Geely Diagnosis Flow. Manual part — 12

45

No. 027 Engine fails to start

Malfunction Cause

Solution

No fuel

Check fuel gauge and fuel level

Check battery voltage, whether it is normal, which shall above 11.5V. Charge or
replace battery when the value is too low. Check or replace circuit, if battery fails to
be charged as normal (check whether there is short circuit in inner/outer circuit,
which results current leaking). Check battery circuit and all connections, whether
they are well conducted.

Low battery voltage

Check starter, whether it operates normally. Maintain or replace it when necessary.

Starter malfunction

Check starter, whether it operates normally. Check starter circuit, solenoid switch,
carbon brush, coil and rotor, whether there is short or open circuit, as well as poor
conduction. Check one-way clutch whether it is slipping, as well as one-way clutch
and fly wheel tooth, whether they are damaged. Maintain or replace them when
necessary.

Ignition switch open
circuit and wire
malfunction

Check circuit, fuse, ignition switch by multimeter, set to resistance range, whether
they are open circuit. To inspection the malfunction.

Electric control system
malfunction

Connect Geely special No. to check whether there is malfunction No.. And inspect
again if it shows malfunction No.. Then check relevant component and circuit
according to the indication of malfunction No..

Check high voltage spark, if it operates normally, then check engine speed sensor,
ignition coil, ECU and relating circuit. Maintain or replace them when necessary.
(Connect two pins of primary winding respectively to multimeter, and the
resistance shall be 0.4~0.6Ω at 20 . In same condition, the resistance of

℃

secondary winding shall be 11~15kΩ. Connect pin 2 and pin 3 of sensor to
multimeter pen respectively, and at 20 the rated resistance shall be 860Ω±10%)

℃

Check ignition timing, if it is improper, then check flywheel signal plate, whether it is
loose and malposition. Maintain or replace it when necessary.

Improper ignition
timing or weak spark
voltage

Check high voltage spark energy, if it is weak, then check ignition coil, high voltage
resistance. Replace it when necessary.

Spark plug malfunction

Check spark plug electrode clearance and carbon deposit condition. Adjust or
replace it when abnormal.

Check timing belt, whether there is damage. Replace it when necessary.

Incorrect valve timing

Check timing belt, whether there is damage. Replace it when necessary.

Air filter blocked or
intake system leaking

Check air filter, whether it is blocked. Clean or replace it when necessary. Check
intake system, particularly intake manifold, injector, vacuum pipe and connector,
whether they are leaking. Exclude the malfunction when necessary.

Fuel system
malfunction

Fuel pressure shall above 260kPa when idling. Otherwise, the fuel pressure is low,
and shall check fuel pump, fuel pressure controller and fuel pipe, whether there is
malfunction.

Engine signal plate
loose or moved

Check engine signal plate, whether is it loose or moved. When necessary, shall
position it (20 teeth after point T for 4-cylinder, 16 teeth after point T for 3-cylinder)
first, then weld or replace engine signal plate.

Exhaust system
blocked

Check or replace exhaust system blocking position

Low cylinder pressure

Measure cylinder pressure. Fill a few oil into cylinder to determine whether the
cylinder or piston ring worn out, as well as valve sealing leaking. Adjust valve
clearance or disassemble engine when cylinder pressure is too low.

Injector malfunction

Check both ends of connector of each injector by oscillograph or multimeter,
whether there is pulse signal. If not, shall check parts of controlling circuit or ECU.
Otherwise, remove injector and check fuel injection quantity and atomization,
whether it is normal. Clean or replace it when necessary.

Engine fails to
start

ECU malfunction

ECU controller fails to input or output signal normally, replace it.

