Geely Diagnosis Flow. Manual part — 3

9

No. 005 Idle speed unstable or engine shut-off when opening AC or steering

Malfunction Cause

Solution

Compressor or booster
pump malfunction

AC compressor over load (for example, coolant over filling, tube blocked,
condenser is dirty, and etc.), belt over tensioned, compressor inner stuck, as well
as booster pump inner rotor stuck and results over load.

Intake system abnormal

When intake manifold leaking, repair or replace relevant component. When valve
clearance disalignment, adjust it. When air filter blocking, replace it.

Oil line pressure abnormal

Replace oil pump, when it operates abnormally. Fuel filter blocked, replace it.
Fuel pressure controller operates abnormally, replace it. Oil pump relay poor
contact, maintain or replace it.

AC switch or booster
pump oil pressure sensor
malfunction

When opening AC or steering, ECU doesn't receive loading signal, which results
low idle speed and engine shut-off. Maintain or replace it.

Idle speed controller or
stepping mortor
malfunction

Check stepping motor, whether it is stuck or dirty. Clean or replace it when
necessary.

Injector malfunction

When injector blocked or poor atomized, shall clean the injector, and replace it if
necessary.

Improper ignition timing or
weak jump-spark power

Check ignition timing, coil, wire and spark plug etc. and each connecting part,
whether they are damaged. Maintain or replace them.

ECU malfunction

Check ECU and each connecting part, whether there are damage.

Idle speed
unstable or
engine
shut-off when
openinig AC
or steering

Low engine cylinder
pressure

Disassemble and maintain the engine.

10

Idle speed unstable or engine shut-off when

openinig AC or steering

Compressor or booster pump failure

Intake system abnormal

Oil line pressure abnormal

AC switch or booster pump oil pressure sensor

malfunction

Idle speed controller or stepping mortor malfunction

Injector malfunction

Improper ignition timing or weak jump-spark power

ECU malfunction

Insufficient engine cylinder pressure

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Replace

Check or replace

Check

Replace

Check or replace

Check

Clean or replace

Clean or replace

Adjust or replace

11

No. 006 Engine shuts off intermittently

Malfunction Cause

Solution

Spark plug clearance is
abnormal or tracking

Adjust spark plug clearance: on 4-cylinder engine, 0.8~1.0mm. On
3-cylinder engine, 1.0~1.1mm. Replace the plug when there is current
leaking.

Ignition wire tracking, short or
open circuit

Replace ignition wire.

Fuel pump relay conducting
point burnt

Check relay conducting point, whether it is burnt. Replace it when
necessary.

Improper fuel pressure

Check oil pressure and the atomization of each injector, whether they
are normal. Check oil pump, oil pressure controller and fuel filter when
necessary. As well as clean and replace the injector.

Fuel pollution

Check oil, whether it is polluted or mixed with water.

Ignition coil malfunction

Check ignition coil, whether it is over heat or short circuit. Measure
primary winding, the resistance shall be 0.4~0.6Ω, and secondary
winding, the resistance shall be 11~15kΩ. Otherwise, shall replace
ignition coil.

Canister oil leaking

Check canister, whether it contains gasoline or it is blocked. Replace it
when necessary.

Distributor malfunction

Replace distributor assembly.

Exhaust system blocked

Check 3-way catalytic converter or exhaust pipe, whether it is bent or
blocked. Replace it when necessary.

Improper valve clearance
adjustment

Check the valve clearance of each cylinder, whether the value is too
small. Adjust it to standard value when necessary. For 4-cylinder engine,
the intake valve clearance shall be 0.20±0.05mm, the exhaust valve
clearance shall be 0.30±0.05mm. For 3-cylinder engine, the intake /
exhaust valve clearance shall be 0.20±0.05mm when heating, and
0.12±0.04mm when in cold condition. Otherwise, shall adjust the
clearance.

Crankcase venting device
malfunction

Check PCV valve, whether it is blocked or stuck. Maintain or replace it
when necessary.

Fuel tank inner vacuum

Check fuel tank, whether it contains inner vacuum. Replace tank cover
or canister electromagnetic valve when necessary.

Oxygen sensor malfunction

Check oxygen sensor, whether it is polluted or poisoned. Replace it
when necessary.

Idle speed control valve or
stepping motor operates
abnormal

Check idle speed control valve or stepping motor, whether it is stuck or
operating abnormal. Clean or replace idle speed control valve or
stepping motor when necessary.

Engine shuts off
intermittently
when running at
idle speed

ECU and connecting circuit
malfunction

Check ECU body, whether the heat condition and operating condition
are in according with manufacturer requirements. Replace ECU
assembly when necessary. Check engine computer wire harness
connector, whether it is loose, fix it again when necessary.

12

Engine shuts off intermittently

Improper fuel pressure

Fuel pump relay conducting point burnt

Idle speed control valve or stepping motor is dirty or

stuck

Fuel pollution

Ignition coil malfunction

Canister oil leaking

Exhaust system blocked

Oxygen sensor malfunction

Improper valve clearance

Crankcase venting device malfunction

Fuel tank inner vacuum

Spark plug and ignition wire malfunction

ECU and connecting circuit malfunction

Replace

Check or replace

Check

Replace

Maintain or replace

Check

Replace

Adjust

Replace

Replace

Check or replace

Check or replace

Check or replace

Abnormal

Burnt

Abnormal

Abnormal

Abnormal

Abnormal

Blocked

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal