is the result normal?
Yes>To step 10.
No> To step 9.

9. Check the spark plug

(a). Check the high-voltage coil resistance and clean the connector terminals.
(b). Check whether the spark plug has carbon deposition and carbon marks or not, the
ceramic insulation part is cracked and leaked or not, the gaps are normal or not.

Is the result normal?
Yes>To step 10.
No> Clean and change the default parts.

10. Check the cylinder pressure

(a). Perform the test of cylinder compression pressure.

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