46

Engine fails to start

No fuel

Low battery voltage

Starter failure

Ignition switch open circuit and wire failure

Electric control system failure

Improper ignition timing or weak spark voltage

Spark plug failure

Incorrect valve timing

Air filter blocked

Fuel system failure

Low cylinder pressure

Exhaust system blocked

Injector failure

Engine signal plate loose or moved

ECU inner short circuit

Replace

Replace

Unplug

Clean and replace

Check

Charge

Fill

Check and replace

Check and replace

Check and replace

Check

Clean

Maintain

Maintain

Check or replace

Error

Abnormal

Blocked

Low pressure

N

Lack

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Y

Normal

47

No. 028 Hard to start in cold condition

Malfunction Cause

Solution

Check battery voltage whether it is normal. Charge or replace it when
necessary.

Check starter, whether it operates normally. Maintain or replace it when
necessary.

Low engine speed when
driven by starter

Check oil condition, whether it is too thick. Replace standard grade oil when the
oil is too thick, which results large inner engine friction and further causes low
engine speed.

Electric controlling
system malfunction

Connect Geely special decoder to check whether there is malfunction code..
And inspect again if it shows malfunction code. Then check relevant component
and circuit according to the indication of malfunction code.

Cooling fluid temperature
sensor malfunction

Water temperature sensor fails to output signal or outputs incorrectly, which will
affect fuel injecting adjustment of engine ECU and results improper mixture gas
viscosity. And further causes engine fails to start, operates unstably, stop
operating or running intermittently. Check cooling fluid temperature sensor. In
different temperatures, its resistance shall vary according to specified standard.
Replace it when necessary.

Spark plug operates
abnormally

The spark plug clearance shall between 0.8mm and 1.2mm. If there is lots of
fuel on spark plug surface, it indicates fuel fouling in cylinder. In this case, shall
remove all spark plugs, disconnect injector circuit, full open the throttle, and
start engine for several times to exclude the malfunction.

Low fuel pressure

Check fuel pressure, if it is too low, shall check fuel pressure controller, electric
fuel pump and fuel filter etc.

Incorrect oil grade, too
thick

Since oil grade is improper, which results large oil viscosity and hardly start, the
oil shall be replaced according to local temperature.

Check valve timing, whether it is correct. Adjust it when necessary.

Check igniting operation, whether there is high voltage spark. If not, shall check
engine speed sensor, ignition coil and related ECU circuit. Maintain or replace
them when necessary.

Improper ignition timing or
weak spark energy

Check high voltage spark energy, if it is weak, then check ignition coil, high
voltage resistance. Replace it when necessary.

Exhaust system blocked

Unplug blocked exhaust system

Over carbon deposit in
intake manifold or valve

Over carbon deposit in intake manifold and valve, will cause low viscosity of
mixture gas in cold condition, and results hard to start. Shall clean the carbon
deposit.

If the filter element is too dirty and blocked, the engine will be hard to start.
Remove the filter element and start engine, if it operates normally, then replace
the element.

Air filter blocked or intake
system leaking

Check intake system, whether it is leaking. Particularly the intake mainfold
gasket, vacuum pipe and connector etc. Exclude the malfunction.

Injector blocked or fuel
atomized abnormally

Remove injector, check fuel injection quantity and fuel atomization, whether
they are normal. Clean or replace it when necessary.

Low cylinder pressure

Measure engine cylinder compressing pressure, if it is low, but will increase
after filled a few oil into the cylinder, then the cylinder or piston ring is worn out
and need to replace or implement cylinder boring repair. If the pressure remains
at low value, then it indicates improper valve clearance, valve burnt or leaking.
Shall adjust valve clearance or replace valve.

Hard to start in
cold condition

ECU malfunction

ECU controller fails to input or output signal normally, replace it.

48

Hard to start in cold condition

Low engine speed when driven by starter

Electric controlling system short or open circuit

Cooling fluid temperature sensor failure

Spark plug operates abnormally

Low fuel pressure

Improper ignition timing or weak spark energy

Injector blocked or fuel atomized abnormally

Air filter blocked

Over carbon deposit in intake mainfold or valve; exhaust

pipe blocked

Low cylinder pressure

ECU malfunction

Replace

Replace

Clean and replace

Check

Adjust and replace

Check

Clean

Maintain

Check

Check

Check

Poor

Low

Abnormal

Blocked

Over carbon deposit

Lack

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal