Geely Diagnosis Flow. Manual part — 9

33

No. 019 Engine vibration

Malfunction Cause

Solution

Engine bracket or vehicle body deformed

Replace engine bracket or correct vehicle body.

Low fuel pressure

Check supply pressure of fuel system, whether it is too
low, while the normal value is between 250kPa and
300kPa. Replace fuel pressure controller, fuel filter or
electric fuel pump and other relevant damaged
components.

Clutch system malfunction

Generally, the malfunction is caused by unbalance fly
wheel or press plate etc. Replace relevant components.

Engine operating with unavailable cylinder

Spark plug, cylinder cable, valve, valve clearance,
injector and cylinder sleeve worn out, and results
unavailable cylinder. Exclude the malfunction.

Check idle speed stepping motor, whether it is too much
carbon deposit. Clean or replace it when necessary.

Electric injection unit malfunction

Check throttle opening degree, clean or replace throttle
sensor when necessary.

Engine
operating
unstably,
starting
slowly, with
surge and
vibration

ECU damaged

Check ECU integrated circuit, whether it is damaged.
Replace it when necessary.

Engine vibration

Engine oprating with unavailable cylinder

Low fuel pressure

Engine bracket or vehicle body deformed

Clutch system malfunction

ECU damaged

Check

Check and replace

Replace

Check and replace

Check

Normal

Normal

Normal

Normal

Damage

Abnormal

Deform

Low

Check

34

No. 020 Exhaust pipe pours black smoke

Malfunction Cause

Solution

Air filter blocked

Check and clean/replace air filter

Low fuel quality

Apply unleaded clean fuel, 93# or above, which is in accordance
with manufacturer requirements.

Fuel contains in vacuum pipe

Check fuel pressure controller, whether it is damaged and leaking

High oil pressure

Check fuel pump, pumping pressure and controller function.

Improper ignition timing

Check and adjust ignition timing

Unavailable cylinder

Implement cylinder cross firing test respectively, check the
performance of wire and spark plug.

Valve leaking

Clean combustion chamber carbon deposit. Replace or grind
valve.

Injector leak or atomization abnormal

Clean or replace malfunction injector

Throttle position sensor malfunction

Measure the resistance and voltage of throttle, replace it when
necessary.

Oxygen sensor voltage abnormal

Measure sensor voltage and resistance, replace it when
necessary.

Cylinder gasket damage

Maintain or replace cylinder gasket.

ECU malfunction

Check ECU and circuit whether they are normal.

Light smoke
when idling,
heavier when
accelerating

Low cylinder pressure

Disassemble and maintain engine.

35

Exhaust pipe pours black smoke

Air filter blocked

Low fuel quality

High oil pressure

Unavailable cylinder

Improper ignition timing

Oxygen sensor voltage abnormal

Valve leaking

Cylinder gasket damage

ECU failure

Injector leak or atomization abnormal

Low cylinder pressure

Check

Clean or replace

Replace

Check and replace

Check

Check and replace

Check and replace

Replace

Replace

Clean or replace

Adjust

Abnormal

Low

Blocked

Abnormal

Abnormal

Abnormal

Leaking

Abnormal

Abnormal

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

36

No. 021 Engine idle speed decreases when activating head beam or fan

Malfunction Cause

Solution

Fuel quality is not in
accordance with requirement

Apply unleaded clean fuel, 93# or above.

Generator belt loose

Adjust belt tension to 50NM, when pressuring downwards, and the
deflection shall be 10MM.

Earth lead loose

Check gearbox, body earth lead and instrument earth lead, whether
they are loose. Tighten them when necessary.

Generator operates abnormal

Check the electrical energy of generator, whether it is beneath 9V.
Replace generator voltage controller when necessary.

Battery open circuit

Check the gravity of battery electrolyte, maintain or replace battery
assembly when necessary.

Idle speed controlling valve or
stepping motor malfunction

Clean idle speed control valve or stepping motor. Replace it when
damaged.

Grouped switch short circuit

Maintain grouped switch and relevant harness.

The power of head beam or the
load of fan is over normal value.

Check head beam, whether it applies the bulb requires the power over
standard value. Replace standard power bulb when necessary.
Replace fan motor or maintain the circuit.

Low generator charging current
(75A)

Replace generator assembly, which supplies 90A charging current.

Poor ECU signal

Measure the voltage among terminals and wire connecting condition.
Maintain or replace them when necessary.

Engine speed
decreases, with
vibration, when
activating head
beam or fan

Engine operates abnormal

Maintain engine