Geely Diagnosis Flow. Manual part — 39

153

Yes

To step 4

2

Take out relay of AC compressor, and place ignition switch at “ON”. Check
voltage of power supply terminal of relay, i.e. 30# and 85# pins and cathode
of power source is around 12V.

No Next

step

Yes

Repair or replace
harness

3

Check lines at power supply terminal of relay are opened or shorted to
ground.

No

To step 2

Yes Replace

relay

4

Check voltage of control terminal of AC compressor relay, i.e. between 86#
pin of relay and cathode of power source is around 3.7V with the
multimeter.

No Next

step

Yes

Repair or replace
harness

5

Check lines of control terminal of AC compressor relay, i.e. 86# pin of relay
and 70# pin of ECU are opened.

No Diagnosis

help

No.111 Malfunction code: P0646 "voltage of relay control circuit of AC

compressor too low"

Serial No. Operation steps

Results

Follow-ups

1

Switch on diagnosis instrument and commutator, and place ignition switch
to “OFF”.

Next

step

Yes

To step 4

2

Take out relay of AC compressor, and place ignition switch at “ON”. Check
voltage of power supply terminal of relay, i.e. 30# and 85# pins and cathode
of power source is around 12V.

No Next

step

Yes

Repair or replace
harness

3

Check lines at power supply terminal of relay are opened or shorted to
ground.

No

To step 2

Yes Replace

relay

4

Check voltage of control terminal of AC compressor relay, i.e. between 86#
pin of relay and cathode of power source is around 3.7V with the
multimeter.

No Next

step

154

Yes

Repair or replace
harness

5

Check lines of control terminal of AC compressor relay, i.e. 86# pin of relay
and 70# pin of ECU are shorted to ground.

No Diagnosis

help

No.112 Malfunction code: P0647 "voltage of relay control circuit of AC

compressor too high"

Serial No. Operation steps

Results

Follow-ups

1

Switch on diagnosis instrument and commutator, and place ignition switch
to “OFF”.

Next

step

Yes

To step 4

2

Take out relay of AC compressor, and place ignition switch at “ON”. Check
voltage of power supply terminal of relay, i.e. 30# and 85# pins and cathode
of power source is around 12V.

No Next

step

Yes

Repair or replace
harness

3

Check lines at power supply terminal of relay are opened or shorted to
ground.

No

To step 2

Yes Replace

relay

4

Check voltage of control terminal of AC compressor relay, i.e. between 86#
pin of relay and cathode of power source is around 3.7V with the
multimeter.

No Next

step

Yes

Repair or replace
harness

5

Check lines of control terminal of AC compressor relay, i.e. 86# pin of relay
and 70# pin of ECU are shorted to power source.

No Next

step

Yes Diagnosis

help

6

Check electromagnetic clutch of AC compressor works normally.

No

Repair or replace
electro-magnetic
clutch

155

No.113 Malfunction code: P1508 "voltage of control circuit of idling

speed governor too high"

Serial No. Operation steps

Results

Follow-ups

1

Switch on diagnosis instrument and commutator, and place ignition switch
to “ON”.

Next

step

Yes

To step 4

2

Take out connector of idling speed governor (EWD) of the harness, and
check voltage between 2# pin of this connector and cathode of power
source is around 12V with the multimeter.

No

Next step

Yes

Repair or replace
harness

3

Check lines at power supply terminal of idling speed governor (EWD) are
opened and shorted to ground.

No Next

step

Yes Next

step

4

Check resistance between 1# and 2# pins of idling speed governor (EWD)
is around 17.6Ω under 20 with the multimeter.

℃

No Replace

EWD

Yes

Repair or replace
harness

5

Check lines between 1# pin of connector of idling speed governor (EWD)
and 26# pin of ECU are shorted to power source.

No Diagnosis

help

No.114 Malfunction code: P1651 "malfunction of control circuit of

engine malfunction lamp (SVS)"

Serial No. Operation steps

Results

Follow-ups

1

Switch on diagnosis instrument and commutator, and place ignition switch
to “ON”.

Next

step

Yes Next

step

2

Carry out action testing on malfunction lamp of the engine via “actuator
action testing” of the diagnosis instrument, and observe it is at OFF status
or ON status.

No System

normal

Yes

Repair or replace
harness

3

Check lines at power supply terminal of malfunction lamp of the engine is
open circuited or shorted to ground.

No Next

step

Yes

Repair or replace
harness

4

Check lines between pin of control terminal of malfunction lamp and 28# pin
of ECU is open circuited or shorted to power source or the ground.

No Next

step

Yes Diagnosis

help

5

Check bulb of malfunction lamp is working normally.

No Replace

bulb

156

Diagnosis flowchart of M7 system based on malfunction

Before executing steps of malfunction diagnosis based on malfunction of the engine, carry out
preliminary inspection:
1. Confirm malfunction indicator lamp of the engine is working normally;
2. Check and confirm there is no malfunction information recorded with the malfunction diagnosis
instrument;
3. Confirm malfunction claimed by the vehicle owner exists and confirm conditions why this
malfunction appears. Appearance inspection:
（

1）Check fuel pipe is leaking;

（

2）Check vacuum pipe is broken, kinked, or correctly connected;

（

3）Check inlet pipe is blocked, air leaking, squashed or damaged;

（

4）Check high tension line of ignition system is broken, aging, and ignition sequence is correct;

（

5）Check earthing location of harness is clean, firm;

（

6）Check connector of each sensor, actuator is loosening or poorly contacted. Important: in

case of above-mentioned malfunctions, carry out care and maintenance accordingly, otherwise it
will affect following malfunction diagnosis and maintenance.
Diagnosis help: 1. Confirm the engine is free of malfunction records;
2. Confirm malfunction that is claimed exists;
3. Carry out according to above-mentioned steps and find out nothing unusual;
4. Pay attention to the effect of automobile maintenance, cylinder pressure, mechanical ignition
timing, fuel conditions on the system during inspection;
5. Replace ECU and test it.
If malfunction is eliminated at this time, then malfunction part is in ECU; if malfunction still exists
at this point, replace for original ECU, and repeat the flowchart, and re-inspect.