Page 997 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-311

04
(d) When the diagnostic tool controls the throttle rotation, the motor speed can have high
or low changes simultaneously.
(e) Unplug the idling motor plug inspection, measuring connector terminal should be 12V
voltages.
(f) When turn off the ignition switch, depress and release the accelerator pedal to check
the throttle rotates or not.

Is the inspection result normal?
YES>To step 4.

No > Clean, fix or change the harness, connector or throttle valve.

4 . 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.

CAUTION
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 5.

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

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.