Page 996 - Workshop Manual - Tunland (2017)

04-310 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04 THE ENGINE WILL TURN OFF WHEN STARTS

Diagnosis logic Diagnosis logic Possible reasons
• Fuel system • Fuel system fault
• Electronic throttle • Electronic throttle fault
The engine will turn off when • Injector • Injector fault
starts • Intake system • Ignition system fault
• Poor load signal • Poor load signal
• ECM • ECM fault

CAUTION

If in the idle conditions, the moor starts jitter, declines in speed, easily flame out,
should find reasons from idle control system.

Diagnosis Procedure

1 . Check the engine data
(a) Ignition switch: OFF.
(b) Connect the diagnosis tool with the fault diagnosis connector (16 pins) on the lower
left of the dashboard.
(c) Ignition switch: ON, and start the diagnostic tool.
(d) Read the motor data shown on the diagnostic tool.

Check whether the data flow is normal or not.
YES>To step 2.
No >Maintenance related faults.

2 . Perform visual and external check
(a) Observe the rotation status and shaking degree of the engine
(b) At the same time, observe the swing range of the engine tachometer indicator, and
check whether it deviates from the idle target value.
(c) Observe whether it is normal idle jitter or load idle jitter. (Turn on the air conditioner,
light, hanging gear and turn the steering wheel etc.)
(d) Whether the external parts of the motor are normal or not; whether the wire connector
looses or not.

Is the inspection result normal?
YES>To step 3.
No > Exclude the abnormal problem and confirm that the phenomenon no longer
exists.

3 . Check the throttle body
(a) Check whether the throttle has oil and carbon deposition is stuck or not, the air intake
channel around the throttle has oil and carbon deposition or not.
(b) Start the motor, idling rotation.
(c) Use a diagnostic tool, perform the throttle test.