Geely Diagnosis Flow. Manual part — 10

37

Engine idle speed decreases when activating

head beam or fan

Generator belt loose

Earth lead loose

Generator operates abnormal

Battery open circuit

Idle speed controlling valve or stepping motor

failure

Combined switch short circuit

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

Poor ECU signal

Engine operates abnormal

Check

Clean and replace

Check

Check or replace

Check and replace

Replace

Replace

Adjust

Check

Open circuit

Loose

Poor

Low

Short circuit

Over load

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

38

No. 022 Exhaust pipe blows water

Malfunction Cause

Solution

Water log in silencer

Check silencer inner water log. The tail water exhaust port of
silencer is blocked, and blows large quantity of water when
accelerating. Punch a hole on silencer to drain water.

Throttle body water leak

Maintain or replace throttle body.

Gasket damaged

Maintain cylinder and cylinder head surface, replace gasket.

Crack or blow hole in cylinder head

Check cylinder head, whether there is crack or blow hole in it,
which results coolant flow into cylinder. Remove cylinder head
and inspect the crack in it, by magnaflux. Replace cylinder
head when necessary.

Engine vibration when
idling, with abnormal
noise, and cooling
water is always
polluted.

Crack or blow hole on clinder wall

Check cylinder wall, whether there is crack or blow hole in it,
which results coolant flow into cylinder. Remove cylinder wall
and inspect the crack in it, by magnaflux. Replace cylinder
head when necessary.

Exhaust pipe blows water

Water log in silencer

Throttle body water leak

Gasket damage

Crack or blow hole in cylinder head

Crack or blow hole on clinder wall

Check

Replace

Replace

Replace

Replace

Damage

Water log

Water leak

Crack or blow hole

Crack or blow hole

Normal

Normal

Normal

Normal

39

No. 023 Engine shuts off when accelerating

Malfunction Cause

Solution

Fuel tank lacks of fuel

Fill fuel

Poor fuel quality

Replace with standard fuel

Air filter blocked

Clean or replace air filter

Low intake vacuum

Vacuum sense port of intake pressure sensor is blocked by carbon
deposit. Clean it. Intake vacuum pipe cracked, and results vacuum
decreased, mixture gas rarefied, as well as engine shut-off when
vehicle picking up.

Exhaust system partly blocked

Check 3-way catalytic converter, whether it is dropped or blocked.

Ignition maladjustment

Check fly wheel signal rim, whether it operates correctly. Check
tachospeed sensor, whether it is normal. Check valve timing,
whether it is normal. Check ignition system, whether it contains
ignition miss.

Positive electrode of oxygen sensor

short or open circuit.

Check output voltage of oxygen sensor, in idle condition the value
shall be about 4.5V. Otherwise, replace oxygen sensor.

Fuel pressure decrease when

accelerating

Normal fuel pressure is between 250kPa and 300kPa. Check fuel
pump, fuel filter and fuel pressure controller etc. Replace them
when necessary.

Throttle position sensor short or

open circuit

Check throttle position sensor, whether there is short or open
circuit. Replace it when necessary.

Engine shut-off
when vehicle
picking up

Low cylinder pressure

Check operation of each cylinder, whether it operates normal.
Disassemble and maintain engine when necessary.

40

Engine shuts off when accelerating

Fuel tank lacks of fuel

Poor fuel quality

Air filter blocked

Low intake vaccum

Exhaust system blocked

Ignition maladjustment

Fuel pressure decrease when accelerating

Positive electrode of oxygen sensor short or

open circuit

Low cylinder pressure

Replace

Replace

Check

Check

Check

Replace

Fill

Clean or replace

Check and replace

Blocked

Lack

Poor quality

Low

Blocked

Abnormal

Abnormal

Abnormal

Decrease

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal