Geely Diagnosis Flow. Manual part — 1

1

Engine

No. 001 Engine shuts off abnormally when driving

Malfunction Cause

Solution

Check the injection volume and the atomization of the injector, whether they are
normal, clean or replace the injector when necessary.

Low fuel pressure or

injector blockage

Check fuel pressure. When idling the value shall correspond to 265~304 kPa, when
accelerating the value shall increase approximately 50 kPa. If fuel pressure is too
low, check fuel pressure controller, electric fuel pump and fuel filter etc.

Improper ignition

timing, engine shuts

off sometimes

Check engine ignition timing. When idling, the ignition advance angle shall be
10~12°. Otherwise, shall adjust engine initial advance angle. When accelerating,
the ignition advance angle shall over 20~30°, automatically adjusted. Otherwise,
shall replace ECU or maintain ignition controlling system.

Check valve clearance, whether it is too small. When heating, the clearance of air
intake and exhaust valve shall be 0.20±0.05mm, otherwise, adjust it to prescribed
value according to maintenance manual.

Valve clearance too

small or throttle body

too dirty

Check throttle body, whether it is too dirty. Clean throttle body and idle speed
controller when necessary.

Fuel quality problem

When applying poor quality fuel, the fuel pipe must be cleaned then replace
standard gasoline, 93# or above.

Spark plug

malfunction

Check spark plug resistance, whether the value is 5~8KΩ, as well as the clearance,
whether the value is 0.8~1.0mm. Otherwise, shall adjust or replace them.

Ignition coil

malfunction

Check ignition coil, the initial winding shall be 0.4~0.6Ω, and the 2

nd

winding shall be

11~15Ω. Otherwise, shall replace ignition coil.

Spark plug wire

If there is short or open circuit in spark plug wire, then shall replace it.

Idle speed control

valve or stepper motor

malfunction

When stuck, shall clean or replace it.

Fuel pump relay burnt

Check the relay by multimeter, whether it is connected, as well as the coil
resistance, whether the value is 75~90Ω. Replace when necessary.

Valve gumming

Determine whether it is valve gumming, according to local and gasoline using
condition. Generally, the malfunction appears in cold condition, and will disappear
after vehicle heated. It is recommended that driver shall clean engine without
components removing, meanwhile, replace qualified gasoline.

ECU harness pin poor

contact

Check ECU, whether it is poor contact, which results signal deviation when idling,
as well as abnormal shut-off. Fasten wire connector again, when necessary.

Three way catalytic

converter damaged or

blocked

Check three way catalytic converter, whether it is free-flowing, as well as the
housing, whether there is collision mark. Replace the converter assembly when
necessary.

Pressure temperature

sensor malfunction

Temperature sensor part (pin disconnected) pin 1# and 2#: the rated resistance at
20 is 2.5KΩ±5%, and the value shall decrease when temperature raising.

℃

Pressure sensor part (pin connected): black pen connects to earth; red pen
connects with pin 3# and 4# respectively. In idle condition, the reference voltage on
pin 3# shall be 5V, and the voltage on pin 4# shall be approximately 1.3V
(determined by vehicle). If the value abnormal, then the pressure temperature
sensor is damaged and shall be replaced.

Poor ECU signal

Check main ECU wire harness connectors, whether they are fixed, as well as poor
connecting caused by rust and oxidation. Clean and fix it when necessary. Load
data stream by K61 detector, and check the display value of ECU, whether it
coordinates to the standard. Replace ECU when necessary.

Engine shuts

off in normal

driving, such

as geared

driving or
cornering

Insufficient engine

cylinder pressure

Check engine compression ratio and pressure, whether they are corresponding with
the standard value:
479Q 9.3: 1/1250kpa/250r/min; 479QA 9.8: 1/1440kpa/250r/min; 481Q9.4:
1/1360kpa/250r/min; JI376QE9.5: 1/1225kpa/350r/min; JL378QE 9.5: 1 /
1225kpa/350r/min; audit and maintain engine when necessary.

2

Engine shuts off abnormally when driving

Spark plug, ignition coil, spark plug wire

malfunction

Replace

Improper ignition timing

Valve clearance too small or throttle body too dirty

Fuel quality problem

Three way catalytic converter damaged or

blocked

Fuel pump relay burnt

Pressure temperature sensor failure

Poor ECU signal

Valve gumming

Idle speed control valve or stepper motor

malfunction

Low fuel pressure or injector blockage

Inssuficient engine cylinder pressure

Adjust

Adjust and clean

Replace

Replace

Replace

Replace

Replace

Mainatain

Clean or replace

Check or replace

Check engine

Abnormal

Abnormal

Abnormal

Abnormal

Burnt

Abnormal

Abnormal

Too low or bocked

Abnormal

Abnormal

Abnormal

Improper

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

3

No. 002 Engine surging

Malfunction Cause

Solution

Fuel fliter blockage

Check fuel filter, whether it is blocked, and replace it when necessary.

Charcoal canister

Check charcoal canister, whether it contains gasoline, replace it if gasoline
contains.

Fuel injector blockage or

poor atomized

Check the injection volume and atomization of injector, if they are abnormal,
then shall clean and replace injector assembly.

Low fuel pressure

Check fuel pressure, when idling, the pressure shall be in accordance with
regular value, 265~304kPa, and shall increase about 50kPa when
accelerating. If fuel pressure is too low, shall check fuel pressure controller,
electric fuel pump and etc.

Air intake system leakage

Test the actual pressure of manifold, whether it is in accordance with
standard.
Check intake manifold gasket whether it is damaged, as well as the gasket
between intake manifold and throttle.
Check the cylinder gasket, whether it is bent and damaged.
Check all hoses whether they are ageing and broken.

Poor ignition

Check spark plug applying condition, whether it operates well.
Check cylinder wire, whether there is short or open circuit.
Check the operating condition of ignition coil and distributor.
Check the connecting condition between ignition control and ECU.

Idle motor malfunction

Check idle motor, whether it is too dirty or stuck, clean or replace it when
necessary. Load data stream to confirm idle operation parameter status.

Small valve clearance

Check valve clearance: on 4-cylinder engine, the clearance of intake valve
shall be 0.20±0.05 mm, exhaust valve 0.30±0.05mm. On 3-cylinder engine,
the clearance of intake / exhaust valve shall be 0.20±0.05mm when heating,
0.12±0.04mm in cold condition. Otherwise, shall adjust it.

Improper ignition time

Check ignition advance angle, whether it is normal. In idle condition: on
4-cylinder engine, the advance angle shall be 10°~12° before top dead
center. on 3-cylinder engine, the advance angle shall be 12°±3.75° before top
dead center. Otherwise, shall adjust it.

Tachometer
large vibrates
when engine
surging

Engine mechanical parts

Check exhaust system, whether it is blocked or damaged. Check timing,
whether it is misaligned. Check valve spring, whether it is damaged. Check
camshaft, cylinder head and piston, whether they are malfunction. Check
cylinder pressure, whether it is in normal condition.

4

Engine surging

Fuel fliter blockage

Blocked

Check the injector whether it is blocked or poor

atomized

Clean or replace

Clean or replace

Low fuel pressure

Intake system leaking

Poor ignition

Charcoal canister

Engine valve clearance

Engine ignition timing

Idle motor

Engine mechanical parts

Maintain

Maintain

Maintain or replace

Adjust

Adjust

Check

Clean or replace

Replace

Poor

Low

Leak

Poor

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal