Geely Diagnosis Flow. Manual part — 15

57

Engine ECU failure

Oxygen sensor failure

Intake pressure sensor failure

Temperature sensor failure

Electric controlling system failure

Intake system leaking

Idle speed stepping motor failure

Throttle contains too much carbon deposit

Improper throttle cable or thorttle position sensor adjustment

Idle speed over normal value

Check

Clean and replace

Adjust

Replace

Clean

Check

Replace

Replace

Replace

Leak

Improper

Over normal value

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

58

No. 033 Engine accelerates abnormal

Malfunction Cause

Solution

Check air filter, whether it is blocked. Clean or replace when necessary.

Air filter blocked

Check intake system, whether it is leaking. Measure intake manifold vacuum, the
value shall above 30kPa when idling. Otherwise, the intake system is leaking. Shall
check connectors and all hoses and vacuum pipes carefully.

Press accelerate pedal fully, and check whether the throttle fully opens. Adjust
throttle cable or pedal, if it fails to open fully.

Improper adjustment
of throttle cable or
throttle position
sensor, which results
throttle fail to fully
open.

Check throttle position sensor. During throttle varies from full close to full open, the
resistance between signal terminal and earth terminal shall increase constantly,
without interruption. Adjust or replace the sensor according to regulation, when
abnormal.

Improper ignition
timing or weak spark
energy.

Check ignition timing. When idling, the ignition advance angle shall be 10º~12º.
Otherwise, shall adjust the primary ignition advance angle. When accelerating, the
angle shall increase to 20º~30º automatically. When abnormal, shall check ignition
controlling system, including ignition coil, spark wire and spark plug etc., alternative
replace ECU.

Low fuel pressure

Check fuel pressure. When idling, fuel pressure shall in accordance with regulation,
265~304kPa. When accelerating, fuel pressure shall increase about 50kPa. If fuel
pressure is too low, then shall check fuel pressure controller, electric fuel pump, fuel
filter and etc.

Injector blocked or
poor atomization

Remove injector and check injecting quantity and atomization quality, whether they
are normal. When abnormal, clean or replace the injector.

Low battery voltage

Check battery voltage, whether it is normal. If the value is too low, when will cause
fuel injecting quantity decrease, which results low engine power, as well as
accelerating delay. In this case, shall check charging system or replace battery.

Coolant temperature
sensor malfunction

Check coolant temperature sensor. In different temperatures, the resistance of the
sensor shall vary in accordance with regulated standard. Otherwise, shall replace
the sensor.

Intake pressure
sensor malfunction

Check intake manifold pressure temperature sensor. Replace it when abnormal.

Clutch sliding

Replace driven plate of clutch.

Low engine cylinder
pressure

Measure the compressing pressure of engine cylinder. If it is too low, then shall
adjust valve clearance, or disassemble and inspect engine.

Poor flywheel signal

In case of low power and accelerating performance, caused by poor flywheel and
signal wheel signal, shall replace flywheel assembly.

Crankshaft position
sensor malfunction

In case of ECU order delay and low accelerating performance, caused by the sensor
fails to indicate crankshaft position correctly, shall replace the sensor.

Incorrect engine valve
timing

Check engine valve timing, whether it is correct. Adjust it when incorrect.

Individual cylinder
fails to work

Check the operating condition of each cylinder, such as individual cylinder
operating, whether it is abnormal. Particularly the spark plug, spark wire and cylinder
pressure etc. Determine the malfunction cause and maintain or replace relating
parts.

Exhaust system
blocked

Check 3 way catalytic converter, whether it is blocked. The reverse interfere caused
by blockage will result poor engine accelerating performance. In this case, replace
3-way catalytic converter.

Engine
accelerates
abnormal

Oxygen sensor
malfunction

It results indiscernible mixture gas rate, as well as low power.

59

Oxygen sensor failure

Exhaust system blocked

Individual cylinder fails to work

Incorrect engine valve timing

Crankshaft position sensor failure

Poor flywheel signal

Low engine cylinder pressure

Clutch sliding

Intake pressure sensor failure

Cooling fluid temperature sensor failure

Low battery voltage

Injector blocked

Low fuel pressure

Improper ignition timing or weak spark energy

Air filter blocked

Engine accelerates abnormal

Improper adjustment of throttle cable or throttle position sensor

Check

Clean and replace

Adjust

Replace

Clean

Check

Normal

Replace

Charge

Replace

Check

Check

Check and adjust

Check

Replace

Check and replace

Blocked

Abnormal

Abnormal

Fails to work

Abnormal

Abnormal

Error

Poor

Low

Sliding

Low

Blocked

Low

Abnormal

Blocked

Improper adjusted

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

60

No. 034 Water temperature over normal value

Malfunction Cause

Solution

Lack of coolant

Check cooling system, whether there is enough
coolant. Add coolant if it is lack of coolant, which will
affect cooling performance.

Water temperature meter and sensor

malfunction

Water temperature over normal value, virtually.
Replace relating components.

Radiator leaking

Check radiator cap and radiator, maintain or replace
leaking part.

Thermostat fails to open as normal

Check upper and lower pipe temperature of radiator,
if there is high value difference, then shall remove
thermostat and measure the activating temperature.
Replace thermostat if it fails to open normally.

Water pipe leaking

Check water pipe, maintain leaking position and
fasten loose clip

Check water pump driving belt, whether it is loose or
damaged. Adjust or replace when necessary.

Water pump malfunction

Open radiator cap and start engine, to inspect
coolant flowing condition and determine whether the
water pump is working. If the coolant keeps still, then
remove and check water pump. Replace it when
blade wheel is damaged.

Heater radiator leaking

Check heater radiator, maintain or replace it.

Check radiator cooling fan motor and fan blade,
whether they are damaged. Maintain or replace them
when necessary.

Check coolant temperature sensor. In different
temperatures, the resistance of coolant temperature
sensor shall vary in accordance with regulated
standard. Otherwise, shall replace the sensor.

Radiator cooling fan fails to operate normally

Check engine ECU and radiator cooling fan motor
controlling circuit. Maintain or replace them when
necessary.

Cylinder head gasket damage

Check radiator, whether there are bubbles nearby.
Replace cylinder head gasket, may exclude the
malfunction.

Check radiator, whether it is blocked by mud or other
impurity. Clean or replace it, when cooling
performance is affected by blockage.

Poor radiator cooling performance

Check furring condition in radiator. Clean or replace
it, when cooling performance is affected.

Water temperature

over normal value,

when engine

operating

Part blockage in engine inner water cycling pipe Unplug or replace cylinder block