Geely Diagnosis Flow. Manual part - 40

Geely Diagnosis Flow. Manual part - 40


157

No.115 Engine not running or slowly running while startup

General malfunction part: 1. battery; 2. startup motor; 3. harness or ignition switch; 4. mechanical
parts of the engine. General diagnosis flowchart:

Serial No. Operation steps

Results

Follow-ups

Yes Next

step

1

Check voltage between two binding posts of battery is around 8-12V
while the engine is started with the multimeter.

No Replace

battery

Yes Next

step

2

With ignition switch at starting position, check binding post of anode of
startup motor is with voltage above 8V with the multimeter.

No

Repair or replace
harness

Yes

Repair or replace
starting motor

3

Remove startup motor, and check its working conditions. Mainly check it
is open circuited or jammed due to poor lubrication.

No Next

step

Yes

Replace for
lubricating oil with
proper grade

4

If malfunction only occurs in winter, check resistance of startup motor is
too large due to improper selection of lubricating oil and gear case oil.

No Next

step

Yes

Check internal
resistance of
engine

5

Check internal mechanical resistance of the engine is too large, causing
startup motor not running or slowly running.

No Diagnosis

help


158

No.116 While startup, engine running, but unable to start

General malfunction part: 1. oil tank without oil; 2. fuel pump; 3. speed sensor; 4. ignition coil; 5.
mechanical part of engine. General diagnosis flowchart:

Serial No. Operation steps

Results

Follow-ups

Yes Next

step

1

Connect fuel pressure gauge (access point is front end of oil sucker of
fuel distribution pipe assembly), and start the engine, and check fuel
pressure is around 350kPa.

No

Repair oil supply
system

Yes Next

step

2

Connect diagnosis instrument of electric injection system and observe
“engine speed”. Start the engine and observe speed signal is output.

No

Repair speed
sensor lines

Yes Next

step

3

Take out line of one cylinder, and connect spark plug, making spark plug
electrode about 5mm away from engine body. Startup the engine and
check there is high pressure spark.

No

Repair ignition
system

Yes

Eliminate
mechanical failure

4

Check pressure of each cylinder of the engine, and observe engine
cylinder is with insufficient pressure.

No Next

step

Yes Diagnosis

help

5

Connect commutator of electric injection system, and open ignition
switch, and check power supply of 12#, 13#, 44#, 45#, ,63# pins are
normal; check bonding of 3#, 51#, 53#, 61#, 80# pins are normal.

No

Repair
corresponding lines


159

No.117 Difficult to start for hot startup

General malfunction part: 1. fuel containing water; 2. fuel pump; 3. cooling liquid temperature
sensor; 4. fuel pressure regulator vacuum pipe; 5. ignition coil.
General diagnosis flowchart:

Serial No. Operation steps

Results

Follow-ups

Yes Next

step

1

Connect fuel pressure gauge (access point is front end of oil sucker of
fuel distribution pipe assembly), and start the engine, and check fuel
pressure is around 350kPa.

No

Repai r oil supply
system

Yes Next

step

2

Take out line of one cylinder, and connect spark plug, making spark plug
electrode about 5mm away from engine body. Startup the engine and
check there is high pressure spark.

No

Repair ignition
system

Yes

Repair lines or
replace sensor

3

Take out connector of cooling liquid temperature sensor, and start the
engine. Observe the engine is successfully started at this point. (or
connect one 300ohm resistance in series at connector of this sensor to
replace cooling liquid temperature sensor and observe the engine is
successfully started at this point.)

No Next

step

Yes

Repair or replace

4

Check fuel pressure regulator vacuum pipe is loosening or air leaking.

No Next

step

Yes Replace

fuel

5

Check fuel condition and observe malfunction is caused just after
refueling.

No Next

step

Yes Diagnosis

help

6

Connect commutator of electric injection system, and open ignition
switch, and check power supply of 12#, 13#, 44#, 45#, ,63# pins are
normal; check bonding of 3#, 51#, 53#, 61#, 80# pins are normal.

No

Repair
corresponding lines


160

No.118 Difficult to start for cold startup

General malfunction part:1. fuel containing water; 2. fuel pump; 3. cooling liquid temperature
sensor; 4. oil injector; 5. ignition coil;
6. throttle valve body and idling speed bypass duct; 7. mechanical parts of engine. General
diagnosis flowchart:

Serial No. Operation steps

Results

Follow-ups

Yes Next

step

1

Connect fuel pressure gauge (access point is front end of oil sucker of
fuel distribution pipe assembly), and start the engine, and check fuel
pressure is around 350kPa.

No

Repai r oil supply
system

Yes Next

step

2

Take out line of one cylinder, and connect spark plug, making spark plug
electrode about 5mm away from engine body. Startup the engine and
check there is high pressure spark.

No

Repair ignition
system

Yes

Repair lines or
replace sensor

3

Take out connector of cooling liquid temperature sensor, and start the
engine. Observe the engine is successfully started at this point. (or
connect one 300ohm resistance in series at connector of this sensor to
replace cooling liquid temperature sensor and observe the engine is
successfully started at this point.)

No Next

step

Yes

Clean throttle valve
and idling speed
duct

4

Step on the throttle lightly, and observe it is easily started.

No Next

step

Yes

Replace
malfunctiony ones

5

Remove oil injector, and check it is leaking or blocked with special
cleaning and analysis instrument.

No Next

step

Yes Replace

fule

6

Check fuel condition and observe malfunction is caused just after
refueling.

No Next

step

Yes

Eliminate
mechanical failure

7

Check pressure of each cylinder of the engine, and observe engine
cylinder is with insufficient pressure.

No Next

step

Yes Diagnosis

help

8

Connect commutator of electric injection system, and open ignition
switch, and check power supply of 12#, 13#, 44#, 45#, ,63# pins are
normal; check bonding of 3#, 51#, 53#, 61#, 80# pins are normal.

No

Repair
corresponding lines

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