Geely Diagnosis Flow. Manual part — 5

17

No. 009 Low idle speed during engine heating in cold condition

Malfunction Cause

Solution

Weak ignition spark

Check ignition coil, wire and spark plug, whether they are normal. Adjust or
replace them when necessary.

Crankcase venting
device fails

Check PCV valve, whether it is normal. Replace crankcase venting device when
necessary.

Intake system leaking

Measure vacuum, check the connecting condition of manifold gasket, throttle
gasket, and all vacuum pipes.

Thermostat malfunction

Check thermostat, whether it is leaking, which results warm-up period over
normal value. Replace thermostat when necessary.

Idle speed valve
(steeping motor)
maladjustment

Measure the resistance (UAES idle speed valve 17.6Ω, Delphi motor 53Ω,
Polarsun motor 48±2.4Ω) and voltage of idle motor, whether they are normal.
Check idle speed motor, whether it is dirty and stuck. Maintain and replace it
when necessary.

Improper valve
clearance

Adjust valve clearance: on 4-cylinder engine, the intake valve clearance shall
be 0.20±0.05 mm, the exhaust valve clearance shall be 0.30±0.05mm. On
3-cylinder engine, the intake/exhaust valve clearance shall be 0.20±0.05mm
when warming-up, and 0.12±0.04mm in cold condition.

Low cylinder pressure

Check engine compression ratio and pressure, whether they are in accordance
with standard value. 479Q 9.3: 1/1250kpa/250r/min; 479QA 9.8:
1/1440kpa/250r/min; 481Q 9.4: 1/1360kpa/250r/min; JI376QE 9.5:
1/1225kpa/350r/min; JL378QE 9.5: 1 / 1225kpa/350r/min; Inspemction the
cause, whether valve leaking or piston ring and cylinder wearing. Disassembly
and maintain the engine when necessary.

Water temperature
sensor damaged

Check the resistance of water temperature sensor in cold condition (UAES
2.5kΩ, at 20 ; Delphi 3.56~2.26kΩ, at 20~30 ; Polarsun 2.5kΩ, at 20 ),

℃

℃

℃

whether they are in accordance with standard. Or measure the temperature of
cold vehicle by scanner, whether it is in accordance with actual engine
temperature. Replace coolant fluid temperature sensor when necessary.

Injector malfunction

Check injector, whether it is blocked or stuck. Check atomization and implement
leak test. Clean or replace injector.

Oxygen sensor
malfunction

Check heat-type oxygen sensor heater resistance (UAES 1~6Ω, Delphi 12Ω,
Polarsun 13.2Ω±10%), as well as heater voltage, 12V, and signal voltage,
0.1~0.9V, whether they are in normal range. Check sensor surface, whether it is
dirty and results voltage over normal value, as well as the fuel-air mixture is too
thin.

Ignition timing
maladjustment

Check ignition time and calibrate ignition timing, in idle condition: on 4-cylinder
engine, the ignition advance angle shall be 10°~12° before top dead center. On
3-cylinder engine, the value shall be 12°±3.75° before top dead center.

Low idle speed
during engine
heating in cold
condition

ECU malfunction

Check connecting conditions of ECU and all wires.

18

Low idle speed during engine heating in cold

condition

Weak ignition spark

Crankcase venting device failure

Water temperature sensor damaged

Thermostat failure

Improper valve clearance

Intake system leaking

Ignition timing maladjustment

Low cylinder pressure

Idle speed valve (steeping motor)

maladjustment

Injector failure

Oxygen sensor malfunction

ECU malfunction

Adjust

Replace

Check

Check and replace

Replace

Replace

Replace

Check

Check

Clean and replace

Check

Clean and replace

Abnormal

Abnormal

Abnormal

Abnormal

Low

Abnormal

Abnormal

Abnormal

Abnormal

Damaged

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

19

No. 010 Canister oil leaking

Malfunction Cause

Solution

Check valve damage, on fuel tank

Check the single check valve on fuel tank, whether it is damaged.
Replace fuel tank assembly when necessary.

Fuel tank cover damage

Check the single check valve of fuel tank cover, whether it can open.
Replace fuel tank cover when necessary.

Canister venting (air) pipe blocked

Check the white venting pipe, to air, at the bottom of canister, whether it
is blocked by silt and result oil leaking. Unplug or replace it when
necessary.

Controlling canister malfunction

Check controlling canister inner charcoal and pipe export, whether they
are blocked. Replace them when necessary. Check canister, whether
the mounting position is too low. Adjust the mounting height when
necessary.

Vacuum pipe blocked, on top of
canister

Raise engine speed to 2000r/min, if vacuum pipe suction is low, then
shall check vacuum pipe system.

Canister control valve malfunction

Check canister controlling valve resistance, which shall be 22~30Ω at
20 . Check controlling wire and valve element, whether they are in

℃

normal condition. Maintain and replace them when stuck.

There is fuel
under
vehichle
when
parking, and
the engine
speed is
unstable
when idling.

ECU malfunction

Check ECU and canister electromagnetic valve controlling circuit,
whether they are in normal condition.

Canister oil leaking

Check valve damage, on fuel tank

Fuel tank cover damage

Controlling canister malfunction

Pipe blocked, on top of canister

Canister control valve malfunction

ECU malfunction

Replace

Replace

Replace

Replace

Check

Replace

Abnormal

Damaged

Blocked

Damaged

Damaged

Damaged

Normal

Normal

Normal

Normal

Normal

20

No. 011 Fuel smells in vehicle

Malfunction Cause

Solution

Gas station man-made malfunction

When filling, fuel dropped around tank filling port and cover, then flows
into vehicle. Clean vehicle.

Fuel tank filling port and port cover
leaking

Check or replace fuel tank filling port and cover.

Fuel pipe leak

Check or replace leaking fuel pipe.

Fuel tank cracked and leaking

Check fuel tank, whether it is leaking. Replace it when necessary.

Canister leak

Check canister controlling system and venting system.

Fuel tank inner pressure abnormal

Replace fuel tank, check valve and fuel filling port cover etc.

Controlling canister pipe malfunction

Check canister pipe, whether it is dropped.

Canister controlling valve
malfunction

Check canister controlling valve, whether it is blocked, as well as the
suction capacity, whether it is poor or fails to open.

Fuel pump and fuel sensor mounting
gasket leaking

Check or replace fuel pump and fuel sensor mounting sealing.

Ignition timing maladjustment

Maintain ignition timing, whether it is delayed.

Injector leak

Check sealing of injector and pipe.

Engine operates abnormal

Check engine operation, whether there is unavailable cylinder.

Fuel smells
in vehicle,
when
opening
window, it
smells even
worse

Oxygen sensor

Measure the voltage of sensor, whether it is too low, as well as the
fuel-air ratio, whether it is over normal value.